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kornelski / undither

Smart filter to remove Floyd-Steinberg dithering from paletted images
https://lib.rs/undither
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Another undithering technique called mdapt #1

Closed RyanBram closed 7 years ago

RyanBram commented 9 years ago

Hi, Kornel.

I just want to inform you about another technique of dedithering. It is called mdapt which stands for merge dithering and pseudo transparency. The algorirhm is created by an author with an alias sp00kyFox.

The comparison image is as follow: Nearest neighbor Nearest neighbor Mdapt + xBR Mdapt + xBR

As you can see, there are many difference with those picture, especially in the health bar which is looked as semi transparent.

The explanation about algorithm can be found in http://libretro.com/forums/threads/340-mdapt-amp-gdapt-dithering-treatment-Updated-06-06-14

kornelski commented 9 years ago

Thanks for the tip. The tool looks really neat.

However, I don't think that's applicable to my program. The problem I focus on is recreating photorealistic images that have been converted to palette with floyd steinberg dithering, basically the reverse of pngquant. FS dithering doesn't have regularity that mdapt looks for. Images with automatically generated palettes don't have such fine-tuned high contrast edges that are suitable for line detection and enlargement.