Still rendering problem

Joris R wrote on 2/14/2015, 6:12 AM
Hello,
I am rendering a video with a still. The still is the same resolution as the video (1280x720) and it is set not to scale. When I show the preview full-screen the result is perfect. But when the movie is rendered to 25p, only half the resolution remains. All deinterlacing settings, scaling and whatever I can find that might be related is disabled. I also tried a test project with just a still, same result. Is this a known bug ?
Regards,
Joris

Comments

PeterDuke wrote on 2/14/2015, 6:31 AM
Which version off Vegas?
Arthur.S wrote on 2/14/2015, 6:42 AM
Can you explain "not to scale"? If you've resized it, have you used pan/crop?
Joris R wrote on 2/16/2015, 2:35 AM
Movie studio platinum 13, build 943. I assume this code is the same in Vegas Pro and Platinum, since it's very basic functionality.

With "set not to scale" I mean that I don't scale the image. It should be transferred 1-to-1 to the output. Which it is apparently not. But it is perfect in the preview at full size.

I would understand this if I had an interlaced source, I generate interlaced output or those kind of things. But none of that is the case and just to make sure I've explicitely disabled deinterlacing in the project, and disabled resampling and disabled "reduce interlace flicker" in the timeline event. It still reduces resolution in the output.

See this video demonstrating the effect
The red lines were 1 pixel wide in the original picture. The 60 degree lines also become blocky because of this resolution reduction.

Notice the text I placed over it are full resolution. Some parts of the image do appear to be in full resolution, but the red lines are not.

Does anyone know what is going on here ?

EDIT: It appears youtube softens the picture a bit, but still it is quite visible.
John_Cline wrote on 2/16/2015, 2:57 AM
Pretty simple, you are seeing the effects of 4:2:0 color subsampling. Red diagonal lines are particularly noticeable, although it happens on all high-contrast, solid color diagonals. I can also see a bit of it in the solid colors of the logo. To what format are you rendering for upload to YouTube?

http://en.wikipedia.org/wiki/Chroma_subsampling
Joris R wrote on 2/16/2015, 10:48 AM
You are right. I first thought that couldn't be it, since it's mainly a difference in luminance. But when you calculate it, the luminance values around the lines are quite close, and the chrominance is different (must be because the background is darker but greyer).
Format is AVCHD. I thought it was 4:2:2 actually, but it appears it isn't. Strange for an archiving format. Unfortunately I cannot select 4:2:2 anywhere in Movie Studio Platinum. Maybe that's one of the reasons I should have bought Pro...
Thanks !