Codec problem/error with CR3 files of EOS R5 Mark II

[hanswkraus]

Hi, "imatch_licensed_2025_4_4_x64.exe" shows thumbnails of CR3 files from my EOS R5 Mark II in pink and pale, see the appended (partial) screenshot. Thumbnails of CR3 files of my EOS R7 are displayed OK. I have done (with no avail):
1. Uninstall and reinstall IMatch, force update per Ctrl-Shift-F5
2. Set "Prefer photools.com RAW processing to yes" in application settings,  force update per Ctrl-Shift-F5
Kind regards, Hans

[Mario]

Both WIC and LibRaw report that the images don't contain an embedded preview. Hence IMatch is forced to "develop" the RAW data, which produces whatever WIC or LibRaw deliver. Bot are not RAW processors, obviously. That's where all the research and development from DxO, C1 and Adobe steps in - producing a neat image from the RAW Bayer matrix in the RAW data.

Did you disable the option to store a preview with the RAW in your camera?
If you shot RAW + JPG, you can make the JPG a visual proxy version.