regarding image file formats ..
one problem with .png is that it changes the palette indexes when converting, which might then cause a programming problem with the graphics engine
.gif on the other hand, retains the same 256 color palette as 256 color .bmp and retains the same transparency index
1024 x 1024 .gif about 561kb .. not quite the reduction of .png, but consistant indexed palette with .bmp
I think it's a moot point however .. try to buy a desktop HDD less than 250GB these days !
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