Re: [Lcms-user] First steps and some questions

[Marti M. <mar...@li...>]

Hi Andreas,

I have tested your image with PS CS4 and get 1 digital count of 
deviation of PhotoShop, which is due to the way different CMM do 
rounding. I can see no differences in color.

Could you please detail the steps you follow to get different results?

Thanks
Marti.


El 27/09/2012 19:37, Andreas Rettig escribió:
> Hello,
>
> I'm trying to make my first steps with LCMS and build a very simple 
> application to get familiar with everything.
> All I want to do is transform a RGB-Jpeg from a special input profile 
> to sRGB and produce the same results I get when I do exactly the same 
> in Photoshop.
>
> I'm using that image for testing with its embedded ICC profile as 
> Input profile:
>
> http://www.colormanagement.org/download_files/basICColor_CM-Ampel.jpg
>
> Then I do a simple transformation from ampel.icc -> sRGB.icc, with 
> different intents.
> The results are always a little different from what I can produce in 
> Photoshop (using the same profiles and the same intent).
>
> The traffic light is green after the transformation, which shows me 
> that it roughly works - but I expect to get exactly the same result.
>
> The same happens in Gimp - it's always a little different from what I 
> get through lcms (I saved the results to a file and checked RGB-Values).
> Especially these grids at the borders have very different colors.
>
> Sourcecode is more or less from the examples, nothing special. 
> Profiles are the exactly the same in lcms and Photoshop.
>
> Regards
> Andreas
>
>
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