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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Pillow Demo</title>
<link rel="stylesheet" href="dist/bundle.css">
<style>
img {
border-radius: 33px;
}
</style>
</head>
<body>
<div class="reveal">
<div class="slides">
<!------------------------------------------------------------------------------->
<section>
<div>
<img width="66%" src="img/pillow-logo-light-text.png">
</div>
<h3>Demo</h3>
<p>Presented to SacPy Meetup 10/03/24</p>
<aside class="notes">
<div>Welcome to the Pillow Demo!</div>
<div>My name is Alex. I live in Bethesda, MD, USA.</div>
<div>I created the PIL fork "Pillow" in July of 2010.</div>
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>About This Talk</h3>
<p class="fragment">Pillow: Past, Present and Future</p>
<ul>
<li class="fragment">Pillow created July 31, 2010</li>
<li class="fragment">PIL created June 15, 1995</li>
<li class="fragment">Python created February 20, 1991</li>
</ul>
<aside class="notes">
<div>Pillow 1.0 was released on July 31, 2010.</div>
<div>PIL's 10 year anniversary was June 15, 2005 according to Fredrik on Image SIG.</div>
<div>Python 0.9.0 was published to the alt.sources newsgroup on February 20, 1991.</div>
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>About This Talk</h3>
<p class="fragment">14 years of Pillow, 29 years of PIL 🥳</p>
<ul>
<li class="fragment">This stuff is old</li>
<li class="fragment">
But continuously updated
<ul>
<li class="fragment">
<a target="_blank"
href="https://github.com/python-pillow/Pillow/discussions/8221?converting=1">Python 3 support</a>
</li>
<li class="fragment">
<a target="_blank"
href="https://github.com/python-pillow/Pillow/issues/2625">Added type hints</a>
</li>
<li class="fragment">
<a target="_blank"
href="https://github.com/python-pillow/Pillow/issues/1888">High bit depth multichannel images</a>?
<ul>
<li class="fragment">
<a href="https://github.com/python-pillow/Pillow/pull/8224">https://github.com/python-pillow/Pillow/pull/8224</a>
</li>
<li class="fragment">
<a href="https://github.com/python-pillow/Pillow/pull/8330">https://github.com/python-pillow/Pillow/pull/8330</a>
</li>
</ul>
</li>
</ul>
</li>
</ul>
<aside class="notes">
Check out the tutorial!
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>About This Talk</h3>
<ul>
<li class="fragment">
Based on the <a target="_blank"
href="https://pillow.readthedocs.io/en/latest/handbook/tutorial.html">Handbook Tutorial</a>
<ul>
<li class="fragment">
<a target="_blank"
href="https://github.com/python-pillow/Pillow/issues/7962">https://github.com/python-pillow/Pillow/issues/7962</a>
</li>
<li class="fragment">
<a target="_blank"
href="https://github.com/python-pillow/Pillow/pull/8246">https://github.com/python-pillow/Pillow/pull/8246</a>
</li>
</ul>
</li>
</ul>
<aside class="notes">
Check out the tutorial!
</aside>
</section>
<!------------------------------------------------------------------------------->
<!------------------------------------------------------------------------------->
<section>
<h3>About Me</h3>
<img src="img/sol.gif" width="16%">
<p class="fragment">Me circa 1998 ↑🤔</p>
<ul>
<li class="fragment">Alex</li>
<li class="fragment">
Jeffrey A. Clark <span class="fragment">(↖same thing)</span>
</li>
<li class="fragment">Bachelor of Science Computer Science 1998 Loyola University Maryland</li>
</ul>
<aside class="notes">
We're going to talk about Pillow but first here's a bit about me. Here I am in 1998, three years after the first PIL release.
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>About Me</h3>
<img src="img/slide12.jpg" width="33%">
<p class="fragment">Me circa 2008 ↖(left)🤔</p>
<ul>
<li class="fragment">Python Pillow Creator 2010</li>
<li class="fragment">
PIL fork author <span class="fragment">(↑same thing)</span>
</li>
<li class="fragment">
Tidelift Lifter 2019 <span class="fragment">($$$ for Pillow)</span>
</li>
</ul>
<aside class="notes">
Here I am in 2008, two years before the first Pillow release. In 2010 I forked PIL to create Pillow. I've been paid by Tidelift to work on Pillow since 2019.
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>About Me</h3>
<img src="img/alex-pillow.jpg" width="33%">
<p class="fragment">Me circa 2020</p>
<p class="fragment">
<a href="https://www.youtube.com/watch?v=D0YwZhksDs8" target="_blank">Plone Conference 2020 — State of Pillow</a>
<a href="https://github.com/python-pillow/state-of-pillow/blob/main/state-of-pillow.pdf"
target="_blank">[PDF]</a>
</p>
<ul>
<li class="fragment">
Lifter <span class="fragment">2019</span><span class="fragment"> (actually late 2018)
</li>
<li class="fragment">
Lifter Advocate <span class="fragment">2023</span><span class="fragment">, 2024</span>
</li>
</ul>
<aside class="notes">
Here I am in 2020, one year after Pillow funding began. In addition to being a paid Lifter I'm also a Lifter advocate, which means I advocate on behalf of Tidelift to help "pay the maintainers".
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<img src="img/Tidelift_primary-logo.webp">
<p class="fragment" style="font-size: 200px">❤️</p>
<p class="fragment">Let's pay the maintainers ✨</p>
<aside class="notes">
I love Tidelift, especially their business model which I like to call "RedHat for everything but the kernel." or as Tidelift's Luis Villa calls it the "middle stack", meaning, not the kernel, and not large open source projects that already have funding.
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<img src="img/Tidelift_primary-logo.webp">
<p class="fragment">
Are you an open source maintainer?
<ul>
<li class="fragment">
<a target="_blank" href="https://tidelift.com/about/resources/surveys">Surveys</a>
</li>
<li class="fragment">
<a target="_blank"
href="https://tidelift.com/webinar/top-findings-from-the-2024-tidelift-state-of-the-open-source-maintainer-report">Upcoming webinar</a>
</li>
</ul>
</p>
<aside class="notes">
As it so happens, Tidelift has just published their annual developer survey results.
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Let's talk about Pillow</p>
<p class="fragment">This talk's history</p>
<p class="fragment">04-16-24</p>
<ul>
<li class="fragment">
<a target="_blank"
href="https://github.com/python-pillow/pillow-demo/tree/04-16-24">Code</a>
</li>
<li class="fragment">
<a target="_blank"
href="https://www.meetup.com/dcpython/events/296654956">Event</a>
</li>
<li class="fragment">
<a target="_blank"
href="https://www.youtube.com/watch?v=xVYqh5ElHUU&t=1600s">Video</a>
</li>
</ul>
<p class="fragment">08-16-24</p>
<ul>
<li class="fragment">
<a target="_blank"
href="https://github.com/python-pillow/pillow-demo/tree/04-16-24">Code</a>
</li>
<li class="fragment">
<a target="_blank"
href="https://www.meetup.com/dcpython/events/296654956">Event</a>
</li>
<li class="fragment">
<a target="_blank"
href="https://www.youtube.com/watch?v=xVYqh5ElHUU&t=1600s">Video</a>
</li>
</ul>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Let's talk about Pillow</h3>
<p class="fragment">Code Examples</p>
<ul>
<li class="fragment">
<a target="_blank" href="https://github.com/janbodnar/pillow-examples">https://github.com/janbodnar/pillow-examples</a>
</li>
<li class="fragment">
<a target="_blank"
href="https://realpython.com/image-processing-with-the-python-pillow-library/">https://realpython.com/image-processing-with-the-python-pillow-library/</a>
</li>
<li class="fragment">
<a target="_blank"
href="https://hhsprings.bitbucket.io/docs/programming/examples/python/PIL/">https://hhsprings.bitbucket.io/docs/programming/examples/python/PIL/</a>
</li>
</ul>
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Let's talk about Pillow</p>
<img class="fragment" src="img/screenshot1.png">
<a class="fragment" href="https://github.com/python-pillow/pillow-demo">https://github.com/python-pillow/pillow-demo</a>
<aside class="notes">
Let's talk about Pillow. Most code examples in demo.py. Other examples in modules imported from demo.py.
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #1 Open image and print info</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = Image.open("hopper.ppm")</span>
<span class="fragment">>>> print(im.format, im.size, im.mode)</span>
<span class="fragment">PPM (128, 128) RGB</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #2 Rotate image 90 degrees clockwise (270 degrees counter clockwise)</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = Image.open("hopper.ppm")</span>
<span class="fragment">>>> im = im.rotate(270)</span>
<span class="fragment">>>> im.save("rotated_hopper.jpg")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/rotated_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #3 Convert to jpeg</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = Image.open("hopper.ppm")</span>
<span class="fragment">>>> im.save("hopper.jpg")</span>
<span class="fragment">$ file hopper.jpg</span>
<span class="fragment">hopper.jpg: JPEG image data, JFIF standard 1.01,
aspect ratio, density 1x1, segment length 16, baseline,
precision 8, 128x128, components 3</span>
</code>
</pre>
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #4 Create thumbnails</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = Image.open("hopper.ppm")</span>
<span class="fragment">>>> im.thumbnail([64, 64])</span>
<span class="fragment">>>> im.save("thumbnail_hopper.jpg")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/thumbnail_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #5 Crop image</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = Image.open("hopper.ppm")</span>
<span class="fragment">>>> im = im.crop([0, 0, 64, 64])</span>
<span class="fragment">>>> im.save("cropped_hopper.jpg")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/cropped_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #6 Pasting image</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = Image.open("hopper.ppm")</span>
<span class="fragment">>>> region = region.transpose(Image.Transpose.ROTATE_180)</span>
<span class="fragment">>>> im.paste(region, (0, 0, 64, 64))</span>
<span class="fragment">>>> im.save("pasted_hopper.jpg")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/pasted_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #7 Roll image</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> from roll import roll</span>
<span class="fragment">>>> im = Image.open("hopper.ppm")</span>
<span class="fragment">>>> im = roll(im, 64)
<span class="fragment">>>> im.save("rolled_hopper.jpg")
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/rolled_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #7 roll.py</p>
<pre class="fragment">
<code>
def roll(im, delta):
"""Roll an image sideways."""
xsize, ysize = im.size
delta = delta % xsize
if delta == 0:
return im
part1 = im.crop((0, 0, delta, ysize))
part2 = im.crop((delta, 0, xsize, ysize))
im.paste(part1, (xsize - delta, 0, xsize, ysize))
im.paste(part2, (0, 0, xsize - delta, ysize))
return im
</code>
</pre>
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #8 Merge images</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> hopper = Image.open("hopper.jpg")</span>
<span class="fragment">>>> alex = Image.open("img/alex-pillow.jpg")</span>
<span class="fragment">>>> im = merge(hopper, alex)</span>
<span class="fragment">>>> im.save("merged_hopper.png")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/merged_hopper.png">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #8 Merge images (and resize)</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> hopper = Image.open("hopper.jpg")</span>
<span class="fragment">>>> alex = Image.open("img/alex-pillow.jpg")</span>
<span class="fragment">>>> im = merge(hopper, alex)</span>
<span class="fragment">>>> im.save("merged_resized_hopper.png")</span>
<span class="fragment">>>> im = Image.open("merged_resized_hopper.png")
<span class="fragment">>>> im = im.resize([128, 128])</span>
<span class="fragment">>>> im.save("merged_resized_hopper.png")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/merged_resized_hopper.png">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #9 Split and merge bands</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> r, g, b = im.split()</span>
<span class="fragment">>>> im = Image.merge("RGB", (b, g, r))</span>
<span class="fragment">>>> im.save("rebanded_hopper.jpg")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/rebanded_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #10 Create JPEG thumbnail with resize</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = im.resize([64, 64])
<span class="fragment">>>> im.save("resized_hopper.jpg")
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/resized_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #11 Transpose image left to right</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = im.transpose(Image.Transpose.FLIP_LEFT_RIGHT)
<span class="fragment">>>> im.save("flip_left_right_hopper.jpg")
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/flip_left_right_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #12 Transpose image top to bottom</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = im.transpose(Image.Transpose.FLIP_TOP_BOTTOM)
<span class="fragment">>>> im.save("flip_top_bottom_hopper.jpg")
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/flip_top_bottom_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #13 Rotate image 90 degrees with transpose</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = im.transpose(Image.Transpose.ROTATE_90)</span>
<span class="fragment">>>> im.save("rotated_hopper_90.jpg")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/rotated_hopper_90.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #14 Rotate image 180 degrees with transpose</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = im.transpose(Image.Transpose.ROTATE_180)</span>
<span class="fragment">>>> im.save("rotated_hopper_180.jpg")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/rotated_hopper_180.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #15 Rotate image 270 degrees with transpose</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = im.transpose(Image.Transpose.ROTATE_270)</span>
<span class="fragment">>>> im.save("rotated_hopper_270.jpg")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/rotated_hopper_270.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #16 Relative resize image with contain</p>
<pre class="fragment">
<code>
>>> from PIL import ImageOps
<span class="fragment">>>> ImageOps.contain(im, (100, 150)).save(</span>
<span class="fragment">>>> "contained_hopper.png")</span>
<span class="fragment">$ file contained_hopper.png</span>
<span class="fragment">contained_hopper.png: PNG image data,
100 x 100, 8-bit/color RGB, non-interlaced</span>
</code>
</pre>
<img class="fragment" src="img/contained_hopper.png">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #17 Relative resize image with cover</p>
<pre class="fragment">
<code>
>>> from PIL import ImageOps
<span class="fragment">>>> ImageOps.cover(im, (100, 150)).save("covered_hopper.png")</span>
<span class="fragment">$ file covered_hopper.png</span>
<span class="fragment">covered_hopper.png: PNG image data,
150 x 150, 8-bit/color RGB, non-interlaced</span>
</code>
</pre>
<img class="fragment" src="img/covered_hopper.png">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #18 Relative resize image with fit</p>
<pre class="fragment">
<code>
>>> from PIL import ImageOps
<span class="fragment">>>> ImageOps.fit(im, (100, 150)).save("fitted_hopper.png")</span>
<span class="fragment">$ file fitted_hopper.png</span>
<span class="fragment">fitted_hopper.png: PNG image data,
100 x 150, 8-bit/color RGB, non-interlaced</span>
</code>
</pre>
<img class="fragment" src="img/fitted_hopper.png">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #19 Relative resize image with pad</p>
<pre class="fragment">
<code>
>>> from PIL import ImageOps
<span class="fragment">>>> ImageOps.pad(im, (100, 150), color="#f00").save("padded_hopper.png")</span>
<span class="fragment">$ file padded_hopper.png</span>
<span class="fragment">padded_hopper.png: PNG image data,
100 x 150, 8-bit/color RGB, non-interlaced</span>
</code>
</pre>
<img class="fragment" src="img/padded_hopper.png">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #20 Convert mode</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = Image.open("hopper.ppm")</span>
<span class="fragment">>>> im = im.convert("L")</span>
<span class="fragment">>>> im.save("converted_hopper.jpg")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/converted_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #21 Image enhancement</p>
<pre class="fragment">
<code>
>>> from PIL import ImageFilter
<span class="fragment">>>> im = im.filter(ImageFilter.DETAIL)</span>
<span class="fragment">>>> im.save("enhanced_hopper.jpg")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/enhanced_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #22 Point operations</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> im = im.point(lambda i: i * 20)</span>
<span class="fragment">>>> im.save("transformed_hopper.jpg")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/transformed_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #23 Process bands</p>
<pre class="fragment">
<code>
>>> from PIL import Image
<span class="fragment">>>> source = im.split()</span>
<span class="fragment">>>> r, g, b = 0, 1, 2</span>
<span class="fragment">>>> mask = source[r].point(lambda i: i < 100 and 255)</span>
<span class="fragment">>>> out = source[g].point(lambda i: i * 0.7)</span>
<span class="fragment">>>> source[g].paste(out, None, mask)</span>
<span class="fragment">>>> im = Image.merge(im.mode, source)</span>
<span class="fragment">>>> im.save("masked_hopper.jpg")</span>
<span class="fragment">>>> print("Saved masked hopper!")</span>
</code>
</pre>
<img class="fragment" src="img/masked_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #24 Enhance image</p>
<pre class="fragment">
<code>
>>> from PIL import ImageEnhance
<span class="fragment">>>> im = ImageEnhance.Contrast(im)</span>
<span class="fragment">>>> im = im.enhance(1.3)</span>
<span class="fragment">>>> im.save("contrasted_hopper.jpg")</span>
<span class="fragment">>>> im.show()</span>
</code>
</pre>
<img class="fragment" src="img/contrasted_hopper.jpg">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #25 Image sequences</p>
<pre class="fragment">
<code>
>>> from PIL import ImageSequence
<span class="fragment">>>> im = Image.open("snorkle.gif")</span>
<span class="fragment">>>> i = 1</span>
<span class="fragment">>>> for frame in ImageSequence.Iterator(im):</span>
<span class="fragment">>>> frame.save(f"snorkle_{i}.png")</span>
<span class="fragment">>>> print(f"Saved snorkle frame {i}!")</span>
<span class="fragment">>>> i += 1</span>
</code>
</pre>
<img class="fragment" src="img/snorkle.gif">
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #26 Postscript</p>
<pre class="fragment">
<code>
>>> from PIL import PSDraw
<span class="fragment">>>> title = "hopper"</span>
<span class="fragment">>>> fp = open("postscript_hopper.ps", "wb")</span>
<span class="fragment">>>> ps = PSDraw.PSDraw(fp)</span>
<span class="fragment">>>> ps.begin_document(title)</span>
<span class="fragment">>>> ps.image((0, 0, 128, 128), im, 0)</span>
<span class="fragment">>>> ps.setfont("HelveticaNarrow-Bold", 36)</span>
<span class="fragment">>>> ps.text((0, 0), title)</span>
<span class="fragment">>>> ps.end_document()</span>
<span class="fragment">>>> print("Saved postscript hopper!")</span>
<span class="fragment">convert postscript_hopper.ps postscript_hopper.pdf</span>
</code>
</pre>
</section>
<!------------------------------------------------------------------------------->
<section>
<p>Example #26 Postscript</p>
<img class="fragment" src="img/screenshot7.png">
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>More on reading images</h3>
<p class="fragment">Example #27: Reading from an open file</p>
<pre class="fragment">
<code>
>>> with open("hopper.ppm", "rb") as fp:
<span class="fragment">>>> im = Image.open(fp)</span>
<span class="fragment">>>> print(im)</span>
<span class="fragment"><PIL.PpmImagePlugin.PpmImageFile image
mode=RGB size=128x128 at 0x1055FD940></span>
</code>
</pre>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>More on reading images</h3>
<p class="fragment">Example #28: Reading from binary data</p>
<pre class="fragment">
<code>
>>> buffer = read_image_to_buffer("hopper.ppm")
<span class="fragment">>>> print(type(buffer))</span>
<span class="fragment"><class '_io.BytesIO'></span>
<span class="fragment">>>> im = read_image_from_buffer(buffer)</span>
<span class="fragment">>>> print(im)</span>
<span class="fragment"><PIL.PpmImagePlugin.PpmImageFile image
mode=RGB size=128x128 at 0x1058294C0></span>
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>More on reading images</h3>
<p class="fragment">Example #29: Batch processing</p>
<pre class="fragment">
<code>
>>> import glob
>>> paths = glob.glob("*.png")
<span class="fragment">>>> for path in paths:</span>
<span class="fragment">>>> image = os.path.join(</span>
<span class="fragment">>>> "batch",</span>
<span class="fragment"> "".join([path[:-4], ".jpg"])</span>
<span class="fragment"> )</span>
<span class="fragment">>>> compress_image(path, image)</span>
<span class="fragment">img/batch/covered_hopper.jpg</span>
<span class="fragment">img/batch/screenshot.jpg</span>
<span class="fragment">img/batch/pillow-logo-light-text.jpg</span>
<span class="fragment">…</span>
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>More on reading images</h3>
<p class="fragment">Example #29: Batch processing with pathlib</p>
<pre class="fragment">
<code>
>>> from pathlib import Path
>>> paths = Path(".").glob("*.png")
<span class="fragment">>>> for path in paths:</span>
<span class="fragment">>>> image = os.path.join(</span>
<span class="fragment">>>> "batch",</span>
<span class="fragment"> "".join([path.stem, ".jpg"])</span>
<span class="fragment"> )</span>
<span class="fragment">>>> compress_image(path, image)</span>
<span class="fragment">img/batch/covered_hopper.jpg</span>
<span class="fragment">img/batch/screenshot.jpg</span>
<span class="fragment">img/batch/pillow-logo-light-text.jpg</span>
<span class="fragment">…</span>
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>More on reading images</h3>
<p class="fragment">Example #29: Batch processing output</p>
<pre class="fragment">
<code>
$ ls -1 img/batch<span class="fragment">
contained_hopper.jpg
covered_hopper.jpg
dcpython-logo.jpg
fitted_hopper.jpg
logo.jpg
logo_fancy.jpg
merged_hopper.jpg
merged_resized_hopper.jpg
padded_hopper.jpg
pillow-logo-light-text.jpg
screenshot.jpg
screenshot0.jpg
screenshot1.jpg
screenshot2.jpg
screenshot3.jpg
screenshot4.jpg
screenshot5.jpg
screenshot6.jpg
screenshot7.jpg
snorkle_1.jpg
snorkle_2.jpg
snorkle_3.jpg
</span>
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Controlling the decoder</h3>
<p class="fragment">Example #30: Reading in draft mode</p>
<pre class="fragment">
<code>
>>> with Image.open("hopper.jpg") as im:
<span class="fragment">>>> print("original =", im.mode, im.size)</span>
<span class="fragment">>>> im.draft("L", (100, 100))</span>
<span class="fragment">>>> print("draft =", im.mode, im.size)</span>
<span class="fragment">original = RGB (128, 128)</span>
<span class="fragment">draft = L (128, 128)</span>
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Also check out</h3>
<ul>
<li class="fragment">
<a target="_blank"
href="https://pillow.readthedocs.io/en/stable/handbook/concepts.html">https://pillow.readthedocs.io/en/stable/handbook/concepts.html</a>
</li>
<li class="fragment">
<a target="_blank"
href="https://pillow.readthedocs.io/en/stable/handbook/appendices.html">https://pillow.readthedocs.io/en/stable/handbook/appendices.html</a>
</li>
</ul>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Concepts</h3>
<p class="fragment">Example #31: Bands</p>
<pre class="fragment">
<code>
>>> im = Image.open(os.path.join("img", "hopper.ppm"))
<span class="fragment">>>> print(im.getbands())</span>
<span class="fragment">('R', 'G', 'B')</span>
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Concepts</h3>
<p class="fragment">Example #32: Modes</p>
<pre class="fragment">
<code>
>>> im = Image.open(os.path.join("img", "hopper.ppm"))
<span class="fragment">>>> print(im.mode)</span>
<span class="fragment">RGB</span>
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Concepts</h3>
<p class="fragment">Example #33: Size</p>
<pre class="fragment">
<code>
>>> im = Image.open(os.path.join("img", "hopper.ppm"))
<span class="fragment">>>> print(im.size)</span>
<span class="fragment">(128, 128)</span>
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Concepts</h3>
<p class="fragment">Example #34: Coordinate System</p>
<pre class="fragment">
<code>
>>> import cart
<span class="fragment">Example #34: Writing coordinate_system_example.png!</span>
</code>
</pre>
<img class="fragment" src="img/coordinate_system_example.png" width="33%">
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Concepts</h3>
<p class="fragment">Example #35: Palette</p>
<pre class="fragment">
<code>
>>> import pal
<span class="fragment">Example #35: Writing output_image_with_random_palette.png</span>
</code>
</pre>
<img class="fragment" src="img/output_image_with_random_palette.png">
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Concepts</h3>
<p class="fragment">Example #36: Info</p>
<pre class="fragment">
<code>
>>> im = Image.open(os.path.join("img", "hopper.ppm"))
<span class="fragment">>>> print(im.info)</span>
<span class="fragment">{}</span>
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Concepts</h3>
<p class="fragment">Example #36: Info</p>
<pre class="fragment">
<code>
>>> im = Image.open(os.path.join("img", "alex-pillow.jpg"))
<span class="fragment">>>> print(im.info)</span>
<span class="fragment">{'icc_profile': b'\x00\x00…'
…
b'\x00\x00…',
'jfif': 257,
'jfif_density': (1, 1),
'jfif_unit': 0,
'jfif_version': (1, 1),
'progression': 1,
'progressive': 1}
</span>
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Concepts</h3>
<p class="fragment">Example #37: Transparency</p>
<pre class="fragment">
<code>
import alpha
<span class="fragment">Example #37: Writing transparent_image.png!</span>
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Concepts</h3>
<p class="fragment">Example #38: Orientation</p>
<pre class="fragment">
<code>
raise NotImplementedError
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Concepts</h3>
<p class="fragment">Example #39: Filters</p>
<pre class="fragment">
<code>
raise NotImplementedError
</code>
</pre>
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Logos</h3>
<p class="fragment">Example #40: Logo</p>
<pre class="fragment">
<code>
import logo
<span class="fragment">Example #40: Writing logo.png!</span>
</code>
</pre>
<img class="fragment" src="img/logo.png">
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h3>Logos</h3>
<p class="fragment">Example #41: Fancy Logo</p>
<pre class="fragment">
<code>
import logo_fancy
<span class="fragment">Example #41: Writing logo_fancy.png!</span>
</code>
</pre>
<img class="fragment" src="img/logo_fancy.png">
<aside class="notes">
</aside>
</section>
<!------------------------------------------------------------------------------->
<section>
<h4>
Thank you! <span class="fragment">👋</span>
</h4>
<ul>
<li class="fragment">
<a target="_blank" href="https://github.com/aclark4life">https://github.com/aclark4life</a>
</li>
<li class="fragment">
<a target="_blank" href="https://github.com/python-pillow">https://github.com/python-pillow</a>
</li>
</ul>
<aside class="notes">
</aside>
</section>