for Tianocore, use the latter only. Needs to be a 24bpp windows BMP, no larger than the width of the screen and 75% of the height (the image is centered 38.2% down from top as per BGRT spec). Gimp can be used too but likely will have a pallette shift if a non B&W image used
Customer sent me a png image of the logo they want to use so have manipulated it using ImageMagick to give it a black background and convert it to a Windows 3.x format BMP at 24bpp. Not sure why but the first go converting it to a Windows 98/2000 and newer format failed.
Is there any reason not to use both with TianoCore? Does the CONFIG_BOOTSPLASH JPG file not spend long enough on screen to make it worthwhile using?
exactly this. On most devices, the payload will execute ~600ms after coreboot starts, and the image probably wouldn't start being displayed until halfway thru that. So it would be up for ~300ms and likely just appear as a flicker. Not to mention needing a different sized/formatted image than used for Tianocore
I tried putting a JPG image (400x400 pixels) into Coreboot but jpeg_decode() didn’t like it and returned ERR_HEIGHT_MISMATCH. I haven’t looked into the cause (and may not do if it really isn’t needed).
-Andy.