Nuke would be doing the comp in linear light, whereas PS does it sRGB,
so you are probably looking at a gamma discrepancy of around 2.2.
On 4/30/14, 1:51 AM, Florian Einfalt wrote:
Sorry Deke, that doesn't work either. I have a feeling it is happening
on the PS side of things.
When I bring the PNG back into Nuke it looks exactly like the original.
Anyone familiar with Photoshop's alpha treatment?
On 29 April 2014 14:42, Deke Kincaid <[email protected]
<mailto:[email protected]>> wrote:
Maybe you have a straight alpha instead of a premultiplied one.
So try just adding a premult node.
-deke
On Tuesday, April 29, 2014, Florian Einfalt
<[email protected]
<mailto:[email protected]>> wrote:
Hi Deke,
thanks for that, did it just now and it doesn't change
anything unfortunately.
When does the sRGB LUT get applied actually?
Thanks.
Flo
On 29 April 2014 14:28, Deke Kincaid <[email protected]>
wrote:
Nuke needs to unpremultiply the alpha before applying the
sRGB lut and the premultiply it again. Did you check the
"premultiplied" box in the read node properties next to
the lut selection?
-deke
On Tuesday, April 29, 2014, Florian Einfalt
<[email protected]> wrote:
I have tried to use:
png 8 and 16 bit
exr 16bit float
tiff 8 and 16bit
Same behavior with all of them.
On 29 April 2014 12:20, Martin Constable
<[email protected]> wrote:
An obvios suggestion maybe, but have you thought
about moving your workflow to tiffs? Or exrs?
PNGs do not store info as floating point. They use
integers instead. This might be at the root of yr
problem.
On 29 Apr, 2014, at 6:56 PM, Florian Einfalt
<[email protected]> wrote:
> I tried both using 8bit per pixel and 16bit per
pixel. No difference unfortunately.
>
> Flo
>
>
> On 29 April 2014 11:51, Martin Constable
<[email protected]> wrote:
> Are yr pngs in 24 bit? That might help.
>
>
>
> On 29 Apr, 2014, at 6:45 PM, Florian Einfalt
<[email protected]> wrote:
>
> > Hello,
> >
> > I am having this problem with PNGs from Nuke
that I need to deliver in a Photoshop psd-file.
This specifically concerns the shadow pass of my
comp but generally there is a discrepancy on
everything that is not solidly opaque.
> >
> > My workflow is as follows:
> > - I write my 8-bit PNG out of Nuke using the
sRGB colorspace.
> > - When I open the rendered PNG in Photoshop I
assign the sRGB color profile and over a
'transparent' background the shadow looks to have
similar density to the one in Nuke.
> > - When I comp that layer over a white
background though, the shadow is suddenly more
dense than in Nuke. Also, there is a much harsher
fall-off in the shadow.
> >
> > Is this because Photoshop treats alpha
information differently from Nuke?
> >
> > I thought I can maybe counteract this by
additional grading in Nuke but even when I grade
the alpha gamma to 0.4545 in Nuke and then write
the PNG I get closer but not exactly to the same
result.
> >
> > Does anyone have a suggestion?
> >
> > Thanks.
> >
> > Florian
> >
> > --
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