" DIFF"使用ImageMagick强调的图像 [英] "Diff" an image using ImageMagick with emphasis

问题描述

跟进

更像这样的东西

好像我只是在堆栈中遗漏了一些可以制作的东西这项工作。


convert'（'file1.png -flatten -grayscale Rec709Luminance'）'\
'（'file2 .png -flatten -grayscale Rec709Luminance'）'\
...在这里？ ...
'（' - clone 0-1 -compose darken -composite'）'\
......还是在这里？ ...
-channel RGB -combine diff.png


我也可以将它作为单独的命令运行不需要很快，大部分都将脱机运行。

我也试过在这里研究这种技术（特别是缩略图缩放如何在像素扩展时为你提供我想要的效果）但是这段代码使用的是库而不是ImageMagick命令行工具。第248行=>使红色尽可能可见

并且比较泵出这个（红色变化，你几乎看不到）

感谢您的帮助

解决方案

你可以在Imagemagick中使用-morphology dilate来增加大小o f红色区域。例如，使用两种形式：

 转换JW0wZ.png 1nHWT.png -compose difference -composite -morphology dilate disk：10 + level-colors black，red result.gif 
  

或者更好

 转换JW0wZ.png 1nHWT.png -compose difference -composite -morphology dilate disk：10 -alpha copy -backg圆形红色-alpha形状result2.png 
  

更新2：以下是如何将50％黄色标记覆盖到两张原件上。根据需要更改值。我创造了一个差异图像并扩大了白色。然后我创建了一个50％的黄色图像。然后我使用差异图像作为掩模将每个原件与黄色合成。请参见

要查看这个，如果在Unix上并且有X1 1安装，你可以做

  animate -delay 20 -resize 50％1.png 2.png 
  

Follow up on "Diff" an image using ImageMagick

When you are working with forms (as opposed to images), the changes are very hard to see with this technique. I wanted to show some type of yellow highlight maybe 10-20 pixels "bigger" (padding) around the actual pixels that changed.

So instead of just this

Something more like this

It seems like I am just missing something here in the stack that can make this work.

convert '(' file1.png -flatten -grayscale Rec709Luminance ')' \ '(' file2.png -flatten -grayscale Rec709Luminance ')' \ ... here ? ... '(' -clone 0-1 -compose darken -composite ')' \ ... or here ? ... -channel RGB -combine diff.png

I can also run this as separate commands and does not need to be fast, most of this is going to be run offline.

I also tried studying the technique here (specifically how the thumbnail scaling gives you the effect I want as the pixels get expanded) but this code is using the library instead of the ImageMagick command line tools. Line 248 => "make the red as visible as possible"

https://github.com/vslavik/diff-pdf/blob/master/diff-pdf.cpp#L218

An example form is the standard W-9. I made 2 subtle changes

• PART II .. moved the 2. left about 2 pixels
• PART II .. on 4., moved word is to the right 2 pixels

and the compare pumps out this (changes in red that you can barely see)

Thank you for any help

解决方案

You can use -morphology dilate in Imagemagick to increase the size of the red areas. For example, using your two forms:

convert JW0wZ.png 1nHWT.png -compose difference -composite -morphology dilate disk:10 +level-colors black,red result.gif

UPDATE:

If you want the background transparent, then try

convert JW0wZ.png 1nHWT.png -compose difference -composite -morphology dilate disk:10 +level-colors "black,red" -fuzz 20% -transparent black result.png

Or better

convert JW0wZ.png 1nHWT.png -compose difference -composite -morphology dilate disk:10 -alpha copy -background red -alpha shape result2.png

Update 2: Here is how to overlay a 50% yellow marking onto you two originals. Change the value as desired. I create a difference image and dilate the white. Then I create a 50% yellow image. Then I composite each of the originals with the yellow using the difference image as a mask. See https://www.imagemagick.org/Usage/compose/#compose

convert JW0wZ.png 1nHWT.png \
\( -clone 0,1 -compose difference -composite -morphology dilate disk:10 \) \
\( -clone 0 -fill yellow -colorize 100 -channel a -evaluate set 50% +channel \) \
\( -clone 0,3,2 -compose over -composite +write 1.png \) \
\( -clone 1,3,2 -compose over -composite +write 2.png \) \
null:

To view this, if on Unix and have X11 installed, you can do

animate -delay 20 -resize 50% 1.png 2.png

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