Vignettes appear banded

JL
Posted By
Joe_leMonnier
Apr 19, 2004
Views
185
Replies
2
Status
Closed
Photoshop CS, lots of RAM

I am making some polygon vignettes of a rasterized Illustrator file at 350 dpi and can’t seem to get rid of the banding at the edges. Since the image is fairly flat, it is especially noticable .

Within Illustrator, I can get it to work pretty well using opacity masks but my client is on an earlier version that does not support this wonderful feature. So, I turn to photoshop (again) .

Thus far I’ve tried making layer masks and blurring them, adding a feathered "hole" on a layer above the image and even using a little noise on the layer mask. This last solution of adding noise produces a pattern in the knocked out regions that needs to be masked itself. All in all it seems like I am missing something here very basic, right?

Can anyone help?

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T
Todie
Apr 19, 2004
16 bit per channel might help (if you make the vignette from scratch in Photoshop), finer line screen and higher imagesetter resolution.

I think that Illustrator introduces its own noise to gradations but I’m not sure.
CC
Chris_Cox
Apr 19, 2004
Banding normally means that you’re seeing sharp edges — so adding a small amount of noise can help.

Blurring can actually make the banding worse by creating new sharp edges due to quantization of your display and output device — sometimes 8 bits/channel just isn’t enough.

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