🔒 blank png image (PIL) | Python | Page 1

tall axle Jan 12, 2025, 4:42 AM

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Hi, I have a weird issue where I save a png image, windows preview displays the image correctly while opening in an editor shows a blank image
code: https://paste.pythondiscord.com/MZMA
and yes, there is no errors

lethal acornBOT Jan 12, 2025, 4:42 AM

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tall axle Hi, I have a weird issue where I save a png image, windows preview displays the ...

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@tall axle

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spare pendant Jan 12, 2025, 5:38 AM

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interesting

tall axle Jan 12, 2025, 5:41 AM

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spare pendant interesting

indeed

spare pendant Jan 12, 2025, 5:42 AM

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why do you think that the preview is correct?

summer canopy Jan 12, 2025, 5:44 AM

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hm, hard to tell what the issue might be. is there perhaps some transparency issue (shown differently for some weird reason)? Maybe, just to see what happens, try to convert the image to just RGB before showing preview and saving the file?

spare pendant Jan 12, 2025, 5:44 AM

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all alpha values are 0.

summer canopy Jan 12, 2025, 5:45 AM

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okay... that would make it transparent, and the "blank image" would be the expected result, and the previews would be wrong.

spare pendant Jan 12, 2025, 5:49 AM

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not really wrong.. but a preview cannot be fully invisible. it has to show something. so instead, it shows as fully black. i think this is an extreme border case.

tall axle Jan 12, 2025, 5:50 AM

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spare pendant why do you think that the preview is correct?

changing the index, changes the pos of the pixels in the preview, like I am getting live update in the preview while opening in the editor just show a blank image

tall axle Jan 12, 2025, 5:50 AM

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summer canopy okay... that would make it transparent, and the "blank image" would be the expec...

that sounds abt right

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as I don't actually understand transparenty

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changing transparent to 255

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yup, png previews just don't support transparenty for some reason

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if I have an issue rn, it will be how calculate_position, calculates the pos, as it's incorrect

spare pendant Jan 12, 2025, 5:54 AM

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they support transparency. just can't be completely empty. at least one pixel needs to have a alpha between 1 and 255.

tall axle Jan 12, 2025, 5:54 AM

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spare pendant they support transparency. just can't be completely empty. at least one pixel ne...

0 is not a thing?

spare pendant Jan 12, 2025, 5:55 AM

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if every pixel has an alpha of 0 then there is no image.

tall axle Jan 12, 2025, 5:55 AM

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right

spare pendant Jan 12, 2025, 5:58 AM

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i think that might be hard-coded somewhere in the preview generator. "if there is no image then display a black area instead."

tall axle Jan 12, 2025, 5:59 AM

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tall axle if I have an issue rn, it will be how calculate_position, calculates the pos, as...

okay solved

def calculate_position(index: int) -> tuple[int, int]:
    width = image.width
    row = index // width
    col = index % width
    
    return col, row

had to switch col and row

spare pendant Jan 12, 2025, 5:59 AM

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both look fine.

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:)

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ü

tall axle Jan 12, 2025, 6:00 AM

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spare pendant \:)

fair enough

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now time to add math 🙃

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!solved ty everyone

lethal acornBOT Jan 12, 2025, 6:01 AM

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#🔒 blank png image (PIL)