You shouldn't let PS apply 2.2 gamma when you take in linear images, you should keep them linear.
On Mon, Jun 3, 2013 at 6:07 PM, Christopher <[email protected] > wrote: > For a program that cost $1K such as Ps it's quite restricted for this type > of work, I still wonder why I have a zillion color profiles in Photoshop. > I imported the levels as linear gamma, but upon import in photoshop I let > photoshop apply sRGB (2.2 gamma), I suppose I shouldn't. You make it sound > as though I will fight will Ps to get things right, although you probably > are right :) > > I'm going to do the comp all in linear, see what results I get. I need to > find an alternative to Photoshop, Nuke I don't use here. Is AE more better > then Ps, or more of the same ? > > ::Christopher:: > > [email protected] wrote: > > > If the above is correct, what is ticking me off is it is so dark, > when I render in the renderer, it's nice,... > > are you looking at it with proper gamma correction? > oh right it’s photoshop... > > well, in XSI you are probably seeing the linear image with a gamma > correction added (which is the desired way to work) – but most other > software will show it without gamma - So if you add a gamma of 2.2, chances > are it will look like what you expected. > But here’s the twist: you should not be using that gamma – first do the > comp and add it in the end. Or actually – better not add the gamma at all > and rather export the image to the correct target color space. > > > Photoshop 'add' blend mode doesn't work in 32-bit color space, what is > the correct alternative ? > > Nuke. > > Really – you can’t expect to use Photoshop for a comp like that and have > the same result as in the renderer – it has the maths all wrong and doesn’t > even know how to handle an alpha. > What you’re trying to do will work correctly the first time around you try > it in nuke (ok – perhaps that’s wishful thinking) > > Add (or Plus in Nuke terms) is the one and only proper blend mode to use > - it’s called linear dodge or something senseless like that in Photoshop I > think. > > Screen is not correct - though handy at times, it will never give you the > same result as in the renderer. (except for the speculars in the mr skin > shader – but that’s another story) > > Seriously – photoshop isn’t worth all the pain for this kind of thing. I > know it might sound harsh but that’s just how it is – photoshop will not > work the same way as the renderer. > If you just want to mess around with some layers and make something > whatever – I guess you can use photoshop – but if you want to get the same, > correct result, as in the renderer – don’t use photoshop. > If your client wants to receive a layered photoshop comp... then though > luck. > > -- Jens Lindgren -------------------------- Lead Technical Director Magoo 3D Studios <http://www.magoo3dstudios.com/>
