OTOY Forums

Parade and neonZorglub, how do I save a "responsed" image as a 32bit EXR ?

richardyarlett wrote:Parade and neonZorglub, how do I save a "responsed" image as a 32bit EXR ?

Hi Richard,

As far as I understand, I think you can't.

A 'responded' image can be saved as 32bit EXR, but values will be clamped in the range [0.0, 1.0] (sRGB)

In Stand Alone, if you save as EXR, you have the option to 'Force tone mapping', but you it needs to transform values to the [0-1] range..
As the tooltip mention:
"Whether to apply Octane's built-in tone mapping (before applying any OCIO look(s)) when saving a render result in a color space other than sRGB. This may produce undesirable results due to an intermediate reduction to the sRGB color space."

In 3dsMax, the same option 'Force tone mapping' is in Kernel / Passes output, when saving as Octane EXR.

To keep full floating point range ('unclamped' / linear), disable 'Force tone mapping' for saving as Octane EXR.
And in the lastest plugin versions (12.22 / 13.04), I added a 'Force linear' option in the imager, for saving as 3ds max EXR.
viewtopic.php?f=27&t=80190
You can also use the pixel color display to see the floating point rgba values..

But both way will disable any tone mapping..
That's the way Octane process the image, and I guess the way the math behind it works, as elsksa mentioned.

So if I were to save an LINEAR, is there a good post rendering technique in PS to apply TONE MAPPING there ? Is there a plugin you are using to apply the same "response" curves in PS ? Because LINEAR is too harsh for me. I like a softer, warmer look.
When I reduce the highlights by turning on HIGHLIGHT CLIPPING to 1.0, even in LINEAR, it shows in the viewer, but it does not affect the RAW EXR. It still comes with HOT highlights. Is that a bug ?