Time to bump this old thread again-
I am also having issues getting alpha to match between Photoshop and nuke.
Specifically, between
a) a single layer exported from Photoshop as a TIF with transparency
B) the Photoshop file in Nuke with a shuffle node to isolate the layer
The alphas just don't
Aha, problem solved after an afternoon of troubleshooting.
The layer in Photoshop was set to 98%! So that was why the flattened
exported layer just didn't seem to match quite right.
Cheers,
Jordan
On Oct 20, 2014 3:11 PM, Jordan O jorxs...@gmail.com wrote:
Time to bump this old thread again-
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
Are yr pngs in 24 bit? That might help.
On 29 Apr, 2014, at 6:45 PM, Florian Einfalt
florian.einf...@saddingtonbaynes.com 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
I tried both using 8bit per pixel and 16bit per pixel. No difference
unfortunately.
Flo
On 29 April 2014 11:51, Martin Constable jackyoungbl...@me.com wrote:
Are yr pngs in 24 bit? That might help.
On 29 Apr, 2014, at 6:45 PM, Florian Einfalt
florian.einf...@saddingtonbaynes.com 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
florian.einf...@saddingtonbaynes.com
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 jackyoungbl...@me.com wrote:
An obvios suggestion maybe, but have you thought about moving your
workflow to tiffs? Or exrs?
PNGs do not store info
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
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 d...@thefoundry.co.uk wrote:
Nuke needs to unpremultiply the alpha before applying the sRGB lut and
the
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
florian.einf...@saddingtonbaynes.com wrote:
Hi Deke,
thanks for that, did it just now and it doesn't change anything
unfortunately.
When
Photoshop is applying gamma to alpha. Nuke I believe does not. Try
selecting just alpha in PS. Apply levels and set gamma to 2.2
On Apr 29, 2014 9:34 AM, Florian Einfalt
florian.einf...@saddingtonbaynes.com wrote:
Hi Deke,
thanks for that, did it just now and it doesn't change anything
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 d...@thefoundry.co.uk wrote:
Maybe
The reason .4545 isnt the same is because sRGB doesnt have a gamma of 2.2.
Its a power curve and it more like 2.4ish if you are trying to reverse it
with a simple gamma. So you either accept the difference, use gamma 2.2
instead of sRGB or use 32bit tiff or exr.You shouldnt be applying or
One more thing. Under layers at the bottom is a fly away I forget the name
but in site it will say remove black matte. That is premult basically
On Apr 29, 2014 9:57 AM, Randy Little randyslit...@gmail.com wrote:
The reason .4545 isnt the same is because sRGB doesnt have a gamma of 2.2.
Its a
Thanks Randy.
Still no joy even after using the inverted ~2.4 gamma, and without applying
or converting in PS.
Also, Remove Black Matte doesn't do anything for me.
Seems like I need to figure out a workaround to approximate it.
On 29 April 2014 15:00, Randy Little randyslit...@gmail.com wrote:
Thanks, that gets me close at least.
On 29 April 2014 14:46, Randy Little randyslit...@gmail.com wrote:
Photoshop is applying gamma to alpha. Nuke I believe does not. Try
selecting just alpha in PS. Apply levels and set gamma to 2.2
On Apr 29, 2014 9:34 AM, Florian Einfalt
Photoshop is handling the blend modes with gamma correction while Nuke is
doing it in linear, try checking the Video colorspace on your Merge node in
Nuke and see if that matches what you see in Photoshop.
Cheers,
Diogo
On Tue, Apr 29, 2014 at 7:47 AM, Florian Einfalt
Oh diogo yes. Go into color prefs under edit menu on mac. See what
happens if you set blend rgb to gamma 1.0. But that only affects layers and
color but maybe its related? What colorspace is your photoshop in?
Probably for you it should be srgb. You shouldnt need to convert either
when opening
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
oops, sorry, Randy had already said the same - ignore me :)
On 4/30/14, 11:21 AM, Frank Rueter|OHUfx wrote:
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:
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