I want to display an RGBColor bitmap as an image
I have several functions that fill the bitmap.
also at some point I will add an alpha channel.

I need to extract non-zero pixels from RGBA Image. Code below works, but because I need to deal with really huge images, some speed up will be salutary. Getting “f_mask” is the longest task. Is it possible to somehow make things work faster? How to delete rows with all zero values ([0, 0, 0, 0]) faster?

I am getting a file not found error for my basic python script that interprets an image as a 2d array. This is the source code