Bernie

The image converter no longer works for me:
c64.superdefault.com/

Perhaps it's because now browsers require https to upload files? Tested on both Firefox and Chrome...

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Bernie

Anyone knows an offline image converter? It's for... work.

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Christian Horn

@codewiz When I was searching for one, I ended up instead looking at instructions on how to accomplish that with gimp: reducing resolution and the colours does it. Should also be doable with Imagemagick.

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Bernie

@globalc I'm trying with ImageMagick:

convert bernie-thumb-square.jpg -scale 160x160 -dither FloydSteinberg -remap c64_palette.png out.png

but the result looks too "good" for the :

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Bernie
Follow

In part, it's because nobody was doing Floyd–Steinberg dithering back in the day (ImageMagick doesn't have a lot of options).

In part, it's also because the was constrained to 4 colors per character cell in multicolor mode.

@globalc @root

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Bernie

@globalc @root Without dithering at all, it also looks wrong (any artist would have used some dithering):

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Christian Horn

@codewiz @root
First result looks to me already like from a c64 demo. Maybe shirt sticks out a bit - mastodon cuts that off at the preview of the pic.

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Bernie

@globalc @root I could make an animgif version using 60hz flickering to create intermediate color shades!

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Christian Horn

@codewiz @root
Would be a nice hack, but effectively blow up file size, and look like a much smaller version of the image with the direct intermediate colors..

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Tommaso

@globalc @codewiz Finding someone who uses c64 dithering is harder than I expected. it's a lost art... There's no reason to use one-dimensional error diffusion anymore. Resetting the error for each line seems funny these days

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Bernie

@root @globalc Maybe there's some C64 image viewer that can read and display a bmp or gif file?

If I can find a good one, I'll use it to load my mugshot and then take a screenshot 😏

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Christian Horn

@codewiz @root
I was thinking the same.. or maybe there was an "established" picture format for the c64, aimed at efficiency for the c64, converting to that could also help.
bmp spends 3 byte per pixel, that's crazily much for what the c64 can actually do.

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Bernie

Wow, there was even a jpeg decoder...
...and it's blazingly fast! 😲
youtube.com/watch?v=E-QmrBdk2z

@globalc @root @mike @patrick

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Bernie

First time I hear of this SuperCPU... it's an accelerator card for the C64 based on a 20MHz 8/16-bit processor with a 6502 backwards-compatibility mode:
en.wikipedia.org/wiki/SuperCPU

@globalc @root @mike @patrick

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Christian Horn

@codewiz @root
btw, this reminded me of that quote I got from somewhere, "the whole moon landing was done with less computing power than 2 c64 deliver.."

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