what does the 3rd parameter of returned array.shape mean?

[进陆]

imageio.imread('./test-24bpp.jpg').shape returns [height, width, 3], so I think 3 means there are 3 uint8-2d-array(i.e., R/G/B)

but
imageio.imread('./test-8bpp.bmp').shape returns [height, width, 4], what does 4 means?
imageio.imread('./test.gif')[0].shape returns [height, width, 4], what does 4 means?

Thanks

[Almar Klein]

If shape[2] == 3, then it means RGB, if it’s 4, it means RGBA, the fourth element is the alpha (transparency).

 

Regards,

  Almar

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