Transparency scaling oddity

[Alph Tech / STUART]

Open a new image and delete everything (Select All -> Erase Selection). Now, select all again and transform it with Move Selected Pixels. The transparency in the selection will change from FFFFFF with 0 alpha to 000000 with 0 alpha (use the Color Picker).

[Rick Brewster]

So? The pixels are transparent. All color values with alpha=0 are equivalent. It could be 00BEEF00 and it would be fine. The mathematics involved actually require it to be 00000000.

[BoltBait]

Open a new image and delete everything (Select All -> Erase Selection). Now, select all again and transform it with Move Selected Pixels. The transparency in the selection will change from FFFFFF with 0 alpha to 000000 with 0 alpha (use the Color Picker).

Remember this: When alpha is 0, the R, G, and B values are undefined. That means the the system is free to modify them as it sees fit in order to simplify its work.