Transparency problems

klaas-h wrote on 11/30/2018, 11:51 AM

I have a number of .png files that have a partly transparent background. I have put some on the timeline of Vegas 15 Pro and changed the alpha channel to "premultiplied". Then the images have the transparent parts that I want. The problem is that I have a large number of images that make up the track-video and to change the alpha channel setting on all the images is a lot of work!

Therefore I hope someone can tell me how I can easily change this in a few clicks or so. The copy/paste unfortunately does not work for this setting and I cannot find the right compositing mode of the track for this to work (if there is any).

Another thing I tried is to join all images in an AVI file with virtualdub and put it in Vegas on the timeline but I cannot get this to work for transparant backgrounds. The video does not seem to be transparent.

I've been reading in this forum but cannot find a way to make it work.

Any suggestions?

Comments

Marco. wrote on 11/30/2018, 11:55 AM

For PNG there should be no need to switch any setting to maintain transparency.

Any chance to share such a PNG so we could download and take a closer look into it?

klaas-h wrote on 11/30/2018, 12:09 PM

Hi Marco!,

Thank you for reaching out to me this fast ;-). You can pick a PNG here : https://drive.google.com/file/d/1JrrqTDDwKGVrYiUapvdrcYBx_OE85amI/view?usp=sharing

Eagle Six wrote on 11/30/2018, 1:30 PM

klaas,

If you select all the PNG files you have loaded in the Project Media Bin, then right click on any of the ones selected, then click on Properties, you can select Premultiplied from the Alpha Channel selection and all the clips that have been selected will change. That is a work around that may be useful.

Marco. wrote on 11/30/2018, 1:38 PM

Yes, that should work. Though with your files using alpha channel mode "Straight/Unmatted" seems to work better/cleaner.

Eagle Six wrote on 11/30/2018, 1:40 PM

Also, I took your sample PNG cube put it in PaintShopPro, saved it off to PNG Transparent and as Marco points out it goes in without having to select Premultiplied Alpha Channel. You may want to check how you are saving your graphic PNG files to assure they are 32 bit alpha channel transparent.

klaas-h wrote on 11/30/2018, 1:41 PM

Thanks a LOT Eagle Six!

This is a quick and easy way to do just that what I want. It's also pretty easy to do.

Eagle Six wrote on 11/30/2018, 1:49 PM

OK, glad that will work out for you. As Marco points out, when you have time for future projects, if you save your graphic PNG's with the proper alpha channel transparency attributes, it will avoid your issue in Vegas Pro.

klaas-h wrote on 11/30/2018, 2:41 PM

I have tried Marco's suggestion and on first sight it is looking better. That's great

Also I use output from 3D Blender to do animations that I lay over my video's and that gives me great 3D options. I will try some more whether I can instantly get the right properties in de PNG's right away.

I also saved the video with .mov extention from 3 Mbps format and so I have a transparent video for easy use. Also I can use the projectfile and nest it of course in new projects.

Thanks guys!

klaas-h wrote on 11/30/2018, 3:00 PM

I disabled compression in Blender for my PNG's and now I have them strait away transparent on the timeline! I did some more changes but I'm pretty sure this does the thing ;-)

Eagle Six wrote on 11/30/2018, 3:10 PM

Good deal and maybe by posting your success will help someone else in the future.....great job klaas.