Fedora 41, ART built from latest sources. Output Profile is set to sRGB (ICC V4)
For exported JPEG exif tool shows that Color Space is set to Uncalibrated. How do I fix this?
For comparison DT correctly sets Color Space to sRGB
Hi,
Iām willing to help but please help me out by sharing the relevant information (in this case, as minimum the exported jpeg, the sidecar, the exiftool version you are using, and the tag you expect to see but didnāt find).
Thanks!
Hi Alberto,
Thank you for the prompt reply.
Here all all the files and info you requested:
DSC03689.ARW.arp (11.4 KB)
exif --version
0.6.22
The tag is āColor Spaceā as I mentioned in my original message:
$ exif /data/images/A7IV/2024/Napa-Nov/11041117/converted/DSC03689-1.jpg
EXIF tags in ā/data/images/A7IV/2024/Napa-Nov/11041117/converted/DSC03689-1.jpgā (āIntelā byte order):
--------------------Ā±---------------------------------------------------------
Tag |Value
--------------------Ā±---------------------------------------------------------
Image Description |
Manufacturer |SONY
Model |ILCE-7M4
X-Resolution |350
Y-Resolution |350
Software |ART 209a565ce
Resolution Unit |Inch
Exposure Time |1/200 sec.
F-Number |f/4.0
ISO Speed Ratings |100
Date and Time (Origi|2024:11:17 15:51:40
Exposure Bias |0.00 EV
Flash |Flash did not fire, compulsory flash mode
Focal Length |48.0 mm
User Comment |
Lens Model |FE 24-105mm F4 G OSS
Exif Version |Exif Version 2.1
FlashPixVersion |FlashPix Version 1.0
Color Space |Uncalibrated
--------------------Ā±---------------------------------------------------------
I also tried other programs related to EXIF found in Fedora repos:
$ exiv2 --version
exiv2 0.28.3
perl-Image-ExifTool.noarch: Utility for reading and writing image meta info
And I downloaded and tried exiftool from its GitHub repo:
Please let me know what else I can do.
Thanks a lot for your help!
Nothing wrong with your file:
$ exiftool DSC03689-1.jpg
ExifTool Version Number : 13.07
File Name : DSC03689-1.jpg
Directory : .
File Size : 9.4 MB
File Modification Date/Time : 2024:12:20 20:43:37+01:00
File Access Date/Time : 2024:12:20 20:43:15+01:00
File Inode Change Date/Time : 2024:12:20 20:43:37+01:00
File Permissions : -rw-rw-r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
Exif Byte Order : Little-endian (Intel, II)
Image Description :
Make : SONY
Camera Model Name : ILCE-7M4
X Resolution : 350
Y Resolution : 350
Software : ART 209a565ce
Exposure Time : 1/200
F Number : 4.0
ISO : 100
Date/Time Original : 2024:11:17 15:51:40
Exposure Compensation : 0
Flash : Off, Did not fire
Focal Length : 48.0 mm
User Comment :
Lens Model : FE 24-105mm F4 G OSS
XMP Toolkit : XMP Core 4.4.0-Exiv2
Rating : 1
Document ID : urn:uuid:31eb7b38-d03a-4f92-9036-c609a940d3a6
Instance ID : urn:uuid:65b987ff-b252-48a5-bd22-fd0d5bb6cadb
Derived From : DSC03689.ARW
Import timestamp : 63868506220313233
Change timestamp : 63870248851259606
Export timestamp : 63870248073021138
Print timestamp : -1
Xmp version : 5
Raw params : 0
Auto presets applied : 1
History end : 26
Iop order version : 4
History auto hash : cd2e213ac1bb2e5bb64cd7eec5990671
History current hash : a6ef7f0f11f4703e24d8e7d93b1761c4
Masks history :
History Num : 0
History Operation : rawprepare
History Enabled : 1
History Modversion : 2
History Params : 000000000000000088000000b00100000002000200020002003c000000000000
History Multi name :
History Multi name hand edited : 0
History Multi priority : 0
History Blendop version : 13
History Blendop params : gz10eJxjYIAACQYYOOHEgAZY0QUYGBgYsYgxMDTYQ/BI5VMX/P///z+IAQBqch0F
Subject : abase, arw, changed, darktable, exported, format, style
Hierarchical Subject : darktable|changed, darktable|exported, darktable|format|arw, darktable|style|abase
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 : 2022:08:22 16:09:45
Profile File Signature : acsp
Primary Platform : Apple Computer Inc.
CMM Flags : 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 : sRGB (ICC V4)
Profile Copyright : Public Domain
Media White Point : 0.9642 1 0.82491
Chromatic Adaptation : 1.04788 0.02292 -0.05022 0.02959 0.99048 -0.01707 -0.00925 0.01508 0.75168
Red Matrix Column : 0.43604 0.22249 0.01392
Blue Matrix Column : 0.14305 0.06061 0.71391
Green Matrix Column : 0.38512 0.7169 0.09706
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
Chromaticity Channel 1 : 0.64 0.33
Chromaticity Channel 2 : 0.3 0.60001
Chromaticity Channel 3 : 0.14999 0.06
Device Model Desc : #us/pixls/ART#2.400000:12.92310!
Device Mfg Desc : ART
Current IPTC Digest : 8bffb0d08da4239edcb6b2f5879b0658
Coded Character Set : UTF8
Keywords : abase, arw, changed, darktable, exported, format, style
Image Width : 7020
Image Height : 4680
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:4:4 (1 1)
Aperture : 4.0
Image Size : 7020x4680
Megapixels : 32.9
Shutter Speed : 1/200
Focal Length : 48.0 mm
Light Value : 11.6
Lens ID : FE 24-105mm F4 G OSS
I have no idea what that program is, but I would check with its developers
These are the tags found by exiftool and filtered by ācolorā from jpeg produced by DT:
andrew@obama:exiftool$ /data/soft/exiftool/exiftool /data/images/A7IV/2024/Napa-Nov/11041117/darktable_exported/DSC03689.jpg |grep -i color
Color Temperature : Auto
Color Compensation Filter : 0
Color Mode : Standard
Color Space : sRGB
Color Space Data : RGB
Device Attributes : Reflective, Glossy, Positive, Color
Chromaticity Colorant : Unknown
Color Components : 3
and from ART:
andrew@obama:exiftool$ /data/soft/exiftool/exiftool /data/images/A7IV/2024/Napa-Nov/11041117/converted/DSC03689.jpg |grep -i color
Color Space Data : RGB
Device Attributes : Reflective, Glossy, Positive, Color
Chromaticity Colorant : Unknown
Color Components : 3
The tag āColor Spaceā with value āsRGBā is missing in the ART output.
I think this is why some image viewers (like eog or geeqie) display jpegs with less saturation and contrast compared to ART preview.
So, is this the real issue you are trying to solve, or is it really the missing tag that you find problematic? Because the two are unrelated. Both apps you mention apply the color profile embedded in the image correctly, at least here, and in fact I see no difference between them and the ART preview.
You can get this tag by activating it in the meta tab.
But I donāt think this is related to the embedded profile but just shows the camera setting when capturing the photo.
Thank you all for thoughts and suggestions. Yes, the main reason for this question was that in some Linux viewers JPEGs from ART looked slightly washed out compared to preview and DT results. I compared EXIF data between ART and DT JPEGs and noticed the missing sRGB. I guess I need to take a look at embedded color profiles insteadā¦
1 Like
I would make sure that the various apps are using the same colour management settings. Which means not only the same display colour profile, but also the same rendering intent and black point compensation (bpc) setting. For example geeqie has no user option for bpc, iirc itās harcoded to off. If you have it on in art (again Iām talking about the display profile here, not the picture one) that alone might explain the difference.
HTH
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Thank you, Alberto. Yes, thatās the case - BPC is on in ART Color Management settings. Iāll do some more experimenting.