Are images in ILC_COLOR32 image lists alpha premultiplied or not? I'm getting conflicting information

Question

Very simple question here: Are ILC_COLOR32 Image Lists alpha-premultiplied or not? Various questions on Stack Overflow, like this one , imply they are; this wxWidgets bug , however, indicates otherwise. The only place where Microsoft actually says ILC_COLOR32 is used for alpha-blended image list entries doesn't say (and all ILC_COLOR32 's docs say about it is that it is a "32-bit DIB section", which, if I understand the BITMAPINFOHEADER docs correctly, technically does not contain alpha information; the top 8 bits of each color are ignored). Thanks!

Answer 1

您提供给ILC_COLOR32图像列表并从中提取的图像没有预乘的Alpha通道。