Legacy ImageMagick Discussions Archive

I am confused:

by snibgo » 2015-11-16T18:36:28+01:00:
> Many of the effect filters (and colours in general) assume the input is sRGB, so you should convert to sRGB first.

by snibgo » 2015-11-18T19:48:40+01:00:
> No. Many filters assume the channels represent red, green and blue, but not that the ...

You got me wrong. I was not thinking about a full "do everything automatic for me" functionality. But if in fact, many filters seem rely on srgb. It would be quite convinient (and possible, or not?!) to let ImageMagick do the neccessary conversions by itself?

Or at least, bring up a sensible ...

I still dont get why ImageMagick has no automatics for converting to sRGB and back if needed. So i will have to implement that by myself.

Thanks for your enlightening answers!

Thanks for your explanation! My thought always was, to convert colorspaces only if needed. In this case, we just want to print a given cmyk image - just with that sepia-tone applied. But if understand correctly, there is no other choice but converting to srgb before to get reasonable results. That ...

If i use the sepia filter on the following image:

http://ops42.ms-visucom.de/temp/heart_test_cmyk.jpg

while using the following command:

convert heart_test_cmyk.jpg -sepia-tone 80% heart_test_cmyk_sepia.jpg

the resulting image gets a blue tone:

http://ops42.ms-visucom.de/temp/heart_test_cmyk ...