Getting a histogram

[JDlugosz]

I ran identify on a file and it gave me a long listing including a histogram. This just happens to be what I was interested in! I don't recall the "--read-users-mind" option! But how did it know? And more to the point, how do I get such a histogram on other files, which it doesn't seem to do on its own? I can't find an option for that in the main command reference nor in the docs for identify.

--John

[magick]

The identify program returns a histogram if the image has 1024 unique colors or less. There is currently no option to force a histogram if the image has more than 1024 colors other than modifying the ImageMagick source.

[JDlugosz]

I see. So a small patch of 700 pixels of course had less than 1024 unique colors, and will always generate one. That is good to know for my immediate purpose. Thank you.

--John

[fmw42]

In case you want a graph see http://www.imagemagick.org/Usage/files/#histogram

or see my histog script at http://www.fmwconcepts.com/imagemagick/index.html

[anthony]

the IM examples section also details how to get the histogram form the histogram: output image comment, which is always generated!