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  1. Originally Posted by Okiba View Post
    Ermm, out4 doesn't seems to work for me (I used the exact same script but with the full loseless file and not just a part). Is your Histogram also identical? Because as you can see on the picture above, it's a bit different (which made sense to me because Jagbo said moving Level/Tweak is not accurate).
    Yes, the histograms are identical. In tweak you have to set bright=-62.5 though as -41*256/168=-62.47.
    What do you mean by 'out4 doesn't seem to work'? What do you get?
    I doubt that tweak will keep more details than Levels()+MergeChroma, but one has to make an extra 'manual' step for calculating the corresponding tweak values. But of course it's totally up to you which method you prefer
    Last edited by Sharc; 14th Oct 2020 at 13:30.
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  2. No error. Just Grey screen. But it's probably because I/Jagbo used 62 and the finer value is 62.47. Could be what modified the Histogram. Will check
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  3. Originally Posted by Okiba View Post
    No error. Just Grey screen.
    Well, a grey screen is exactly what one expects for out4 when the 2 variants A and B produce identical results, means when the difference is zero
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  4. Oh, I see. Should have checked what Subtract do
    Last edited by Okiba; 14th Oct 2020 at 13:49.
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  5. Originally Posted by jagabo View Post
    Look at the RGB cube inside the rec.601 YUV (YCbCr) cube:

    Image
    [Attachment 55405 - Click to enlarge]

    (That image originally came from https://software.intel.com/en-us/node/503873. But Intel appears to have (re)moved it.)
    It's available from here now:
    https://software.intel.com/content/www/us/en/develop/documentation/ipp-dev-reference/t...ml?language=en

    ... and similar from here:
    https://scc.ustc.edu.cn/zlsc/sugon/intel/ipp/ipp_manual/IPPI/ippi_ch6/ch6_color_models.htm
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  6. Sharc, thanks for those links. I've updated my shortcuts.
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