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show user profile  STRAT

Hi chaps, take a close look at the above render sample.

It rendered beautifully, but after changing the shadow/highlight in photoshop i get this terrible banding all over the image.

I render out in 16 bit TIFF format and amend in 64BIT photoshop.

why is this happening, surely my 16BIT renders should stop all this completely?


read 412 times
1/7/2016 5:55:37 PM (last edit: 1/7/2016 5:55:37 PM)
show user profile  chillywilson
Is photoshop reading them as 8bit. go to image mode and see if it is on 8 or 16

[edit] also make sure your using 16bit adjustments.
read 401 times
1/7/2016 6:42:37 PM (last edit: 1/7/2016 6:43:42 PM)
show user profile  STRAT
mode is 16 bit.

how do i know if im making 16bit adjustments as opposed to 8bit then?


read 393 times
1/7/2016 6:51:46 PM (last edit: 1/7/2016 6:51:46 PM)
show user profile  chillywilson
sorry it's only AE that has 8bit only adjustments.
Can you dropbox a still I can take a look.

read 391 times
1/7/2016 6:57:03 PM (last edit: 1/7/2016 6:57:03 PM)
show user profile  STRAT

for instance, try shadow/highlight - shadows = 0 highlights = 100


read 384 times
1/7/2016 7:06:34 PM (last edit: 1/7/2016 7:08:23 PM)
show user profile  Error404
it looks like you're doing some sort of shadow enhancement, that operation may be causing the banding.

Do you see the banding before you output the JPG?

(edit) I don't see any banding on the TIF you uploaded. If you are workig in 16 bit in photoshop, you shouldn't see banding for most things. -

read 382 times
1/7/2016 7:08:04 PM (last edit: 1/7/2016 7:09:59 PM)
show user profile  STRAT

all rendering and amending is done in 16bit then saved down to jpg. this banding is from the shadow/highlights option in 16bit before jpg.

i didnt think 16bit should do this.


read 380 times
1/7/2016 7:08:53 PM (last edit: 1/7/2016 7:09:50 PM)
show user profile  Error404
if you crank on an image hard enough, it will band, but for most things you shouldn't see it. DO you see the banding before exporting? Try collapsing the layers to one layer before you save as JPG. -

read 376 times
1/7/2016 7:10:54 PM (last edit: 1/7/2016 7:10:54 PM)
show user profile  STRAT
yes. the effect is most visible whatever way i try it in 16bit before jpg. try it yourself in my file i posted.

i can see sooner or later even 16bit will band, but i wasnt expecting this to be honest.
is there a photoshop fix/workaround?


read 373 times
1/7/2016 7:12:36 PM (last edit: 1/7/2016 7:12:36 PM)
show user profile  Error404
hm... yea I see what you mean. It looks like it's the shadow/highlight tool that's causing it. If I crank the image around with curves (instead of shadow/highlight), I don't see any banding.

Try opening the TIF in ACR, and do the shadow/highlight adjustments in there? That might work out better. Give me a sec, let me try that. -

read 371 times
1/7/2016 7:13:26 PM (last edit: 1/7/2016 7:14:06 PM)
show user profile  STRAT


read 368 times
1/7/2016 7:14:34 PM (last edit: 1/7/2016 7:14:34 PM)
show user profile  Error404
camera raw.

filter > open with camera raw

ACR doesn't seem to cause banding when using the shadow/highlight sliders, but you don't have as extreme of an adjustment as the filter in photoshop does. I have a feeling it's the shadow/highlight tool. It's possible that the code for the S/H tool is internally doing some operation in 8 bit, or something else funky.

I'm not sure what a work around would be. -

read 366 times
1/7/2016 7:16:21 PM (last edit: 1/7/2016 7:19:28 PM)
show user profile  STRAT
when i render in 8 bit and jpg, the shadow/highlight tool is a nightmare, even on modest cranks, but i was disappointed to see it in 16 bit more and more too. a shame, as the s/h tool is almost a must for me

didn't think there were any bugs left to find in Photoshop ;)


read 355 times
1/7/2016 7:21:56 PM (last edit: 1/7/2016 7:23:10 PM)
show user profile  chillywilson
Yeah I'm not getting banding until I crank it way up the shad and highs.

You should stay off of image/ adjustments and use adjustment layers like curves and levels, I can crank everything way up and not get the banding then.

edit: maybe that was the 8bit side I was thinking.
read 346 times
1/7/2016 8:25:57 PM (last edit: 1/7/2016 8:27:06 PM)
show user profile  LionDebt
Were the walls damp when the plaster was applied? Also, your sea sponge looks radioactive, was it from Fukushima?
read 332 times
1/7/2016 10:20:27 PM (last edit: 1/7/2016 10:20:27 PM)
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