Yes, absolutely right. Just making clear the distinction between dither and diffuse. Dither is always a local operation on a sample, diffuse is the spatial spreading to make the neighborhood more pleasant for humans.
I was reacting to the statement "images and audio usually use dithering in opposite ways". The article here is about error diffusion, but it's pretty hard to say whether adding error diffusion to the dither process is the 'usual' choice, for either images or audio. It's very very common to not use error diffusion in both cases.
Diffuse is more much important when the destination resolution is well above human perceptible just-noticeable differences. For example, going from 8 bits per channel to 1 bit per pixel, or for audio when going from 16 bit samples down to 8 bit samples.
Yes, absolutely right. Just making clear the distinction between dither and diffuse. Dither is always a local operation on a sample, diffuse is the spatial spreading to make the neighborhood more pleasant for humans.
I was reacting to the statement "images and audio usually use dithering in opposite ways". The article here is about error diffusion, but it's pretty hard to say whether adding error diffusion to the dither process is the 'usual' choice, for either images or audio. It's very very common to not use error diffusion in both cases.
Diffuse is more much important when the destination resolution is well above human perceptible just-noticeable differences. For example, going from 8 bits per channel to 1 bit per pixel, or for audio when going from 16 bit samples down to 8 bit samples.