Check your color clip settings. There's three of them:
RGB: The alpha is clamped to be between 1.0 and the maximum of the R, G, and B values.
ALPHA: The RGB channels are clamped between 0.0 and the alpha value.
RAW: No clipping occurs but it forces pre-multiply on.
You'll find them under "Active Effects" in the render/region options.
- ½
> -----Original Message-----
> From: owner-xsi(at)Softimage.COM
> [mailto:owner-xsi(at)Softimage.COM]On Behalf
> Of Benjamin Huber
> Sent: Monday, 31 October, 2005 15:30
> To: XSI(at)Softimage.COM
> Subject: alpha issues with EXRs used in a constant shader
>
>
> hi all,
>
> i'm using an EXR plugged into the colour channel of a
> constant shader. the EXR has no alpha. however, doing a
> render region and toggling between alpha and RGB shows that
> the RGB luminance is being used as alpha.
>
> i have no idea why, but i don't think it should be like that.
> other shaders don't behave like that.
>
> any ideas? i have a sample scene but it's kinda big (300k) -
> if anyone wants to fiddle around with it - let me know.
>
> thanks!
>
> -ben
>
> ---
> ben huber (x63291)
> bhuber(at)ilm.com
> ilm digimatte
> serious like ninjas
> ---
>
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