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I guess your best bit is the radio between histogram and number of pixel. A cartoon-line image trend to have less number of color then the real-life one. You can use <pre><code>COLORS=`convert picture.jpg -format %c histogram:info:- | wc -l`</code></pre> to count how many colors the picture have. And use a command like: <pre><code>WIDTH=`jpeginfo picture.jpg | sed -r "s/.* ([0-9]+) x.*/\1/"`</code></pre> and <pre><code>HEIGHT=`jpeginfo picture.jpg | sed -r 's/.*x ([0-9]+) .*/\1/'`</code></pre> to extract width and height. Then use this command to find the ratio: <code>echo $WIDTH $HEIGHT $COLORS | awk '{ print $3/($1 * $2);}'</code> Then it is up to you to define what ratio is qualified as cartoon-like and what is not. For Cartoon-like, the ratio is mostly lower than the real-life one. Just a thought. EDIT: I just saw your comment that you don't want to know how just an exiting one. So just ignore my answer then. EDIT 2: I modify it a bit to make it easier to see. NOTE 1: You should notice that I swap the ratio as the number of pixels is always much bigger than the number of colors so the previous program results in a lower number. That is why you can hardly distinguish them. NOTE2: I also change from "jpeginfo" to "identity" as <code>jpeginfo</code> can only do jpg and it is not a part of ImageMagick. ~/test/CheckCartoon.sh <pre><code>#!/bin/sh IMAGE=$1 COLORS=<code>convert $IMAGE -format %c histogram:info:- | wc -l</code> WIDTH=<code>identify $IMAGE | sed -r "s/.* ([0-9]+)x[0-9]+ .*/\1/"</code> HEIGHT=<code>identify $IMAGE | sed -r 's/.* [0-9]+x([0-9]+) .*/\1/'</code> RATIO=<code>echo $WIDTH $HEIGHT $COLORS | awk '{ print ($1 * $2)/$3;}'</code> echo $RATIO | awk '{ printf "%020.5f",$1 }' </pre></code> ~/test/CheckAll.sh <pre><code>#!/bin/sh cd images FILES=<code>ls</code> for FILE in $FILES; do IsIMAGE=<code>identify $FILE 2>&1 | grep " no decode delegate " | grep -o "no"</code> if [ "$IsIMAGE" = "no" ]; then continue; fi <pre><code>IsIMAGE=`identify $FILE 2>&1 | grep " Improper image header " | grep -o "Improper"` if [ "$IsIMAGE" = "Improper" ]; then continue; fi echo `.././CheckCartoon.sh $FILE` $FILE </code></pre> done cd .. </pre></code> Now for testing you copy files here. Pic 1: <a href="http://dl.getdropbox.com/u/1961549/StackOverflow/SO1518347/Cartoon-01.jpg" rel="noreferrer">~/test/images/Cartoon-01.jpg</a> Pic 2: <a href="http://dl.getdropbox.com/u/1961549/StackOverflow/SO1518347/Cartoon-02.png" rel="noreferrer">~/test/images/Cartoon-02.png</a> Pic 3: <a href="http://dl.getdropbox.com/u/1961549/StackOverflow/SO1518347/Cartoon-03.gif" rel="noreferrer">~/test/images/Cartoon-03.gif</a> Pic 4: <a href="http://dl.getdropbox.com/u/1961549/StackOverflow/SO1518347/Real-01.jpg" rel="noreferrer">~/test/images/Real-01.jpg</a> Pic 5: <a href="http://dl.getdropbox.com/u/1961549/StackOverflow/SO1518347/Real-02.jpg" rel="noreferrer">~/test/images/Real-02.jpg</a> Pic 6: <a href="http://dl.getdropbox.com/u/1961549/StackOverflow/SO1518347/Real-03.jpg" rel="noreferrer">~/test/images/Real-03.jpg</a> <a href="http://dl.getdropbox.com/u/1961549/StackOverflow/SO1518347/Images.png" rel="noreferrer">http://dl.getdropbox.com/u/1961549/StackOverflow/SO1518347/Images.png</a> Then I run <code>./CheckAll.sh | sort</code> (in <code>test</code> folder). Here is want I got. <pre><code>00000000000003.31362 Real-03.jpg 00000000000004.61574 Real-02.jpg 00000000000009.89920 Cartoon-01.jpg 00000000000013.05870 Real-01.jpg 00000000000020.55470 Cartoon-03.gif 00000000000032.21900 Cartoon-02.png </code></pre> As you can see the result is generally good. You can use number like 15 as a separation. <code>Cartoon-01.jpg</code> is a drawing but it looks like a quite realistic one so it may be easily confused. Also <code>Real-01.jpg</code> is a picture of my girlfriend standing in front of an ocean so the number of colors is less than usual. This come to no surprise why the confusion happens. What I show you here is still a raw theory. If you really want a conclusive indication you may have to find number of metrics and compare them. For example, the degree of local contrast. Hope this will helps.
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