EOS R5 Artifact in Image

[musicmaiden]

I just got a refurbished R5 and when taking it out on the second day, I got this pink band on a couple of images. What could cause that band? 

[rs-eos · Accepted solution]

Thanks for providing those.  Definitely strange.

In Finder (I use a Mac), the thumnail that was shown for the RAW file does show the pink area.  Same when pressing spacebar to bring up QuickLook.  The JPEG though is a-ok in Finder.

I then imported both images into Lightroom Classic (version 13.1 with Camera Raw 16.1).  Both previews were a-ok.  And bringing up each one in Develop also showed no issues.  I then exported each and both of the exported files had no issues.

Finally, I opened up both the RAW and JPEG in Photoshop.  Same outcome; no issues.

Thus, I'm going to conclude that it's the preview image that is embedded in the RAW file that is bad.   There are definitely experts with RAW images on these forums, so perhaps they'll be able to shed more light on all this.

What you could perhaps start doing is capturing RAW to both of your cards to see if perhaps one card is leading to the issues.  Beyond that, I wouldn't know what could be causing the embedded preview to be bad when the RAW appears OK otherwise, and the captured JPEG is also good.

[musicmaiden]

Kvbarkley, I will extract the JPEG Preview of the Raw file in PhotoMechanic and see what it shows to confirm it! Thanks for the tip!   I can deal with a corrupt preview, as long as it is not the sensor !

Addendum:  I extracted the JPEG of the RAW file in Photomechanic and it showed the same banding, so a corrupt embedded preview! Thank you!

[musicmaiden]

Thank you Ricky!! Since I had issues with the first refurb R5, I was a bit concerned about now having to deal with a return because of a bad sensor until I came across the Pink LR Preview and then a "corrected" image when pulling it up.  It sure sounds good to hear from an expert that it seems to be some sort of file error. As you suggested, I will set both captures to CR3 or CRaw and to separate cards to see if it repeats.  Appreciate your time and expertise!

Karin

[Peter · Accepted solution]

Nothing strange with the raw file more than that one of the embedded JPEG files is damaged, as you already know. 1620x1080px JPEG and 160x120px JPEG are good.

Extract them all with Exiftool

exiftool -a -b -W %d%f_%t%-c.%s -preview:all YourFile.CR3

Comparing the embedded JPEG with the raw file:

Full size embedded JPEG

Raw file with no demosaicing and no cropping of the left border

A brighter version of the raw file with no demosaicing and no cropping of the left border. Nothing strange in the masked pixels either.

[musicmaiden]

what a relief! thanks for the time and demonstration on what you did to check, Peter!!!