Merge branch '295_MagickAutoThresholdImage' into im-7

# Conflicts:
#	imagick/magick_wand_image.go

Dockerfile

@@ -21,7 +21,7 @@ RUN apt-get update \
     && rm -rf /var/lib/apt/lists/*
 
 ARG IMAGEMAGICK_PROJECT=ImageMagick
-ARG IMAGEMAGICK_VERSION=7.0.8-11
+ARG IMAGEMAGICK_VERSION=7.0.8-41
 ENV IMAGEMAGICK_VERSION=$IMAGEMAGICK_VERSION
 
 RUN cd && \

README.md

@@ -8,9 +8,9 @@ Go Imagick is a Go bind to ImageMagick's MagickWand C API.
 We support two compatibility branches:
 
 ```
-im-7   (tag v3.x.x): 7.x     <= ImageMagick <= 7.x
-master (tag v2.x.x): 6.9.1-7 <= ImageMagick <= 6.9.9-35
-legacy (tag v1.x.x): 6.7.x   <= ImageMagick <= 6.8.9-10
+im-7   (tag v3.x.x): 7.0.8-41 <= ImageMagick <= 7.x
+master (tag v2.x.x): 6.9.1-7  <= ImageMagick <= 6.9.9-35
+legacy (tag v1.x.x): 6.7.x    <= ImageMagick <= 6.8.9-10
 ```
 
 They map, respectively, through gopkg.in:

imagick/magick_wand_image.go

@@ -2289,6 +2289,17 @@ func (mw *MagickWand) AutoOrientImage() error {
 	return mw.getLastErrorIfFailed(ok)
 }
 
+// AutoThresholdImage automatically performs image thresholding
+// dependent on which method you specify.
+//
+// A description of each parameter follows:
+//
+//	method: choose from Kapur, OTSU, or Triangle.
+func (mw *MagickWand) AutoThresholdImage(method AutoThresholdMethodType) error {
+	ok := C.MagickAutoThresholdImage(mw.mw, C.AutoThresholdMethod(method))
+	return mw.getLastErrorIfFailed(ok)
+}
+
 // SetImagePage Sets the page geometry of the image.
 func (mw *MagickWand) SetImagePage(width, height uint, x, y int) error {
 	ok := C.MagickSetImagePage(mw.mw, C.size_t(width), C.size_t(height), C.ssize_t(x), C.ssize_t(y))

imagick/threshold_type.go

@@ -0,0 +1,19 @@
+// Copyright 2013 Herbert G. Fischer. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package imagick
+
+/*
+#include <MagickWand/MagickWand.h>
+*/
+import "C"
+
+type AutoThresholdMethodType int
+
+const (
+	AUTO_THRESHOLD_METHOD_UNDEFINED AutoThresholdMethodType = C.UndefinedThresholdMethod
+	AUTO_THRESHOLD_METHOD_KAPUR     AutoThresholdMethodType = C.KapurThresholdMethod
+	AUTO_THRESHOLD_METHOD_OTSU      AutoThresholdMethodType = C.OTSUThresholdMethod
+	AUTO_THRESHOLD_METHOD_TRIANGLE  AutoThresholdMethodType = C.TriangleThresholdMethod
+)