16-bit radial spin blur problem in PS CS4?

JB
Posted By
Jeff_Buell
Sep 25, 2008
Views
367
Replies
5
Status
Closed
I first saw this problem in CS2 (Windows XP, Intel P4). The radial spin blur filter introduces pixel noise at about the 8-bit level, which is horribly bad if you’re expecting a smooth result out to 16 bits. It can be seen by taking a 16-bit image, applying a radial spin blur (10 degrees is fine), and then bumping the contrast way up (say using levels 125 to 130 in an area that’s around 128). Zoom in to see the pixels. The image should be completely smooth but instead you’ll see random dots all over. This problem was reproduced by somebody at Adobe during the CS3 beta with a promise that it would fixed for the release, but it wasn’t fixed. My question: can somebody try this in CS4 and tell me if the problem has/hasn’t been fixed? How about with a 32-bit image? I don’t want to be suckered in to buying CS4 like I was for CS3.

Thanks for your help,

Jeff
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M
Mylenium
Sep 25, 2008
It’s better in 32bpc, but not in 16bpc, I’m afraid.

Mylenium
CF
chris_farrell
Sep 25, 2008
but it’s not out yet……..
MV
Mathias_Vejerslev
Sep 25, 2008
The dots are there if you use the ‘good’ setting, but not if you use ‘best’.
JB
Jeff_Buell
Sep 26, 2008
Whoops, confused the announcement with availability. I assume Mylenium and Mathias used the beta. Mylenium, did you see the problem with the ‘best’ setting?
M
Mylenium
Sep 26, 2008
Yes. The dithering is a designed part of the effect, but it seems to calculate the pattern strictly in 8bit, not respecting subtler levels in 16bit. The better quality in 32bit is merely a byproduct of the overall better blending calculations. If you really need this often, it would be smart to investigate the plugin market for alternatives or learn After Effects… 😉

Mylenium

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