Processing A Plane

[vcmohan]

In RGB32, RGB64 or Planar YUVA input values for A plane are available. I do not find any difference between RGB24 and RGB32 outputs in vdub. I am wondering with what location accuracy I need to process A plane. Is nearest neighbour enough? Adding one more plane ( for instance, in my plugins for rotation or reform or Barrel distortion) adds time for processing but seemingly it has no effect on output.

[Wilbert]

In RGB32, RGB64 or Planar YUVA input values for A plane are available. I do not find any difference between RGB24 and RGB32 outputs in vdub.
I thought that Virtualdub didn't do anything with the alpha channel. It's a good question though.

[shekh]

Alpha is almost entirely new in FilterMod only, before it did not exist.
But it is still ignored on avs source.

Is nearest neighbour enough?

IMO you have choice: process it the same as RGB/Y, or ignore it, or have and option.