Color banding even with truecolor

Hi
I have a texture which looks fine in any image viewer, but has banding problems in unity.
I tried all the truecolor options, filter modes, and ansio levels. I set 32 bit in the player settings as well. It happens both with diffuse and unlit shader.

Any ideas why this happens and thoughts on how to prevent it?

http://mightyrobot.dk/files/banding.png

No one ever had this problem?

Seems like a texture compression issue. Did you try with 32 bit RBGA texture format?

Yes, i tried all kinds of compression. The screen shot is of 32 bit uncompressed textures. As you can see, i even tried dithering my gradients, but to no avail.

I suspect it could have something to do with the multiply shader. Maybe the rendering depth for multiply isnt adequate? But i dont know to be honest.

Have you altered the Quality settings in your project? (Edit → Project settings → Quality)

I have tried those settings, but no changes regarding banding.