unfortunately, given the weird and complicated pipeline you used, when creating this image, ALL information is in the alpha channel (ONLY!).
so, needs a small detour to make it visible:
im = cv2.imread("platine.png", -1) # keep alpha
alpha = im[:,:,3] # extract it
binary = ~alpha # invert b/w
cv2.imshow("P",binary)
cv2.waitKey()
imho you should avoid anything with alpha in it, it only causes trouble.
you probably should try to change your pipeline, so it saves a single channel image, with black contours on white bg, instead of trying to mend it later like above.
Asked: 2018-03-22 11:16:17 -0600
Seen: 8,181 times
Last updated: Mar 23 '18
It shows nothing ? What does it mean? opencv is an image processing library It does not process alpha channel
please show your code. most likely, there's something simple missing, like a waitkey().
Well, your image is transparent. So when you display it, every pixel is either background (black) or black. That's why you don't see anything.
So how should I display it. I export a pcb file to pdf, and then I open pdf by office word2016, and then I save this picture to png file, and I can not imshow it .
you use word for image manipulation ? lol. that sounds bad.