gamma correction in photoshop isnt working

[folkevall]

Ok, not really a Vray issue but...

So i've got two images. One without 2.2 gamma correction (image A) and one with gamma 2.2 correction burnt in (image B). But when i gamma correct image A in photoshop, the dark and midtones doesn't match image B. It's not just the difference between sRGB and a 2.2 gamma curve, the difference is quite huge.

However, when i gamma correct image A in fusion, it is matching image B perfectly...

So am i using photoshop wrong or whats the deal here?

p

[Dave_Wortley]

I too would like to know this....

[3DMK]

Don't know why but Photoshop doesn't convert/handle 32 bit files very well..[Maybe because photographers were a bit slow getting into HDR images????]
I use after effects with HDR Compander effect as it seems to do it properly.
Render your image unburnt [Gamma 1.0] & burn your gamma in post using AE [using HDR Compander effect - Expand range option] then save as 32 bit. Bring into photoshop & all should be right. Make sure you set your composition to 32bit in AE as well.
I find it best to render as linear gamma 1.0 because you can adjust your gamma in post for different situations such as Print or monitor. Using the above method gives you maximum flexibility.


Hope this helps

[folkevall]

Don't know why but Photoshop doesn't convert/handle 32 bit files very well..[Maybe because photographers were a bit slow getting into HDR images????]
I use after effects with HDR Compander effect as it seems to do it properly.
Render your image unburnt [Gamma 1.0] & burn your gamma in post using AE [using HDR Compander effect - Expand range option] then save as 32 bit. Bring into photoshop & all should be right. Make sure you set your composition to 32bit in AE as well.
I find it best to render as linear gamma 1.0 because you can adjust your gamma in post for different situations such as Print or monitor. Using the above method gives you maximum flexibility.


Hope this helps

Cheers

But it doesn't work even if it's 8 or 16bit.

I have to gamma correct in Photoshop since the composit will be done in photoshop. And that correction needs to be done just before final output..

/p