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I am trying to work with some gradients but I always see visible stripes in the shapes.
Is there a way to make the gradient more smooth?

ah yes, the limits of 8bit...
you can add a bit (like 4% or a similar low value) of spread in the gradient settings this reduces the banding effect, but adds some grain.

Peter Wassink wrote:you can add a bit (like 4% or a similar low value) of spread in the gradient settings this reduces the banding effect, but adds some grain.

This helps but it adds grain as you said.
I think we need the option to add an additional stripe between each stripe in the gradient. I don't know what this means in bit language (16bit gradients?)

Right now, we cannot do anything (we cannot simply change TVPaint from 8 bit to 16 bit).
However, in the future....

Elodie wrote:we cannot simply change TVPaint from 8 bit to 16 bit

I did not realize that you would have to change the whole program.

For now I find that if you use a little bit of spread and then smooth the shape it also gives a good result.

The problem with "banding", as it's called, is that no matter how much you try to smoothen it in TVP, or even use a 16bit program, in the end you'll have a video file which in most cases is encoded with an 8bit codec, thus you'll get artifacts much worse than banding.