Colour Space for grading for the Internet?

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litote

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Colour Space for grading for the Internet?

PostThu Jan 17, 2019 1:08 pm

When colour grading for output to the Internet, should I select SRGB for the colour space? I know Rec 709 is intended for HD broadcast, but do some people prefer to select this as the colour space even though they are grading for Internet delivery?
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Andrew Kolakowski

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Re: Colour Space for grading for the Internet?

PostThu Jan 17, 2019 1:39 pm

Rec.709 with 2.2 gamma or sRGB preset should do.
Most screens are crap, so it will look very different on each one anyway.
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litote

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Re: Colour Space for grading for the Internet?

PostThu Jan 17, 2019 2:02 pm

@Andrew Kolakowski

Thanks Andrew.

Does Rec 709 typically apply a gamma of 2.4? Some info suggests it can sometimes apply 2.2. In that case, what gamma is being applied if I choose Rec 709 for Output Gamma in the Color Space Transform? Is that why you specified Rec 709 with gamma 2.2? If I opt to set Rec 709 should I then set Output Gamma: sRGB to get a correction of 2.2? Is that what you meant?

If I choose the sRGB option to apply a Color Space Transform from the OpenFX tab to an URSA 4.6K LOG clip, are these the correct Settings?:

Input Color Space: Blackmagic Design 4.6K Film v3
Output Color Space: sRGB

Input Gamma: BMD 4.6K Film Log
Output Gamma: sRGB
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Andrew Kolakowski

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Re: Colour Space for grading for the Internet?

PostThu Jan 17, 2019 3:29 pm

litote wrote:@Andrew Kolakowski

Thanks Andrew.

Does Rec 709 typically apply a gamma of 2.4? Some info suggests it can sometimes apply 2.2. In that case, what gamma is being applied if I choose Rec 709 for Output Gamma in the Color Space Transform? Is that why you specified Rec 709 with gamma 2.2? If I opt to set Rec 709 should I then set Output Gamma: sRGB to get a correction of 2.2? Is that what you meant?

If I choose the sRGB option to apply a Color Space Transform from the OpenFX tab to an URSA 4.6K LOG clip, are these the correct Settings?:

Input Color Space: Blackmagic Design 4.6K Film v3
Output Color Space: sRGB

Input Gamma: BMD 4.6K Film Log
Output Gamma: sRGB


Typically now Rec.709 is graded with 2.4 gamma, but old Rec.709 did not use 2.4. More like 1.96.
It should not be called Rec.709 anymore but BT.1886 which is basically old Rec.709 gamut with 2.4 gamma.

Your settings for sRGB are good.

Just remember that in order for all to be correct you monitor has to be set to match your Resolve setting.
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litote

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Re: Colour Space for grading for the Internet?

PostThu Jan 17, 2019 4:27 pm

Thanks Andrew!

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