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Monitor Profile in C1 Pro

Claudio Forti
Hi, C1 Pro support matrix color profile or LTU color profile as Monitor profile in Color Management Settings?

Thanks

Claudio
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  • thowi
    [quote="Claudio" wrote:
    Hi, C1 Pro support matrix color profile or LTU color profile as Monitor profile in Color Management Settings?
    Both matrix TRC and LUT profiles.
    But if you use Photoshop too, you should create a matrix Profile (beause of a Photoshop Bug with LUT display profiles; only in case of a very inaccurate display that needs heavy correction by calibration software you should think about creating a LUT Profile).
    Best Regards.
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  • Claudio Forti
    Thanks thowi.
    You get to the heart of the problem. With a LTU color profile (my monitor is a NEC SV2090) I see a big difference between C1 and Photoshop CS3, with a matrix color profile the difference is minimal but still visible.
    Using Adobe Color Engine or Microsoft Color Engine I have no effect.
    Do you know what kind of Color Conversion Engine use C1?
    Any lead on how to remove the light difference with matrix profile?

    Best Regards
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  • thowi
    [quote="Claudio" wrote:
    With a LTU color profile (my monitor is a NEC SV2090) I see a big difference between C1 and Photoshop CS3
    What kind of differences? The "general appearance" of the images should be similar. But when using LUT profiles for displays Photoshop shows stairs effects in tonal values (most notable in comparison of greyscales). C1 handles LUT profiles very well.

    But... your monitor needs hardware calibration! So you should (must!) create two profiles!
    One for the monitor which is a 12bit LUT inside the monitor (access by USB-port in the monitor). This profile contains the color space of your monitor and (as the case may be) the correction curves messured by your calibration instrument and software.
    The second one should be a matrix profile and you have to set this profile as the system monitor profile in windows (and this is the one that C1 and Photoshop are looking for). This profile does not contain any correction curve for the graphic card (Video LUT) - it just describes the color space of your monitor. This is essential when using hardware calibrated monitors!

    with a matrix color profile the difference is minimal but still visible.
    Using Adobe Color Engine or Microsoft Color Engine I have no effect. Do you know what kind of Color Conversion Engine use C1?

    As far as I know C1 uses the color engine of the system, which is ICM if you use Windows. But I use the ACE in Photoshop too and do not have different results. The differences between ACE and ICM are irrelevant.

    Any lead on how to remove the light difference with matrix profile?

    What do you compare? The regular preview in C1 is 25% size and it can appear more saturated and more contrasty (most notable in black areas). Above all if you use sharpening in C1 as preview but process the images unsharpened.
    You should always control the image in the focus tab of C1 - and this crop should be exactly the same as the result in Photoshop (viewed 100%).
    Too, you could try to turn the backgorund in C1 to the brightest grey - because the backgorund in Photoshop is much brighter than the preset in C1 is.
    The only difference between the C1 preview and the tif in PS I notice is this: The preview of C1 has not the bit depth as a 16bit Tif after process. In images with bold dark areas the preview in C1 shows a slight difference in the tonal ranges close to black. As far as I notice values down from L*6 or 7 have less differences in C1 if you set high contrast in the tonal curve. But these cases are rare and normaly I do not see any differences.
    Best Regards.
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