slight gradient banding (non jpeg)

AE
Posted By
andy_engelkemier
Nov 7, 2006
Views
222
Replies
6
Status
Closed
I am just wondering the best solution to this problem. I’ve already converted to CMYK and 16 bit, which seems to be the best so far.

I have a gradation of pretty much a black object. Of course it isn’t true black. It goes from lets say 16-20 from right to left. And of course I see some pretty major lines.
This was originally a rendering from 3dsmax, but I got some nasty crackly lines that look alot more organic. I would much rather it be a fine noise that went across the whole thing.

What’s the best way to do this? Anyone know? It’s more a general image thing than a photoshop thing. It’s not that noticeable on most colors, but black is bad. It’s very smooth, so any slight noise is noticeable.

I used hdr once, so it was 32bit, but the files took too long to load at 4800×3200 pixels and I have 27 that I’d like to work on at once within one file as they all share some similar resources. Also photoshop only has a couple things you can do to 32bit images. Doesn’t help me much that I can’t even have layers while in 32bit. What a crock.

Let me know if there is a good way to get rid of the banding in a very slight gradation of a long range. Not sure if it’s possible, but thought I’d ask some of the experts (and expert wannabe’s who might be able to help too like myself).

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B
Bernie
Nov 7, 2006
Noise or dithering will reduce the banding
AE
andy_engelkemier
Nov 7, 2006
Is there a way to add noise Only in the areas that the bands connect within a threshold?

I don’t really want to add noise to the whole section.

Also, is there a filter that will allow for dither? The only way I can think of is to save it with something that uses dither, then copy that image back in. Using CMYK at 16bit Definitely helped a lot.
B
Bernie
Nov 7, 2006
Is there a way to add noise Only in the areas that the bands connect within a threshold?

Make a selection?

Using CMYK at 16bit Definitely helped a lot.

You would probably be better offworking in RGb and only converting to CMYK once all the work is done.
PF
Peter_Figen
Nov 8, 2006
With any kind of gradients, it’s almost always better to do them in the final color space, and use 16 bits per channel if possible.

You can add noise selectively using the History brush as different levels of opacity, painting it in wherever you want or need it. Sometimes it helps to make a Luminosity mask to help control where the noise is brushed in, sometimes a color or channel based mask, or maybe no mask at all.
B
Bernie
Nov 8, 2006
it’s almost always better to do them in the final color space

My experience is that it’s better to do them in RGB, but then I usually use the gradients as a starting point to add shading to an illustration and brush over them tons of times with a variety of tools.
AE
andy_engelkemier
Nov 8, 2006
I’m going to have to go with Peter Figen on this one.

My final output will be CMYK. 3dsMax renders to RGB, which is really why we use that. Also we usually create the image to double for use in video and ppt presentations as well. In this case, however, CMYK is more fitting.

I am aware that I can make a selection, but thanks. I just wanted to see if there was a more efficient way of doing it. I have 27 images to create and only have 1 more day to finish. I will finish on time, but I like to keep my work going as smoothly and efficiently as possible.

I’ve never really used the history brush before. Just one of those tools I never really researched. I always just assumed it was a brush to selectively paint "undo". I haven’t had a need for it yet. Thanks for the suggestion. I’ll look into using that.

Thanks guys.

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