Chaos Corona for Cinema 4D > [C4D] General Discussion

Multiplied alpha

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piotrus3333:
is the image you attached a crop from your render?
are you rendering on white background??

LeSill:
The image is a Photoshop composition. The object was rendered with alpha and composed with the background in Photoshop. The object sits on a plane, and in addition to standard lighting, I used HDRI/SKY lighting to create ambient lighting. I will try to disable visibility of the sky. It might help.

piotrus3333:

--- Quote from: LeSill on 2025-03-05, 09:11:14 ---The image is a Photoshop composition. The object was rendered with alpha and composed with the background in Photoshop. The object sits on a plane, and in addition to standard lighting, I used HDRI/SKY lighting to create ambient lighting. I will try to disable visibility of the sky. It might help.

--- End quote ---

black background is a must.
also look at photoshop settings and make sure alpha you are using is saved correctly (for example by default corona for 3dsmax saves alpha to integer colour file formats with wrong gamma - attached)

LeSill:
Thank you for the tips. It looks really promising. The EXR format, in particular, appears to provide a simple solution to the problem.

LeSill:
I tried saving the image as 16-bit EXR (it's a shame we can't save CXR 16-bit from VFB) and opening it in Photoshop with the EXR IO plugin, but it always opens as 32-bit, so any conversion to 16 or 8-bit affects the colors. It is a little irritating. Is there a workaround?

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