Closed zorrozork closed 5 years ago
On Sun, Feb 24, 2019 at 2:03 PM zorrozork notifications@github.com wrote:
Is this correct and a conversion to "raw intensity" is needed for the input images?
Yes.
And if so is the result of the above mentioned gamma correction that the input is in linear RGB? So for example when applied to standard definition video with matrix '601' the frames should be converted to linear RGB before applying Butteraugli? Thanks!
You need to convert into linear RGB light where RGB are sRGB. These values may be (slightly) negative for wide gamut use. The normalization value of 255 corresponds roughly to 120-200 nits.
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Thanks for the clarification, it's all clear now.
The butteraugli.h header contains this comment:
Is this correct and a conversion to "raw intensity" is needed for the input images? And if so is the result of the above mentioned gamma correction that the input is in linear RGB? So for example when applied to standard definition video with matrix '601' the frames should be converted to linear RGB before applying Butteraugli? Thanks!