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View topic - RgbQuant-SMS - reduce the tile count of your images
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  Posted: Thu Aug 10, 2023 1:17 am
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About RgbQuant-SMS. I noticed Ordered2x1 is an command line option, but it is not available in the DithKern dropdownlist.
Is Ordered2x1 the super basic checkerboard dithering? I usually prefer that type of dithering. |
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Posted: Thu Aug 10, 2023 9:07 am
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Yes, I still haven't updated the site with the newer version, though it is already working on the command line version; then"Ordered2x1" pattern dithers between 2 columns of pixels, resulting in a vertical striped pattern that, hopefully, should look better on a CRT. 
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Posted: Thu Aug 10, 2023 11:08 pm
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BTW, I'm experimenting with using RgbQuant-SMS to create a Sega Genesis Video encoder/player
Experimental encoder: https://github.com/haroldo-ok/sgdk-video-player Youtube video with the experiment in action: |
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Posted: Fri Aug 11, 2023 8:13 am
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A genesis video player with SMS colors. Looking cool already.
As the normal Genesis palette does not have the correct SMS colors, are you going to switch to a mode with accurate SMS colors? About dithering i was actually referring to checkered dithering as in the attachment. At Imagemagick site they call it 2x1 or checks. https://legacy.imagemagick.org/Usage/bugs/ordered-dither/ 
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Posted: Fri Aug 11, 2023 9:38 am
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Yes, it would be better if the conversion tool could be able to use the Genesis palette; I started to implement that option, but something was overflowing, so I'm leaving that for later, since there is so much else to implement. If you want a checkered dithering, you could use the other "ordered" options, though they can produce artifacts on a CRT. |
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Posted: Fri Aug 11, 2023 5:48 pm
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Tiledpalettequant is explicitly RNG-fed. It picks a random palette entry and adjusts it to improve the quantization, many thousand times. |
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Version 0.2.1 is now available!
Posted: Tue Aug 15, 2023 10:03 pm
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Version 0.2.1 has been released; summary of updates since last version:
- Uses 3 times less RAM when converting; - Published as a npm package: https://www.npmjs.com/package/rgbquant-sms - Can be installed as an npm command: if you run `npm install -g rgbquant-sms`, you can call it anywhere as `rgbquant-sms`. |
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Posted: Fri Aug 18, 2023 9:40 am
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I downloaded and ran the demo locally, but it just throws loads of errors in the console. Am I missing something? Do you have a working online demo? Is the zip just missing jquery-2.0.3.min.js?
"Source map error: Error: NetworkError when attempting to fetch resource. Resource URL: file:///Users/andy/Downloads/RgbQuant-SMS.js-master/demo/js/jquery-2.0.3.min.js Source Map URL: jquery-2.0.3.min.map" Uncaught DOMException: The operation is insecure. getImageData file:///Users/andy/Downloads/RgbQuant-SMS.js-master/src/rgbquant.js:929 toRgbImage file:///Users/andy/Downloads/RgbQuant-SMS.js-master/src/rgbquant.js:725 sample file:///Users/andy/Downloads/RgbQuant-SMS.js-master/src/rgbquant-sms.js:42 process file:///Users/andy/Downloads/RgbQuant-SMS.js-master/demo/js/demo.js:107 mark file:///Users/andy/Downloads/RgbQuant-SMS.js-master/demo/js/timer.js:19 process file:///Users/andy/Downloads/RgbQuant-SMS.js-master/demo/js/demo.js:106 etc etc. Sorry if I'm missing something obvious here. |
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Posted: Fri Aug 18, 2023 9:56 am
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Yes, when you directly access a local HTML file, the web browser blocks a bunch of functionalities, for security reasons; it does not even allow reading the pixels of an image, when the page is run that way.. If you really want to run the demo locally, you would have to set up a local web server, then access the demo through that. |
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Posted: Sat Aug 19, 2023 11:11 am
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| Version 0.2.2 is optimized to run faster and use much less RAM if using a single palette. | |
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