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No, alpha clipping refers to the amount of clipping applied to the alpha channel in the viewport (that is, what gets transparent and what gets solid in a face with an RGBA texture). "Premultiplied al …

*) Note that mixing two shaders (one transparent and an emissive/reflective one) to create a material with transparency based on a texture's alpha is a completely different procedure. …

If you're going to composite that effect using Blender's compositor, just try an alpha over on a colour to judge whether your image transparency is correct instead of relying on the RGBA view of Blender's …

If you intend to composite it over the background using a different software and not Blender's compositor, then you just have to save the result to a format that supports alpha transparency (EXR would …

Blender's 3D view has some problems compositing planes with alpha in OpenGL mode. You can mitigate those effects to some extent (by changing the alpha clipping in the preferences or the different view …

I understand that pre-multiplied alpha is sometimes good and sometimes bad, and that if used improperly it can result in dark borders where transparency tapers off. But that's about all I know. … It's actually the best way transparency can be expressed in an RGB file as it allows both occlusion and emission (that means that your foreground can both block and emit light). …

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 …

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: …

This is a tricky one, because you're going to deal with two separate issues that clash with each other. As @cegaton suggested, volumetrics could make things easier for you, but if you need to solve i …

I don't think it's possible to bake alpha directly, but you can try making a new shader mixing a white and a black emit shader together using the alpha of your textures as mask, then bake that into a …

Short answer It won't work. Your technique has a fundamental problem that I'll explain below, but even if your technique was correct, some limitations of Blender's viewport will make impossible to pr …

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 …

1) It is possible with the compositor. You need to pull a pass with the shadow catcher object only, modify its alpha and composite it. However, compositing back the foreground object with the shadow c …

Rendered passes should be treated as RGB and added/multiplied together (passes are light emissions from each component, therefor they have to be added together, with a few exceptions that require mult …

It's a viewer issue only. Try compositing over a gray background using the alpha-over node. If the result is correct, then your file output (without the gray background, of course) will be correct as …