Offset profile TRC?

Home Forums Help and Support Offset profile TRC?

Viewing 8 posts - 1 through 8 (of 8 total)
  • Author
    Posts
  • #138435

    Gregow
    Participant
    • Offline

    Sorry if this is a bit confused…

    Is it possible to offset the TRC in such a way that the profile thinks the display is set at ~2.2 gamma, while it is in fact ~2.4?

    So essentially:

    My display has a much better TRC when set at 2.4 gamma, rather than 2.2.

    I also happen to be nocturnal and often work in a dark/dim room. A 2.4 gamma could compensate for that, I think.

    However, setting the display at 2.4 will only work in non-managed applications.

    In color managed applications I would have to set up a LUT or proofing. This could be cumbersome with different color spaces, and I can’t very well do double proofing.

    So, what are my options here?

    #138442

    Vincent
    Participant
    • Offline

    Sorry if this is a bit confused…

    Is it possible to offset the TRC in such a way that the profile thinks the display is set at ~2.2 gamma, while it is in fact ~2.4?

    synth profile with your primaries, white and fake TRC. Then add VCGT calibration using Argyllcms commandline iccvcgt

    In color managed applications I would have to set up a LUT or proofing. This could be cumbersome with different color spaces, and I can’t very well do double proofing.

    BUT doing this will result in innacurate color management. All you see will have wrong relative brightness relative to white color…. so it seems not a very sensible aproach.

    My display has a much better TRC when set at 2.4 gamma, rather than 2.2.

    What do you mean? grey color? irregular gamma vs input plot?

    #138447

    Gregow
    Participant
    • Offline

    Sorry if this is a bit confused…

    Is it possible to offset the TRC in such a way that the profile thinks the display is set at ~2.2 gamma, while it is in fact ~2.4?

    synth profile with your primaries, white and fake TRC. Then add VCGT calibration using Argyllcms commandline iccvcgt

    In color managed applications I would have to set up a LUT or proofing. This could be cumbersome with different color spaces, and I can’t very well do double proofing.

    BUT doing this will result in innacurate color management. All you see will have wrong relative brightness relative to white color…. so it seems not a very sensible aproach.

    My display has a much better TRC when set at 2.4 gamma, rather than 2.2.

    What do you mean? grey color? irregular gamma vs input plot?

    How do I do that? How can I find out what the primaries are and create a synthetic profile?

    Are there more sensible approaches to achieve what I want? Having the wrong relative brightness could certainly be bothersome.

    My goal here is to create content for online consumption, while working with the source material in wider gamuts. That means photography, digital painting, 3D, VFX and video.

    What I mean regarding my displays TRC is that, set at gamma 2.5 (effective gamma 2.44) is that the greyscale tracking is much more even. Set at 2.2 it’s not exactly great.

    And now, considering it’s a crappy Asus gaming montior (Xg279Q), I’m not too keen on fixing the gamma through the video card gamma table. Banding would ensue.

    #138448

    Vincent
    Participant
    • Offline

    Sorry if this is a bit confused…

    Is it possible to offset the TRC in such a way that the profile thinks the display is set at ~2.2 gamma, while it is in fact ~2.4?

    synth profile with your primaries, white and fake TRC. Then add VCGT calibration using Argyllcms commandline iccvcgt

    In color managed applications I would have to set up a LUT or proofing. This could be cumbersome with different color spaces, and I can’t very well do double proofing.

    BUT doing this will result in innacurate color management. All you see will have wrong relative brightness relative to white color…. so it seems not a very sensible aproach.

    My display has a much better TRC when set at 2.4 gamma, rather than 2.2.

    What do you mean? grey color? irregular gamma vs input plot?

    How do I do that? How can I find out what the primaries are and create a synthetic profile?

    from current profile info, but given the new information you provide, it is not needed:

    My goal here is to create content for online consumption, while working with the source material in wider gamuts. That means photography, digital painting, 3D, VFX and video.

    What I mean regarding my displays TRC is that, set at gamma 2.5 (effective gamma 2.44) is that the greyscale tracking is much more even. Set at 2.2 it’s not exactly great.

    Then calibrate to 2.5. Color managed apps won’t care as long as display profile stores that gamma. It will “undo” your gamma to image colorsace TRC.

    #138455

    Gregow
    Participant
    • Offline

    Sorry if this is a bit confused…

    Is it possible to offset the TRC in such a way that the profile thinks the display is set at ~2.2 gamma, while it is in fact ~2.4?

    synth profile with your primaries, white and fake TRC. Then add VCGT calibration using Argyllcms commandline iccvcgt

    In color managed applications I would have to set up a LUT or proofing. This could be cumbersome with different color spaces, and I can’t very well do double proofing.

    BUT doing this will result in innacurate color management. All you see will have wrong relative brightness relative to white color…. so it seems not a very sensible aproach.

    My display has a much better TRC when set at 2.4 gamma, rather than 2.2.

    What do you mean? grey color? irregular gamma vs input plot?

    How do I do that? How can I find out what the primaries are and create a synthetic profile?

    from current profile info, but given the new information you provide, it is not needed:

    My goal here is to create content for online consumption, while working with the source material in wider gamuts. That means photography, digital painting, 3D, VFX and video.

    What I mean regarding my displays TRC is that, set at gamma 2.5 (effective gamma 2.44) is that the greyscale tracking is much more even. Set at 2.2 it’s not exactly great.

    Then calibrate to 2.5. Color managed apps won’t care as long as display profile stores that gamma. It will “undo” your gamma to image colorsace TRC.

    No no, I’m sorry for being unclear. I don’t want color managed applications do “undo” the gamma. In fact, I want to keep it.

    My thinking behind this is that I’m a nocturnal creature. Most of the time I work in a dark environment. Meanwhile, the rest of the worlds population is quite strange. They wake up when I go to sleep. If they view my content online they are likely in a brighter environment. Perhaps they have even experienced the phenomenon called sunlight.

    So you see, this is why I think adjusting my gamma would be a good idea. This combined with the fact that my shitty gamer display works best at a higher (or lower, as it’s an inverse function) gamma.

    Now, I would be cocksure about my conviction here, except… well, my Iphone tells me I’m wrong. Under the same viewing conditions my Iphone tells me the image is too dark and undersaturated – compared to what I see on the monitor.

    Say what you will about Apple, but I think it’s a fair assumption that they’ve nailed the color science better than I have.  In all seriousness, I’ve found my Apple devices (Iphone and Ipad Pro) to be decent litmus tests. So far, it seems my computer display is quite a bit off.

    #138456

    Vincent
    Participant
    • Offline

    Sorry if this is a bit confused…

    Is it possible to offset the TRC in such a way that the profile thinks the display is set at ~2.2 gamma, while it is in fact ~2.4?

    synth profile with your primaries, white and fake TRC. Then add VCGT calibration using Argyllcms commandline iccvcgt

    In color managed applications I would have to set up a LUT or proofing. This could be cumbersome with different color spaces, and I can’t very well do double proofing.

    BUT doing this will result in innacurate color management. All you see will have wrong relative brightness relative to white color…. so it seems not a very sensible aproach.

    My display has a much better TRC when set at 2.4 gamma, rather than 2.2.

    What do you mean? grey color? irregular gamma vs input plot?

    How do I do that? How can I find out what the primaries are and create a synthetic profile?

    from current profile info, but given the new information you provide, it is not needed:

    My goal here is to create content for online consumption, while working with the source material in wider gamuts. That means photography, digital painting, 3D, VFX and video.

    What I mean regarding my displays TRC is that, set at gamma 2.5 (effective gamma 2.44) is that the greyscale tracking is much more even. Set at 2.2 it’s not exactly great.

    Then calibrate to 2.5. Color managed apps won’t care as long as display profile stores that gamma. It will “undo” your gamma to image colorsace TRC.

    No no, I’m sorry for being unclear. I don’t want color managed applications do “undo” the gamma. In fact, I want to keep it.

    As said before…

    BUT doing this will result in innacurate color management. All you see will have wrong relative brightness relative to white color…. so it seems not a very sensible aproach.

    Anyway if you want to do it, do as explained. Create a single curve + matrix profile to 2.5. After calibration & profile get grey calibratio (.cal), get white & primaries from profile (displaycal profile info). The create a synth profile with thos eprimaries, that white, 2.2 gamma add ypur 2.5 calibvration (.cal) using iccvgt app.

    My thinking behind this is that I’m a nocturnal creature. Most of the time I work in a dark environment. Meanwhile, the rest of the worlds population is quite strange. They wake up when I go to sleep. If they view my content online they are likely in a brighter environment. Perhaps they have even experienced the phenomenon called sunlight.

    So you see, this is why I think adjusting my gamma would be a good idea. This combined with the fact that my shitty gamer display works best at a higher (or lower, as it’s an inverse function) gamma.

    I’ll say it’s a bad idea. Just lower brightness.

    #138458

    Gregow
    Participant
    • Offline

    Hm, so why 2.5 gamma in the synthetic profile?

    And, why do you think lowering brightness would work? I mean, it may be a gaming monitor but I don’t think the response curve should be effected by lowering brightness. Either way, I can’t lower the brightness much at all. I would just like to understand the reasoning. My brightness setting is at 4% which is ~115 nits.

    #138466

    Vincent
    Participant
    • Offline

    Hm, so why 2.5 gamma in the synthetic profile?

    I have not said that. Read again.

    And, why do you think lowering brightness would work? I mean, it may be a gaming monitor but I don’t think the response curve should be effected by lowering brightness. Either way, I can’t lower the brightness much at all. I would just like to understand the reasoning. My brightness setting is at 4% which is ~115 nits.

    If you said you like a dark enviroment, lower brightness.
    If you say you like 2.5 TRC for non color managed enviroment OK
    If you say you want to fake 2.2 for color management engine but keep actual g2.5, then color management is broken and you will see all things wrong.

Viewing 8 posts - 1 through 8 (of 8 total)

You must be logged in to reply to this topic.

Log in or Register

Display Calibration and Characterization powered by ArgyllCMS