Finally got it solved. dt-chart is really picky about white spaces, I had already worked on removing double empty lines and double spaces between values, but there was still some additional white space at the end of lines and beginning of lines.
But now a completely different question: The styles generated by dt-chart employ a number of display-referred modules, that do no longer belong to the new v3 scene-referred standard workflow. Any thoughts of the experts on this? Will there be a new approach for camera profiling following the new approach of dt?
Its not exactly the same the …new feature tweaks the channel mixer to improve any color deviation that has been created from wb and the input profile. Darktable chart created a style with a lut and tone curve that could be used in two ways…1 against a color chart…like the reference for the new method…but you could also use the in camera jpg as a reference to try to achieve color matching to the jpg…now with scene referred I think the recommended way would be to keep the lut and drop the tone curve…
just to clarify – color calibration is for correcting colours under a particular illuminant against the reference values for the colour charts – ie. standardising the colours. It is an altermative to producing an ICC matrix profile for your camera.
darktable-chart can also be used for matching colours between JPEGs – in that case, the JPEG you are matching against is already a display-referred image, and so using display-referred modules probably makes sense in that case.
Yes, my primary target is less to calibrate for the correct color according to a color chart, but rather to make the Canon picture profiles available that provide different color matrices from RAW to JPG. While using Lightroom I never used the Adobe standard profile (which to my understanding is the darktable standard input color matrix) but rather the best fitting Canon color profile. So ideally these should be available as input color matrix. But applying the Color LUT created by darktable-chart at the end of the pipe is a possibility. Thanks for the input.
I have used darktable-chart successfully some time ago. I think it was version 3.8 or 4.0. Now I want to create a new style with darktable version 4.2. but if I load the new exported pfm file in darktable-chart it is black. The old pfm file works fine. Do you know, where’s the problem with the new exported pfm files (everything is set right including the export in lab). Is there a know bug?
I think it has to do with the processing and upscaling… if you have them set to yes set them to no and retry… or the reverse… I think one of those settings results in the black file issue…
Edit : I will try at home on my PC and confirm but it seems not to be working again at least when I did a quick build and install…
Perfect! That’s it. Now it works again.
It works only if “allow upscaling” and “hight quality resampling” are set to “no”.
If one parameter is set to “yes” it will be black.
I have no idea why the author would think that to be important to camera profiling. AdobeRGB and sRGB are output colorspaces, and the camera only uses them to make the embedded JPEG rendition. Oh, and to stick a tag in the metadata identifying the output profile used to make the JPEG. It doesn’t affect the raw data one whit.
I’ve done a lot of camera profiling with other software, I know what the input data should be.