Legacy ImageMagick Discussions Archive

Hello,

I am new to this board. I searched for an answer but I didn't find any.

I use convert to put some text into pictures. Is there any way to determine the brightness and/or the colour within the targeted area of the picture, so that the colour of the text can be set appropriately?

Thanks in advance.

One method would be to crop the area of an image you want the details for, resize it smaller, and use -identify.

How you get the information from -identify would depend on what you were using e.g. command line, php Perl etc.

Bonzo wrote:One method would be to crop the area of an image you want the details for, resize it smaller, and use -identify.

That sounds promissing.

How you get the information from -identify would depend on what you were using e.g. command line, php Perl etc.

I want to do this in a shell script (thus: command line) on Linux.

Can you tell me where I can find more information about this? Are there any examples available?

Wolfgang wrote: I want to do this in a shell script (thus: command line) on Linux.

Can you tell me where I can find more information about this? Are there any examples available?

You can take a look at this lots of shell scripts. I'm almost sure you'll find how to get the return of identify: http://www.fmwconcepts.com/imagemagick/index.php

use

convert imagename.suffix[widthxheight+xoffset+yoffset] -verbose info:

See:
http://www.imagemagick.org/script/comma ... essing.php
http://www.imagemagick.org/Usage/files/#info
http://www.imagemagick.org/Usage/scripts/
http://www.cit.gu.edu.au/~anthony/info/ ... ript.hints

For brightness convert it to gray scale, and for outputing colors the txt: output is simplier