Some more info: when disabling all processing options (eg. boostAmount = 0, boostShadowAmount = 0, disableGamutMap = true, colorNoiseReductionAmount = 0, etc.) resulting DNG in Raw Therapee has some modifications enabled such as "Clip out-of-gamut colours" and "Highlight reconstruction".
avt232
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carstengp: I tried that but couldn't seem to extract the image from it. How would you do that?
Edit: We have now been able to decode the pixelBuffer. However Apple's native demosaic code is faster than our own. Is there a way to get the image with only a demosaic applied? Even with all the options mentioned earlier, several non-linear changes are made.