GetRGBACharPixelData still get alphaChannel even after SetAlphaBitPlanes(0)?

Support
1

GetRGBACharPixelData still get alphaChannel even after SetAlphaBitPlanes(0)?

2

VTK uses RGBA buffers always. It was a choice made because RGBA buffers were more universally supported across most hardware drivers over RGB buffers at the time of the OpenGL refactor.

3

thanks.
So how to support RGB ? is there related API should be set in VTK?
after SetAlphaBitPlanes(0) VTK still use RGBA ?
and GetPixelData seems will return RGB buffer after SetAlphaBitPlanes(0).
moreover, Window2Image seems to ALWAYS return RGB buffer.