Dirk, As you have found out when doing color profiles for a device everything in the color processing chain matters and has an impact on the resulting profile. A different light source or a light source adjusted differently will change the profile. As a photographer I do not expect my day light camera profiles to work with photos that were shot using tungsten light. So I have profiles for my camera for each type of light that I might shot with as well as for each film type. On some occasions I may shot a custom color target for a specific shoot because I am not sure of the lighting. So there is no easy answer as you can not reasonably expect a profile that is created using one device to work perfectly for another similar device. Let alone for a similar device with the light adjusted differently.
This all boils down to having a consistant workflow so that you can reproduce the same results consistently. Since my situation is such that I only have to deal with my personal workflow this is not a big issue. I understand how important this is and I always follow a consistant routine so that my results are reproducible. It sounds like you are dealing with others that may need training to understand how this works and how their workflow influences the results they get. In addition it may require that you have a number of profiles that are correct for different devices and conditions. Hal On Monday 28 February 2005 01:22 pm, Dirk Str�ker wrote: > Am Montag, 28. Februar 2005 22:18 schrieb Dirk Str�ker: > > Hi everybody, > > > > I have a problem, which might is simple to solve, but in the moment I'm > > a bit confused and can't find a simple answer. > > Before I explain my problem I will give a short description of my setup. > > I'm working with a CCD-camera on a microscope. The color quality of the > > system was very bad, so I did some research, found ICC-profiles, color > > management...and so on (I learned a lot in the past weeks ;-) ). > > We bought software from Gretag MacBeth to create profiles for the cameras > > and we were pretty impressed over the results. After that we found > > "littleCMS" and tried to use it to achieve the improved color quality > > directly, which worked fine. > > The problem is, that it is a common technique, to make a so called "white > > balance" on the "illumination", the yellowish ligth of the tungsten > > halogen lamp should be white or gray (R=G=B). I understood the ICC > > color-management-technique in that way, that this is normally done by the > > chromatic adaption tag (often the "Bradford matrix"). This is matrix is > > calculated while creating the profile. > > But not every individual microscope lamp is the same. Some people dim the > > lamp, or the lamp is older... but everyone wants to make the pure lamp > > light gray. > > How can I do this > > Oops, I wasn't ready. > > Should I use "cmsCreateRGBProfile" and make a "transform" with the "normal" > camera profile + the new RGBProfile? > > Maybe there is a simple solution and I'm just to blind to see... > > I hope my explanations weren't to confusing ;-) > > > > Dirk Str�ker > > > ------------------------------------------------------- > SF email is sponsored by - The IT Product Guide > Read honest & candid reviews on hundreds of IT Products from real users. > Discover which products truly live up to the hype. Start reading now. > http://ads.osdn.com/?ad_ide95&alloc_id396&op�k > _______________________________________________ > Lcms-user mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/lcms-user
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