Gaussian blur banding

[IsabelAracama]

Hi

Just wondering if there's any known solution to this banding I get when I use the gaussian blur and stack several layers of it... it really looks poor and can't get rid of it unless I get rid of the blur itself.

 

Thanks

[Bri-Toon]

I apologize if I'm misunderstanding the issue. If I understand you correctly, you want to remove the rings and have the contrast between the purple and green smooth together. You might be better removing the blur and apply a gradient on a rectangle with transparencies covering the sky. Have the gradient be linear running from the bottom right corner to the top left corner. Have the top left corner be completely transparent which perhaps a purple. And have the bottom right corner about 65% transparency with a green.

[R C-R]

The general cause of color banding is not enough available color variations for smooth, undetectable transitions from one to the next. Typically, this is caused by too low a bit depth, which can be corrected by changing the document's color format from 8 bit to 16 bit. However, this will greatly increase the size of the file & may not always be necessary or desirable. As explained here, working in a wide gamut color space spreads out the steps between colors in different ways depending on rendering intent, so just changing rendering intent may produce acceptable results without resorting to 16 bit color, but this will depend on the range of colors actually present in the document.

[Pšenda]

Same topic.

 

3 hours ago, IsabelAracama said:

when I use the gaussian blur

 

Without using blur, is the gradient smooth?
In my experience, banding is already visible in the gradient, and the blur is only highlighted.

[IsabelAracama]

Hi Pšenda,

I am attaching before and after gaussian images. It really does not show any banding before the gblur. I also attached a close up. 

I read several people talking about gradient banding before, but I'd say this is due to the gblur as it really won't show the banding before applying it. Weird it looks so poor. Seems like nodody was really having this issue, other than the guy on the other thread you pointed me to?

Thanks!

 

[MEB]

Hi IsabelAracama,

This is because we apply dithering to the gradients but not to filters nor layer effects. I already have filled an improvement request for this but i don't know if it will be considered.

I'm moving this thread to the feature requests section. Meanwhile the only way to deal with the banding is adding some noise to whatever is causing it to help smooth it out.

[R C-R]

In File > Document Setup > Color tab, what does it show for Color Format? If RGB/8, does changing to RGB/16 make any difference?

[Pšenda]

2 hours ago, IsabelAracama said:

it really won't show the banding before

 

On my monitor is banding visible. It's not as obvious as applying blur, but seeing it.

Much depends on the brightness setting and the type of monitor (I tried it on three :-), so it can also be a display error.

The monitor just can not show such gentle transitions, and that's why it seems like a banding.

[IsabelAracama]

14 hours ago, R C-R said:

In File > Document Setup > Color tab, what does it show for Color Format? If RGB/8, does changing to RGB/16 make any difference?

It is way better now! 

 

Thanks a lot all of you!