[Android] Using JPG for boxart shows weird colours

[zzedmore]

This commit https://github.com/libretro/RetroArch/pull/16806 added JPG support for Boxart. I tried this on two different Android devices (Phone and Retroid Pocket Handheld) but the jpg's seem to have weird colours --

It works fine on Windows.

Here is the source jpg example --

[gnubeest]

I'd have to double-check, but i'm 99% certain a very similar effect was happening for me (using png thumbnails autofetched from the server) whenever I turned on thumbnail bilinear filtering on rgui in the current iOS App Store build (which predates the jpg commit but may still be related).

EDIT: It happens for me in rgui when I set the thumbnail downscaling method from bilinear to sinc/lanczos3 without restarting. I haven't played with downscaler settings in any other menu. Are your jpegs a higher (or even lower) resolution than the pngs you've been using? This may already be reported somewhere.

[zzedmore]

I tried setting the Thumbnail Upscaling Threshold to different values but it made 0 difference. Not sure where 'Downscaling Method' is. The jpgs I use are 700 pixels on the longest side. Example one above (Alien 3).

[zoltanvb]

Reproduced by loading the image with the image viewer core, so the problem is probably in the platform specific jpeg handling somewhere.

[Denshadego]

Can confirm this happening on two devices on my end, using the latest stable build v1.20.0. Jpg files can be seen correctly outside the app.