I would say every format the reader is capable to show in "Pictures"
For sure *.jgp and *.png are supported.
Graphic will be scaled, so no need for a special resolution. But 600x800 will work best.
PS: this is specifically for PRS 300/505 (600) and custom build firmware from current repository.
Standby-Pictures should be placed in (Data)/database/system//PRSPlus/wallpaper (where Data is the root of internal memory)
and if used with landscape-mode, rotated versions in wallpaper/landscape/
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