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本帖最后由 sommio 于 2023-3-5 14:20 编辑
LittleCMS 的实现比 ColorSync 更加符合规范，就算要兼容也得找 LittleCMS 作者来做（
关于那个 issue，owner 不喜欢 mpv 的 bt.1886 提高暗部亮度变成“灰色”，gamma2.2 和 gamma2.4 都能解决这个问题，最终 owner 选择了后者，随着讨论进行也有人指出 bt.1886 在 10% 水平上不比 gamma 2.2 更暗。haasn 也没有说要跟显示器校准 gamma 相同，而是 eg.
it does so using BT. 1886 as the EOTF for HD media, which contains black point compensation, raising blacks to avoid crushing them below the black point of the display. This is sometimes done inaccurately, as when an ICC profile contains inaccuracies near black.
再往下就变成了 De jure vs De facto
Although most HD video is delivered with the BT.1886 EOTF, it seems that most professional video is actually graded on monitors calibrated to a pure of gamma curve of 2.4 or 2.2, not BT.1886. Instead of following the standard, video is graded on a gamma curve and just incorrectly tagged as BT.1886, causing most content to appear to have lifted blacks. To get the intended display, you instead just have to assume it was graded to gamma 2.4 and change settings in software accordingly, or calibrate your own monitor to gamma 2.4. |
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