Secondary color corrector bug

Tech Diver wrote on 8/27/2011, 1:37 PM

I don't know if anyone has noticed this but if you apply the secondary color corrector to an image with an alpha channel and have the "alpha" slider all the way at 1.000, the alpha background gets tinted and is clearly visible. If you set the slider to 0.999 all is well. Be sure to set the correction value at some high level and have a track below it to make the bug more noticable.

I checked both the knowledge base and the forum postings but did not see any reference to this.

Version: Vegas Pro 10.0d (both 32 and 64 bit)
Widows 7 and Vista (both 64 bit)

Peter Honig

Comments

Kimberly wrote on 8/28/2011, 10:42 AM

Hello Tech:

I'm trying to reproduce your bug, but I'm not sure if I understand exactly what you are saying.

I used footage with tall pine trees aganist a blue sky. I wanted to turn the sky pink, for example, and leave the trees alone. Instead I easily turned the trees pink and the sky remained unchanged. That may have been an error on my part as I was fiddling around quite a bit. But it was very difficult to get the sky to go pink without affecting the dark green pine trees. For me it made no difference if the Alpha slider was at 1.0 or .999.

Can you post a screenshot of your secondary CC FX window so I can see your settinigs? Or just list them if you not able to post a screen shot. I am especially curious because secondary CC doesn't always behave the way I wish it would -- not sure if it's the way I am using it, or the software itself.

Regards,

Kimberly

Grazie wrote on 8/28/2011, 1:01 PM

Maybe installing VP10e will kick it into touch?

Grazie

Grazie wrote on 8/28/2011, 1:32 PM

What do you mean, set the Correction value high? Don't understand

Anyways, I have an uncompressed with Alpha channel. No pink.

Grazie

Tech Diver wrote on 8/28/2011, 2:21 PM

Sorry about the lack of clarity in my description. Anyway...
1. Create two video tracks. On the top track place a STILL image of something with an alpha channel (like a PNG file of an object with the background stipped away).

2. On the track below it, place a video clip or different still image that has NO alpha.

3. Next, apply Secondary Color Correction to the top image (the one with the alpha), and pull the "dot" in the color wheel from the center to the edge of the circle (this is what I meant by high correction value)

4. Make sure the alpha slider in the Secondary Color Corrector is at the extreme right (a value of 1.000).

5. You should now see that the alpha background in the top image is no longer transparent. Set the slider to 0.999 and the problem goes away.

Hope this helps,
Peter

rs170a wrote on 8/28/2011, 2:33 PM

Confirmed on Pro 10.0e
XP Pro SP3

Mike

Grazie wrote on 8/28/2011, 3:48 PM

Yup. Repro-ed. VP10e 32bit on 64bit OS.

Grazie

Robert Johnston wrote on 8/28/2011, 4:30 PM

At first I thought you were discovering some unknown, undocumented feature of the secondary color correction filter. When Alpha=1.000 it means there is no transparency. So how can transparency have no transparency? By setting Alpha=1.000. But then I tried some of the other sliders by moving them slightly off the maximum setting and saw that the tint went away as well even when Alpha was 1.000. Then my mind became boggled.