When RT opens a JPG or TIF that is tagged internally as to its color space (sRGB or Adobe RGB in practice), does RT convert it to the same colors in the working color space?
I could not find the answer in Rawpedia. I tried some experiments opening photos, but I could not see significant changes and get to a conclusion.
(The reason for the question: if you like a camera JPG, you can make another version in Adobe RGB in Fuji X cameras and I suppose other brands. Then post process a few adjustments in RT and output an Adobe RGB file. I got great prints of a couple of photos this way.)
The question I’d tack on here: will going from an sRBG jpeg/tiff to and AdobeRBG jpeg/tiff gain you anything?
I generally try and convert color spaces as few times as possible.
The Fuji X camera at default produces an sRGB JPG from the raw data. However, the user can get an Adobe RGB JPG from the same raw data. This is different than translating an sRGB image to Adobe RGB or vice versa.
Indeed, if you have a camera that shoots raw. Many phones shoot sRGB jpeg, which is what I’m curious about; I was just hoping to piggy back on your question.
When you convert an sRGB image into a wider gamut such as Adobe RGB, the colors stay the same. If you do it the other way, the colors which fall outside the gamut get clipped (colorimetric) or all colors are compressed (perceptual) or other.
Set the output profile in RawTherapee to Adobe RGB or to RT_Medium_gsRGB (generally speaking its the same thing).
It could, because when you adjust colors you could push some colors out of the sRGB gamut. But if you just want to convert the tagged image from sRGB to Adobe RGB without making adjustments, there’s no point.
It is, because the camera starts off with the huge color gamut defined by the camera input profile, then chops that down to sRGB or Adobe RGB. Once you chop it down to Adobe RGB you can’t magically regain what you chopped off (unless you used the perceptual rendering intent and a high bit depth format, but that’s not something you can do in today’s cameras).
I understand what happens in the Color Management section of the Color tab when RT opens a raw file. But what happens when I have RT open a JPG or TIF? Do I check “Use embedded, if possible”? If the JPG is sRGB, will the colors stay the same going into a working color space of Adobe RGB or ProPhotoRGB?
I also understand the output process, including colorimetric or perceptual when saving to a color space narrower than the working color space. My question is about opening a JPG or TIF.
RawTherapee does that automatically.
Thank you. A note for the expanding RT community: Camera JPGs have become quite good in many instances. We should make more prominent the fact that you can open a camera JPG directly in RT – and that many cameras can make the JPG in Adobe RGB color space – and do a moderate amount of work on it without suffering serious posterization: raise shadows, brighten or darken midtones, do some more noise reduction and RL deconvolution sharpening, bend hues with the HSV Equalizer section, resize for the Web or for a printer, and so on.