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A comment on Optimizing a 6502 image decoder, from 70 minutes to 1 minute. Parent comment

Re:Optimizing a 6502 image decoder, from 70 minutes to 1 minute by bawolff on Monday September 29, 2025 @07:29PM (#45420146)
If i understand, the picture without black pictures is half the resolution at 320x240. That's small enough your browser might be upscaling it
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Re:Optimizing a 6502 image decoder, from 70 minutes to 1 minute by anyfoo on Monday September 29, 2025 @08:08PM (#45420423)
I just opened both pictures in separate tabs, the browser says that both are 640x480.

But that's a good point nonetheless: That 640x480 picture is certainly upscaled somehow, otherwise it would be absolutely tiny on a retina display. That upscaling might certainly lead to very different results from both images.

However, when I download the images and open them in Preview, I get the same result. When I zoom in, I do see individual pixels. It looks like it just did nearest neighbor upscaling, so I'm not sure upscaling is at fault here.

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