Noise behaviour

[Art48]

Hi,

I seem to notice that since 3.3 you need a much lower noise threshold (0.003 instead of 0.01) for a "similarish" noise compared to 3.2.
Meaning I have to set my thresh lower than before to achieve the same amount of noise. Is that true? If so why does it behave that way? Not complaining, just curious.

[joconnell]

They've changed what the number means. It used to be based on float values of colour difference, now it's a percentage instead so the two numbers aren't directly comparable.

[Art48]

Ah okay, that does make sense.

But what exactly does it mean then? 0.01 = 1% difference? If so the noise still seems a bit strong for 1%. But that may be just my eye.

[joconnell]

Yeah that's it although lele can confirm better. I think that's why 0.005 is the new default in it? If you consider that a normal 8 bit image has 255 levels of colour and 1/255 = about 0.004, having a noise threshold of 0.01 allows a colour to move upwards or downwards by two colour values - that might end up a bit flickery / noticeable on the move.

[Art48]

Makes sense. Thanks for the clarification.