Dyna Res and SHAM

[SamuraiCrow]

IIRC, the SHAM video format would only store vertical copper data for up to 200 pixels.  On PAL systems it was rather useless due to the lack of the other 56 pixels of vertical resolution.

Also, IIRC, the Brilliance paint program on the AGA chipset Amigas mixed copper palette changes with HAM8 mode to get their truecolor appearance.

[SamuraiCrow]

Since TGA has alpha-blending standard in the format, I doubt you'll be able to convert them to Amiga format easily.  Likewise if you start with a 24-bit image in BMP format you'll have to convert it to something else before the Amiga can use it since BMP started as a Windows-specific file format.

GifMachine might do what you want on the A500 assuming you have at least Kickstart 2.04 .  I just did a little searching on the Aminet to find it.  I've never used it myself.