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Results tagged with compositing-nodes
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user 20594
Questions related to compositing nodes available for compositing render layers into final renders in the compositor.
17
votes
Accepted
Where do the white lines come from in my composite?
Those two images you're trying to composite together have "correlated" alphas. The Alpha over operation isn't the appropriate operation for this situation.
The solution is simple: you just have to ad …
- 2,230
10
votes
Accepted
Composite blur effect cut off at edges with transparent background
You can't do that with a PNG.
What you need there is to make some transparent pixels luminescent, and that's only possible with an associated (sometimes called "premultiplied") alpha channel.
PNG uses …
- 2,230
10
votes
Glow effect invisible on transparent background
Alpha compositing with associated (often called "premultiplied") plates allows luminescent transparent pixels to be composited.
You just need to make sure that you are saving to a format that allows a …
- 2,230
7
votes
Saving GIMP's Alpha Color values in Blender
PNG is an unassociated alpha image format, while Blender, as any other 3D renderer produce associated (often called premultiplied) alpha images.
To produce an unassociated alpha image using the compos …
- 2,230
6
votes
Accepted
Compositing: When to use premultiplied alpha?
When should one check the Convert Premul box on nodes that use alpha?
Only when you know that your image has unassociated (often called "straight") alpha. Or in other words, when your image's alp …
- 2,230
6
votes
Post-processing Lightsabers in Blender
There is just one trick for this kind of effects:
Scene-referred workflow. (i.e. using physically plausible values for emissions and forget).
Instead of going through so much contortions, the most ef …
- 2,230
3
votes
Compositing Layers Have Halos
You have that problem because the alphas of each plate are correlated, as the foreground doesn't overlap the background, it masks it out.
Solving it is not super straight-forward but it's quite easy: …
- 2,230
2
votes
Accepted
How do I composite a transparent texture over a masked Render Layer
Your "skydome" renderlayer is masked, and it shouldn't.
Remove the mask from the background renderlayer and the alpha over operation will produce the right result.
The skydome renderlayer should loo …
- 2,230
2
votes
Accepted
How to mask one image and layer it over another?
It's super easy. Just use the mask as the factor in a mix node.
*) Keep in mind that a masked mix will never look like a proper Depth of Field effect. If that's your intention, I'd recommend you to …
- 2,230