How to avoid white border in Corona Renderer?

Corona Corona for Cinema 4D Help Required
1

Hi all

I do get at Corona Renderer when using alpha channel (PNG) a white border after rendering.

I did watch some videos which mentioned in the render setting to select “direct visibility override”… but it doesn’t help.

Any ideas?

Many thanks

Mike

11-06-_2022_11-52-29.jpg
11-06-_2022_11-52-29.jpg924×773 21.9 KB

2

If this static, then Photoshop has this technique:
Ctrl+click by layer > Invert selection - Ctrl+Shift+I > press 2-3 times Del.

3

Straight Alpha… ?

StraightON.jpg
StraightON.jpg792×688 194 KB

4

Hi and Thanks

@aler, this is a solution, but it looks after that it looks very pixelated.

@burnin, I have selected “Straight Alpha” in the render setting now, but I still see the white border. Do I have to consider something else?

Is there not a out of the box solution for this problem in Corona renderer?

many thanks

Mike

5

It’s not a corona thing, its a C4D thing, saving out transparent PNGs out of the picture viewer is a very hit and miss thing. Just add the alpha as a render layer and then make it transparent in post.

6

Upscale/downscale, super-sample, feather… Such is nature of alphas, filters, samplers, tone mappings, passes and apps one uses to compose perfection in detail.
Have you looked into cryptomatte pipeline to ease the pain?

7

Thanks!

@ficdogg, Is there a tutorial how to do so?

Many thanks

Mike

8

Perhaps, this might help?
https://support.chaos.com/hc/en-us/articles/4528578885649-Objects-with-opacity-maps-are-becoming-gray-when-they-are-far-away-from-camera-

9

https://youtu.be/RR_PEZf4T4I

10

thanks ! you saved me :smiley: