What does yellow tinting represent when using "color misaligned images" on iPhone/iOS

Question

so--i switched on "color misaligned images" to improve drawing performance in our app. The documentation states:

Puts a magenta overlay over images whose source pixels aren't aligned to destination pixels

I don't know what the yellow means however. (There is a "Color Offscreen-Rendered" option that uses yellow... does "Color Misaligned Images" also turn on this option?)

Anybody know?

TIA

Answer 1

Magenta overlays are caused by subpixel misalignment, while yellow overlays are caused by stretching. Prior to iOS 4, Instruments used magenta for both.