Photoshop: What algorithm does Photoshop use for Diffusion Dither under Image->Mode->Indexed Color?

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Does anyone know what algorithm Photoshop uses for Diffusion Dither under Image->Mode->Indexed Color? I always thought Floyd–Steinberg dithering was the best error diffusion algorithm, but Photoshop's is much better!
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nullbyte

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Posted 7 years ago

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Chris Cox

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It's a modified Floyd-Steinberg algorithm. There are many published variations.
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nullbyte

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Thanks for your fast reply! Can you say which variation or is that a secret?