How to save a PNG with an alpha right or fat?

Long story short, work in broadcasting and a new piece of equipment like the png files.  I know how to save png with transparency, is not the problem.  I don't know how or if this is possible is to save with an alpha right or fat.  At the moment we feather or extend the edges to past the alpha to say a logo and save it as tif, psd, or .tga.  This way once it is indexed on video or something else, the edges look good, no bad black border... it is logical, explaining probably not very well.   But move to png files, I have no idea how to do an alpha right or fat because he sees the transparency.  I mean that if I have feathers on the edges, a png will see this right, since there is no alpha?

I hope this makes sense?

> If we don't fill the transparent areas and semi-transparent image with the colored part of the image, we have usually get a dirty key/matte or a lot of fringes.

This means that your other software and hardware is not reading/interpretation of the PNG file correctly.

PNG saves with everything that is in the pixels in the transparent area - because they are supposed to be transparent and not seen.

If you see artifacts in the transparent areas, then something is wrong with the software displaying the PNG, because 100% transparent should not be visible at all.

Almost, it looks like someone could not read the documentation and specifications and try to treat the PNG as premultiplied format.

Tags: Photoshop

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