blocks|key|126364|text|找到一种允许未压缩的RGBA的图像格式，转换这两个文件，并比较输出。可能是这样的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|126365|$+convert+a.png+a.rgba
$+convert+b.png+b.rgba
$+cmp+{a,b}.rgba
a.rgba+b.rgba+differ:+byte+1,+line+1|code-block|syntax|javascript|126366|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Find an image format which allows uncompressed RGBA, convert both files, and compare the output. Maybe something like this:

<pre><code>$ convert a.png a.rgba
$ convert b.png b.rgba
$ cmp {a,b}.rgba
a.rgba b.rgba differ: byte 1, line 1
</code></pre>

blocks|key|1270064|text|使用ImageMagick和grep的另一种方式|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1270065|compare+-compose+src+-highlight-color+"#FF0000FF"+-lowlight-color+"#00000000"+a.png+b.png+delta.png

convert+delta.png+-define+histograme:unique-colors=true+-format+%25c+histogram:info:-+>+histogram.info

if+grep+--quiet+"#FF0000+red"+histogram.info+:+then
+++echo+"different"
else
+++echo+"same"
fi|code-block|syntax|javascript|1270066|虽然这种方法依赖于ImageMagick是installed，并且比cmp更重，但它可能更容易扩展，以允许容错等。|offset|length|style|BOLD|1270067|提示|1270068|测试ImageMagick是否已经安装，display+-version是一种快速的方法。|CODE|1270069|如果您希望避免写入磁盘，也可以将这些命令通过管道连接在一起。|1270070|entityMap|0|LINK|mutability|MUTABLE|url|https://imagemagick.org/script/compare.php|1|https://imagemagick.org/script/install-source.php^0|0|0|Y|3|9|B|0|L|9|1|0|0|2|0|K|G|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|15|8|@$I|16|J|17|K|L]]|9|@$I|18|J|19|1|1A]|$I|1B|J|1C|1|1D]]|A|$]]|$1|M|3|N|5|6|7|1E|8|@$I|1F|J|1G|K|L]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1H|8|@$I|1I|J|1J|K|Q]]|9|@]|A|$]]|$1|R|3|S|5|6|7|1K|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]|11|$5|W|X|Y|A|$Z|12]]]]

<h1>another way using ImageMagick and grep</h1>
<pre><code>compare -compose src -highlight-color &quot;#FF0000FF&quot; -lowlight-color &quot;#00000000&quot; a.png b.png delta.png

convert delta.png -define histograme:unique-colors=true -format %c histogram:info:- &gt; histogram.info

if grep --quiet &quot;#FF0000 red&quot; histogram.info : then
 echo &quot;different&quot;
else
 echo &quot;same&quot;
fi
</code></pre>
while this methodology relies on <a href="https://imagemagick.org/script/compare.php" rel="nofollow noreferrer">ImageMagick</a> being <a href="https://imagemagick.org/script/install-source.php" rel="nofollow noreferrer">installed</a>, and is heavier than cmp it may be easier to expand to allow for tolerance etc...
TIPS 
<code>display -version</code> is a quick way to test if ImageMagick is already installed.
These commands could also be piped together if you want to avoid writing to disk.

blocks|key|1265569|text|您不应使用ImageMagick+compare中的退出代码。也就是说，compare函数已成功退出，没有任何错误。您想要报告来自比较的AE度量，它将告诉您有多少像素不同。或者使用一些其他度量，如MAE或RMSE。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1265570|compare+-metric+AE+image1+image2+null:|code-block|syntax|javascript|1265571|这将向终端返回一个值，即计数。|1265572|例如：|1265573|compare+-metric+AE+lena.png+lena.jpg+null:
65100|1265574|65100像素是不同的|1265575|您可以将其返回给变量，如下所示：|1265576|var=`compare+-metric+AE+lena.png+lena.jpg+null:+2>&1`
echo+$var
65100|1265577|ImageMagick将其输出写入标准错误，这就是我添加2>&1的原因|1265578|看见|1265579|https://imagemagick.org/script/compare.php+https://imagemagick.org/Usage/compare/|offset|length|1265580|entityMap|0|LINK|mutability|MUTABLE|url|https://imagemagick.org/script/compare.php|1|https://imagemagick.org/Usage/compare/^0|0|0|0|0|0|0|0|0|0|0|0|16|0|17|12|1|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1B|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1C|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|1D|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|1E|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|1F|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1G|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|1H|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|1I|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1J|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1K|8|@]|9|@$Y|1L|Z|1M|1|1N]|$Y|1O|Z|1P|1|1Q]]|A|$]]|$1|10|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]]|11|$12|$5|13|14|15|A|$16|17]]|18|$5|13|14|15|A|$16|19]]]]

You should not use the exit code from ImageMagick compare. All that says is the compare function exited successfully with no error. You want to report the AE metric from compare, which will tell you how many pixels are different. Or use some other metric such MAE or RMSE.

<pre><code>compare -metric AE image1 image2 null:
</code></pre>

 
That will return a value to the terminal, which is the count.

For example:

<pre><code>compare -metric AE lena.png lena.jpg null:
65100
</code></pre>

 65100 pixels are different

You can return that to a variable as:

<pre><code>var=`compare -metric AE lena.png lena.jpg null: 2&gt;&amp;1`
echo $var
65100
</code></pre>

 
ImageMagick writes its output to stderr, so that is why I added 2>&amp;1

See 

<a href="https://imagemagick.org/script/compare.php" rel="nofollow noreferrer">https://imagemagick.org/script/compare.php</a>
<a href="https://imagemagick.org/Usage/compare/" rel="nofollow noreferrer">https://imagemagick.org/Usage/compare/</a>

In a shell script, I would like to check whether two PNG images are different in the sense that either the images have different sizes or at least one pixel of one image has a different RGBA than the corresponding pixel of the other image.

Hashing the two image files will not work because the images could be compressed differently or have a different comment or perhaps two pixels are fully transparent but the RGB components differ, etc.

I know how to check whether the file sizes are different using ImageMagick's <code>convert</code> utility. As far as comparing the pixel values, I thought of using ImageMagick's <code>compare</code> utility, but the exit code is always 0 if the command was successfully processed: <a href="http://www.imagemagick.org/discourse-server/viewtopic.php?f=3&amp;t=22451" rel="nofollow">http://www.imagemagick.org/discourse-server/viewtopic.php?f=3&amp;t=22451</a>

What command line test can be used to compare the pixels of two PNG images for equality? Or perhaps there is a way to use <code>compare</code> after all?

Shell test for "images are different"?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在shell脚本中，我想检查两个PNG图像是否不同，因为这两个图像的大小不同，或者一个图像的至少一个像素与另一个图像的相应像素具有不同的RGBA。散列两个图像文件将不起作用，因为图像可能以不同的方式压缩，或者具有不同的注释，或者可能两个像素是完全透明的，但RGB分量不同，等等。我知道如何使用ImageMagick的co...

问“图像不同”的Shell测试？
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