Which output colorspace did my TIFF file really get?

Software darktable
1

Problem:

When I export a raw file (ARW) to have a TIFF file created, the raw file will have ProPhoto as Output color profile - but I seem to get sRGB in all cases.

The export settings are these:

export settings

It makes no difference to this problem if profile is ‘image settings’, or ‘ProPhoto’ has been chosen from the list.

When the TIFF has been generated, I import it to the collection (add to library…).
(Each time a single image is imported, it will open in darkroom, not relevant but strange).

The confusing part is that Output color profile now says ‘sRGB (web-safe)’. I am not changing anything, as I really isn’t interested in a side car file for the TIFF (guess it is created anyway when the file has been opened in darkroom).

Now I am in doubt - which output profile did the TIFF file actually get?

What can I do to find out?

2

Have you checked the output file directly? I am on Linux Debian. I do this:

exiftool -icc_profile:* <filename.ext>

Example output for 16-bit TIF:

$ exiftool -icc_profile:* 0Y8A7359_01_g.tif
Profile CMM Type                : Little CMS
Profile Version                 : 4.3.0
Profile Class                   : Display Device Profile
Color Space Data                : RGB
Profile Connection Space        : XYZ
Profile Date Time               : 2018:11:13 11:18:01
Profile File Signature          : acsp
Primary Platform                : Apple Computer Inc.
CMM Flags                       : Not Embedded, Independent
Device Manufacturer             : 
Device Model                    : 
Device Attributes               : Reflective, Glossy, Positive, Color
Rendering Intent                : Perceptual
Connection Space Illuminant     : 0.9642 1 0.82491
Profile Creator                 : Little CMS
Profile ID                      : 0
Profile Description             : RTv4_Large
Profile Copyright               : Copyright RawTherapee 2018, CC0
Media White Point               : 0.9642 1 0.82491
Chromatic Adaptation            : 0.99995 -3e-05 -3e-05 -5e-05 1.00005 -2e-05 -2e-05 2e-05 0.99974
Red Matrix Column               : 0.79771 0.28806 0
Blue Matrix Column              : 0.03133 8e-05 0.82489
Green Matrix Column             : 0.13516 0.71187 2e-05
Red Tone Reproduction Curve     : (Binary data 40 bytes, use -b option to extract)
Green Tone Reproduction Curve   : (Binary data 40 bytes, use -b option to extract)
Blue Tone Reproduction Curve    : (Binary data 40 bytes, use -b option to extract)
Chromaticity Channels           : 3
Chromaticity Colorant           : Unknown (0)
Chromaticity Channel 1          : 0.7347 0.2653
Chromaticity Channel 2          : 0.15961 0.84039
Chromaticity Channel 3          : 0.03661 0.00011
Device Mfg Desc                 : RawTherapee

In my case: Profile Description : RTv4_Large

(I use Adobe ProPhoto output color profile RTv4_Large. but that is just this particular file).

I also use Darktable, but RawTherpaee Wiki has a page where different methods to examine embedded color profile in a picture file output: How to extract and examine ICC profiles - RawPedia

EDIT: Darkroom → Output color profile → export profile is just a default setting for file export for the Output color profile module. It does not state which embedded color profile a tif or jpg file has.

EDIT: Darkroom → Export → profile → image settings means that the profile set in Darkroom → Output color profile will be used, but this can be overridden.

1 Like
3

Thank you Karl Magnus

The ProPhoto profile is in place:

exiftool-output
exiftool-output786×613 158 KB

Nice to know.

4

That would be the output profile for the new development (of the imported TIFF), if you chose to export it again. The profile of the TIFF itself is now under input profile (since it’s your input now).

5

That’s new understanding - and of course - Thanks a lot.