Whether to use a V4 BMP header for the given color type. Different software have different standards regarding alpha without a V4 header. ImageMagick will write BMPs with alpha without a V4 header, but not all software will read them.
See Implementation
Whether to use a V4 BMP header for the given color type. Different software have different standards regarding alpha without a V4 header. ImageMagick will write BMPs with alpha without a V4 header, but not all software will read them.