What color is it?
...and how white was it actually in the original? eg. Where on the waveform?
I'm keying a guy talking from a greenscreen to white background. So, two video channels with a white matte (255/255/255)
In the CS5 preview screen, if I do a screen capture, it's white. But after I encode to F4V the white goes to (235/235/235)
I've checked all sorts of things, opacity levels, used max. render & depth quality in AME, but nothing helps.
Here's back to back examples: http://i.imgur.com/yr20n.jpg
235 actually is "white" in the NTSC and ATSC video standards.
1 person found this helpful
In what application are you checking the output? What do you see when you bring the video back into Premire Pro and check the color values there?
235 is the limit for broadcast-safe color for video that will go over an analog system. It appears that something along the way is clamping your analog-broadcast-illegal 255 values to 235.
Here's a page with some explanation of broadcast-safe colors; though it's written for After Effects, the concepts are the same.
The white background is 'dimmed' by 10% in the encoding process. There must be a workaround where thats not lost?
Do video standards come into play when exporting to F4V? The greenscreen was originally shot on HDV 1080i PAL, but I get the feeling that if I were to create a F4V encode from CS5 using just that white matte, it would still go slightly grey....
My first application to check white was my eye. I could see it was a duller white. Not what I need.
Secondly, I took a screen grab from CS5 preview window and then one from the the F4V (via VLC) - imported them into Photoshop, and eyedropped the white to check value.
When I then import the F4V back into CS5, it's white again?? So, good point!
This project is not for broadcast, TV or DVD. Just web.
Why doesn't the white stay as white?
Dont know if this helps you but...
I had a web project that required a character to appear on a white web page.
I shot green screen key BG
I decided that I did not know what "white" was in the web page because I was not the author of the web page and I did not want a frame around the character. ie I wanted it seamless.
I simply supplied the web author with Flash with alpha.
It might be VLC that's doing the clamping to 235. Try playing the same F4V file in Adobe Media Player and see what you get.
Your method, basically creating a "sprite" with that Alpha should work. Then, the FLV can be placed over whatever background is needed.
Good luck to the OP,
Thanks Todd, that was the problem... tried it with Adobe Media Player, and embedded on a webpage and the white stayed white.