alpha with images?

Patryk Rebisz wrote on 1/4/2010, 8:34 PM

Is it possible to bring in a still image with alpha channel into vegas so i could composite it over another image? If so what kind of format do i save the image in?

Comments

Grazie wrote on 1/4/2010, 8:39 PM

PNG!

Grazie

Grazie wrote on 1/4/2010, 9:00 PM

I missed this out: You must also TELL VEgas it has an Alpha channel by getting into the Media's Properties and set the "Premultiplied" option.

Grazie

Patryk Rebisz wrote on 1/4/2010, 9:56 PM

Thanx!

rmack350 wrote on 1/4/2010, 10:30 PM

Both PNG and PSD files will support 8-bit alpha channels. 8-bit alpha allows for semitransparent areas - especially useful for soft edges.

I don't have the link here but there was a good article on the Cow about alpha channels and mattes, explaining the differences between straight, premultiplied, etc, and especailly explaining how to get photoshop to recognize the type of alpha channel that Vegas exports.

Rob Mack

pplambeck wrote on 1/4/2010, 11:29 PM

maybe that helps a bit:
http://library.creativecow.net/articles/rabinowitz_aharon/straight_vs_premult.php

Rory Cooper wrote on 1/5/2010, 3:04 AM

Grazie do you still have that script with right click and edit in graphics editor?

Rory

rs170a wrote on 1/5/2010, 4:17 AM

Rory, it's called Open in Graphic Editor and is on Gilles Pialat's (aka Rosebud) Free scripts for Sony Vegas page.

Mike