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PO
 

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  1. PO
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    <p>Have you tried something like <code>image.putalpha(mask)</code> to replace the image's alpha channel with the mask? This seems like it should do what you want. <code>mask</code> might have to be in 'L' mode for this to work correctly, and <code>image</code> should probaby be 'RGBA', but might be automatically converted for you.</p> <p>The top answer here provides some good examples: <a href="https://stackoverflow.com/questions/890051/how-do-i-generate-circuar-thumbnails-with-pil">How do I generate circular thumbnails with PIL?</a></p> <p>Your mask image looks fine, but I think you want to swap 'white' and 'black', so you have a white rounded rectangle exactly the shape you want your final image to be, on a black background. You will probably also need to use the 'L' mode (greyscale) one.</p> <p>Once you have this image, you can replace the <code>return ImageChops.add(mask, image)</code> by <code>image.putalpha(mask); return image</code> and this should cause the image to be transparent in only the black areas of the mask.</p> <p>You might need to convert the image first with <code>image.convert('RGBA')</code> but I think this is unnecessary in later versions of PIL, it does it automatically.</p> <p>Something like: (sorry can't test this right now)</p> <pre> def round_corner_jpg(image, radius): """generate round corner for image""" mask = Image.new('L', image.size) # filled with black by default draw = aggdraw.Draw(mask) brush = aggdraw.Brush('white') width, height = mask.size #upper-left corner draw.pieslice((0,0,radius*2, radius*2), 90, 180, None, brush) #upper-right corner draw.pieslice((width - radius*2, 0, width, radius*2), 0, 90, None, brush) #bottom-left corner draw.pieslice((0, height - radius * 2, radius*2, height),180, 270, None, brush) #bottom-right corner draw.pieslice((width - radius * 2, height - radius * 2, width, height), 270, 360, None, brush) #center rectangle draw.rectangle((radius, radius, width - radius, height - radius), brush) #four edge rectangle draw.rectangle((radius, 0, width - radius, radius), brush) draw.rectangle((0, radius, radius, height-radius), brush) draw.rectangle((radius, height-radius, width-radius, height), brush) draw.rectangle((width-radius, radius, width, height-radius), brush) draw.flush() image = image.convert('RGBA') image.putalpha(mask) return image </pre>
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    1. POhow to round_corner a logo without white background(transparent?) on it using pil?
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    1. USCommunity
    1. USmesilliac
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    1. CO,Please check out the link I added to see the problem.I don`t think the link U gave is what I am looking for and I am not sure what U said about alpha stuff..
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      1. USbdictator
    2. CO@bdictator the "alpha" channel is the part of the image that holds the transparency information. `image.putalpha(mask)` should replace only the transparency information with the mask image, where white mask colour means full opacity (no transparency - original image), and black means full transparency (totally see-thru). I'll try updating the answer to add some more detail.
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    3. COThanks a lot,but it seems the same with white stuff on the backgroud corner
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