user interface - Bitmaps in OS design -


i have unusual question adding graphics os gui.

when use resource viewer see there few different versions of 1 graphics in same file, take example windows xp start menu bitmap:

enter image description here

there 1 graphic mouseover, 1 clicked, , 1 clicked. question, 3 in total.

my question is, how display 1 graphics though there 3 in file? here real life screen shot of mean:

enter image description here

also when view bitmap resource, has pink there whitespace, reason too?

it no big deal display desired part of image depending on state.

as said in comments, color can reserved indicate transparency which, depending on viewer, can rendered differently.

when progressive transparency supported, need alpha plane instead.


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