python - PIL paste image with alpha appears faded -


i working multiple images stack on top of each other create single image. however, in working them, i'm noticing if image has transparency (alpha != 255), part of image appears faded. if there no transparency, good.

i saved 1 of images working png , created small bit of code duplicates problem. essentially, i'm creating new image transparent background , pasting image on top:

from pil import image  img=image.new('rgba', (946,627), (0,0,0,0)) overlayimage = image.open('drawing.png') img.paste(overlayimage, (0,0), overlayimage) img.save('drawing-pasted.png')

when completes, drawing-pasted.png looks this:

drawing-pasted.png

but original drawing (drawing.png) looked this:

drawing.png

(images cropped manually show detail.) original image circles fill color has alpha value of 179.

has else encountered this, , doing wrong?

thanks much.

the background creating black , transparent original blue alpha of 179 have 2 pixels (0,0,0,0) , (0,0,255,179) assuming 100% blue - since pasting image in over background use alpha of new image allowing (255-179)/255 or 30% black. (n.b. alpha of background makes no difference since behind new image)

you use overlayimage.putalpha set alpha 255 start image rather black background.


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