Turn off gamma remapping when changing between 8/16 bit/channel and 32 bit/channel floating point modes.

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  • Updated 4 years ago
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With the introduction of luts in CS6, those's users who want to manage their logical/float colour space conversions themselves, could do so easier if they had the option to turn off Photoshops feature of remapping pixel values when going between 16bit>32bit & 32bit>16bit modes.

ta+
./rafal
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Rafal Kaniewski

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Posted 4 years ago

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Chris Cox

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If you use a linear profile for your 16 bit/channel image, then you won't get any gamma correction when going from 16 bit/channel to 32 bit/channel.

But in 99% of cases, the gamma correction is needed to make the 32 bit/channel image appearance match the 16 bit/channel image appearance.
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Rafal Kaniewski

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I agree that the '99%' artists who work in print or web need not to work at higher float bit depths that mimic reality, but for artists working in TV/Film/VR/Art Installation/Games etc. having Photoshop play ball with post 1998 colour pipelines would be advantageous..... i.e. having importable 3dluts is a great new feature.

If an artist wants to manage their own colour space conversions using luts, then why do they not have that option... Changing the profile to linear, when the image is not linear, so an artist can bypass 'a helpful feature' to go from 16bit>32bit is a questionable hack, and having to change the main color settings to linear incorrectly to go from 32bit>16bit is again a confusing workflow.
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Chris Cox

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Nobody said that 32 bit/channel wasn't needed. But for most users the conversions need to account for the difference between the gamma encoded 8/16 bit/channel colorspaces and the linear (gamma 1.0) 32 bit/channel colorspaces -- thus requiring a conversion. Without that conversion, the 32 bit/channel image would not look right, nor correctly represent gamma 1.0 data.

Supplying a gamma 1.0 profile for the 8/16 bit data is only needed in the limited case where you want to convert to 32 bit/channel without a gamma correction (because presumably you already know that your data is gamma 1.0, and the profile then identifies it as such). You don't have to change the app color settings, just the document profile. If you want a linear conversion from a document to a gamma 1.0 colorspace (which 32 bit/channel is), then your source document must also be gamma 1.0, and you supply a profile that identifies it as such.

Photoshop is a modern color pipeline, and has been following advances all along. And ACES is now moving film and video into the color world that everyone else has been using since the 1990s.