I performed no step. I have a new lens and was looking for more than 1:1. Usually, I’m not a pixel peeper but I wanted to check is the lens is decentered or what else could be wrong.
File browser > double click > Z for 1:1 then I saw the “green blob”
It was only this single image. I should have kept the ARP, but it doesn’t happen anymore after:
File browser > right click > processing profile operations > clear
Thanks
Thanks
Understood. Let me know if it happens again
Greetings- first post and thank you for ART.
I bet I can help on this because I saw it yesterday and reproduced it just now in ART 1.22 on Windows 11.
On at least one raw file from my Olympus E-M10 Mark II, if I use embedded lens corrections and enable chromatic aberation correction, the green circle appears. If I disable the CA correction, the circle disappears. The circle doesn’t appear when I use “Automatic from database” lens correction or manual selection lens correction.
I have attached a raw file that exhibits the behavior, and a profile that allows you to just toggle that on and off. I agree to release the photo rights.
MX220401.ORF.arp (12.6 KB)
MX220401.ORF (13.4 MB)
I was delighted to see that ART can deal with the embedded olympus lens corrections in the raw files. I don’t think any of the other common open source raw developers do.
Also supported in darktable since the last 4.6 release.
Welcome!
The code in ART is in fact stolen from darktable, and chances are that I introduced some bug in the porting… I’ll take a look when time permits. Thanks
I was curious if it was just something with that particular lens or body that I used in the file above (Lumix 12-60 on E-M10m2) but found the green circle also appears in a photo I shot with E-M1m2 and Olympus 12-60 SWD (four thirds). So it doesn’t seem to be the body and/or lens specifically.
This maybe should spin off to a different topic but in looking at this issue I noticed a couple of things about embedded profiles…
My three four thirds lenses (12-60, 55-200, 14-54) only seem to embed CA corrections according to ACR. The Lumix 12-60 has CA and Geometric corrections embedded. I’m willing to believe that in the early 00’s, it wasn’t possible to do Geometric corrections in-camera so the lenses didn’t have that information transmitted.
I found some shots from my Fujifilm X-T10 and the XC 16-50 lens. ART auto matches that lens to the database and has no embedded corrections as an option.
ACR shows my Fuji XC 16-50 has CA, geometric and vignetting corrections embedded. I wonder if ACR has it embedded in itself and not actually the raw file since it seems to know about Fujifilm cameras and lenses without having separate profile files.
Lens correction data is saved in Raw file as metadata. And ART can read only some manufacturer’s (only Olympus / OM system?) metadata, because the format of lens correction metadata varies by manufacturer. If software developers want to get the metadata information from manufacturer, nondisclosure agreement with manufacturer is needed and FOSS developers cannot use these information. Only some metadata format which were hacked by volunteers are usable for FOSS.
I tried it quickly in darktable, and saw no problem there. At the same time, let me thank you for ART here, Alberto. Although I’m a darktable user, I do run ART (and RawTherapee, and filmulator…) from time to time, and it’s a great tool, results are impressive out of the box! So keep ‘stealing’ 
Also sony, Fujifilm, and dng
Hi,
do you have a sample image with visible CA? I think I fixed the problem but I’d like to test it before declaring success…
Thanks
That means if we convert a raw file that ART cannot read metadata to a dng file, then ART can read the metadata?
If the dng conversion also converts the metadata, then I suppose so. But I don’t know whether that is the case.
You mean “shared lovingly because we appreciate each other” 
Thank you. I will try it later.
2024年6月5日(水) 23:09 Alberto via discuss.pixls.us <noreply@discuss.pixls.us>:
ART 1.22 on Leap 15.5
Up to now, the green blob was only on the screen during the editing process but it wasn’t on the exported image. Now the green blob (grey since I converted to b&w) also shows up on the exported images.
Here’s the file:
Here’s the arp
here’s a exported jpg
here are the screenshots
I don’t know what changed but up to now, the blob was only in ART, now it’s also on the exported jpgs. Is there a way of not having the blob in the exported jpgs?
Thanks
The green circle was on the exported version for me before…
It’s fixed in master. Until the next release, just don’t use CA correction from the embedded metadata (you can use raw ca correction as an alternative)
Done! 
Unclicked the chromatic aberrations and it’s gone.
What’s the difference between:
Thanks
It’s just two different solutions for the same problem. Raw ca correction works only for Bayer files, and operates before demosaicing, which is good for the quality of the demosaicing (less artifacts to begin with). In my experience it works well in general, but of course it’s useless if you don’t start from a Bayer raw file.
The other algorithm is based on the metadata provided by the manufacturer; it should therefore be reasonably accurate, but the algorithm itself has been reverse engineered so it’s probably not 100% identical to what the camera does. And the implementation in art was buggy
You already fixed the problem, so it may not make sense, but
for reference, problems may occur with the raw files of Olympus camera models equipped with Sony sensors, but there may be no problems with models equipped with Panasonic sensors.
Also, there seems to be no problem even if you convert it to a dng file once.