Png Image 4 Channels. Wherever there is white the image is opaque. Black and white an alpha channel is newly added and if rgba or la the original alpha channel is updated.
Where there is black it is perfectly clear like a transparent png. Png supports palette based images with palettes of 24 bit rgb or 32 bit rgba colors. The fourth channel is an alpha channel.
Unlike png tiff s alpha channel may be of a different bit depth from the main image data in fact every channel in a tiff image may have an arbitrary depth.
Where there is black it is perfectly clear like a transparent png. I have a 4 channel image rgba. How to set transparent background to grabcut output image in opencv c. How to use image putalpha the parameter of putalpha is only alpha as it is literally put the alpha channel layer to the original image.
