How to remove banding from exported images (png, tiff) from illustrator layout with gradient

is there any way to remove or reduce banding that I am getting in a layout I've done that contains a gradient? I am exporting raster images (png or tiff) and there is a noticeable stepping of tonalities, rather than a smooth shift
thanks

In an 8bit format like PNG you only have 1024 unique levels...
1024 is 10 bits. 8 bits is 256.
But PNG is an RGB 8-bit per channel format. That yields 256^3 (i.e.; 24-bit or 16.7 million) potential "levels" (colors).
...banding that I am getting in a layout...
Banding that you are getting where?
What are the specific color values involved?
What is the final use?
What will be the distance across the gradient in its final use?
You have to consider whether the banding is actually in the raster image, or if it is merely an artifact of where/how the image is being viewed.
Banding is not a simple matter of image color depth. Banding is a device-dependent phenomena. The banding you see on your monitor is not the same banding that will be seen on your grayscale laser printer; is not the same banding that will be seen on your CMYK inkjet printer; is not the same banding that will be seen on press. Banding in print is generally more a function of levels of gray (per separation) of the imaging device, and can vary depending on the halftone ruling (assuming conventional AM screening).
Depending on the answers to the questions above, you may very well be fretting over nothing.
JET

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