I converted a Canon CR2 RAW to 16-bit TIFF using RT Queue with RTv4-Medium output profile with Rendering intent “relative colorimetric”. The files are here. (The image is part of a focus stack).
filebin link, as an alternative. https://filebin.net/kzdjf7h7700qln1f
I get “Rendering Intent : Perceptual” as a tag in the TIFF file. Should this be “Rendering Intent : Relative Colorimetric”, or similar? Does this matter for a printer receiving the TIFF file?
Command: exiftool _Y8A8348-AdobeRGB.tif | grep Rendering
Result: Rendering Intent : Perceptual
Command: identify _Y8A8348-AdobeRGB.tif displays as:
_Y8A8348-AdobeRGB.tif TIFF 4492x6732 4492x6732+0+0 16-bit sRGB 173.045MiB 0.000u 0:00.000.
This the Imagemagick command identify. I wonder why identify outputs “sRGB”? (This is ultimately a question to Imagemagick developers).
However, Command:
identify -verbose _Y8A8348-AdobeRGB.tif | grep Colorspace
shows:
“Colorspace: sRGB”.
Why is “Colorspace” set to “sRGB” in RT TIFF output when I pick RTv4_medium (AdobeRGB) as output profile?
There are hundreds of lines of data from identify -verbose and exiftool. Honestly, I do not know if the output above matters at all. Perhaps my 16-bit tiff file renders perfectly when printed at the printing company and tags quoted are irrelevant? I do not know.
Environment:
Debian Testing
RT 5.8-2838-g8bf1098d7 from source
I used “put image to queue” from main edit window for the CR2 RAW file and then in queue tab I selected tiff (16-bit) and pressed “on”. I exported only one picture. I did not use “save current image” from main window.
I think, but I do not know that this is picked up from RTv4_Medium.icc output profile which has “Rendering Intent : Perceptual”, or from the working profile RTv4_Large.icc which also has “Rendering Intent : Perceptual”.
(in post number 2).
Should this be “relative colorimetric” instead, since I choose this intent when I created the TIFF file? Or “perceptual” is the de facto standard for printing AdobeRGB (RTv4_Medium.icc) and is therefore the default. A user who want to change this has to edit RTv4_Medium.icc Rendering Intent default?