minimal RGB value differences

[Asterixx]

Hello,

I notice small differences in the RGB values about an *.ai file, whether I open it in Illustrator or CorelDraw.

Yes this is now a huge door opening the color management world :).

But I try to keep it simple.

Any (not only one) file that opens with different colors in Illustrator and CorelDraw, for example RGB 224-115-75 becomes 223-114-75. Actually not a huge problem, but I wonder why. Same is true for CMYK.

The color profile in the *.ai is normal sRGB, the color in CorelDraw is the same.

Also the CMYK profiles are the same.

Is there any other option that could lead to such a minimal difference, or do I have to live with it?

I ask especially as I work a lot with names colors and would like to see the color names in both programs.

thank you.

[Monika Gause]

The color engines are most probably different and thus working differently.

[Asterixx]

Thank you - is this something I can't change - or is this because of some rendering intent, color engine (WCS, ICM) and so on. I tried many settings, some colors are exactly the same, some are not.

Probably most people would not care about this as they don't use color names and accept that CorelDraw and Illustrator have such marginal differences?

[Ton Frederiks]

It is probably caused by rounding. You can see the same kind of small differences in Illustrator when you create an object with a cmyk color and paste it in an RGB document and look at the color panel set to RGB values.

There will be some conversion when taking colors from Corel into Illustrator. Illustrator uses ACE (Adobe Color Engine) while Corel uses ???

[Asterixx]

Yes, thank you. I am not a developer but I always wonder in such cases why the cases are not the same when they are already nearly the same :). I tried all I could about the color engine. Yes, Adobe uses ACE, but I can also choose ICM in Illustrator, and ICM in Corel Draw. In CorelDraw you can choose ICM, WCS and LCMS.

But perhaps I can at least learn: Has the rendering intent and the black point compensation anything to do here, or is this only about the color engine (and rounding as you say).

It's interesting that I can save a file in CorelDraw as *.ai and open it in Illustrator, and the colors that illustrator shows are exactly the same, this is correct. But when I save this same *.ai and open it back in CorelDraw, the values have changed :).

[Ton Frederiks]

As you mentioned the different color engines, rendering intents, black point compensation and add some rounding to the mix. These are complicated calculations and it will be hard to figure out which one (or which combination) causes the color value difference.