CGTalk - OpenEXR Question

ruddiger52

01-09-2007, 09:04 PM

Hi,

I am rendering in openexr for the first time. I notice in my intial renders that the exposure looks high compared to rendering a targa. If I bring the exr into photoshop I can adjust the exposure. Adjusting the gamma in mental ray doesnt do anything. Is there a correct way to render an exr to match what was previously rendered in targa?

thanks

Chris-TC

01-09-2007, 09:49 PM

An OpenEXR should look identical to a TGA. I've never seen them look differently.

Depending on which program you open the EXR with you may end up with an automatic gamma adjustment. After Effects for example will always apply a 2.2 gamma to every EXR, thus making it look brighter than an identically rendered TGA.

techmage

01-10-2007, 12:15 AM

Ya, different programs will open the exr differently. Fusion and imf_disp are the only ones I've used that open an exr to look the same as it it did in mayas render view.

beaker

01-10-2007, 08:07 AM

What bit depth are you using? Tga only goes up to 8 bits per channel, where Exr can hold a 32 bit float image. If you are rendering at 16/32 bit float, then look into "Tone Mapping".

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