[4 HeRo]

I always save out renders to 32 bit hdr format. Then you have the most color depth to work with in Photoshop. When you save out as png, it is 8 bit.

Haha bloody good tip mate thx

[tom]

Yes, saving HDR and converting to LDR in PS would help.

[simmsimaging]

Looks more like straightforward gradient banding to me. 32bit might help, but I suspect you may still need to add a bit of noise in PS to get rid of it.

b

[Brett Morgan]

Thanks for the info Brett, googled the problem and it was suggested to add noise to thr red channel for best results, can i avoid the banding at all? Even rendering to a 32 bit format it sticks out a lot, then i only want the background to look smooth not the model.

Cheers

Brett

[tom]

Brett, do you mean saving HDR and converting it down to 8 still has banding?

[Brett Morgan]

Hi Tom, yeah I can still see it in my hdr render, not as bad as my first jpg but its still noticeable to me, maybe i look at computer screens too long...


http://rapidshare.com/files/129659162/A ... L.hdr.html

Cheers

Brett

[tom]

Brett, here's how:



Maybe you don't have this option checked in PS?

[Kabe]

Just as an addition to Tom's tip, which should solve the issue:

For a greyscale gradient there are only 256 shades of grey in 24 bit... this is clearly not enough for smooth gradients, and therefore you'll see that kind of gradients on a lot of occasions, even with real digicam images!

Kabe

[Brett Morgan]

Thanks very much for your help guys, greatly appreciate it

My shout guys



Look no gradient banding on this one..

Tom when you add noise, is it to the whole image, or just to the red channel?

Cheers

Brett

[tom]

Tom when you add noise, is it ti the whole image, or just to the red channel?

No, I do not add noise. The procedure is:

1) Set HDR file as render output.
2) Open HDR in PS
3) Image / Mode > 8 Bits/Channel

Other than PS, you can consider Qtpfsqui as a free option for tonemapping HDR images:
http://qtpfsgui.sourceforge.net

P.S. Thanks for the beers!

[Brett Morgan]

Thanks Tom, sorry been a very long day, brain has switched off!

Brett