Faint greenish hue on MPEG-2 render

vitalforce2 wrote on 12/27/2005, 2:07 PM
I wasn't sure how to search this topic so taking the liberty of posing a new one.

In rendering from the Vegas (5 & 6) timeline to avi and MPEG-2 files, and also when playing back a rendered MPEG-2 file on the computer monitor or through firewire to a TV, the picture has the color balance I'm trying to achieve (of course the TV is always much brighter). But when I burn a DVD with DVDA3 and play it back in an attached external DVD player routed to the same TV, the picture has a noticeable greenish tint compared to the original, and even a few areas of greenish hue on strong lines.

This concerns me because I'm burning DVDs of our film for festival review and I'm not sure what they'll be approximately seeing on the other end. I'm hoping it's just my player, a JVC VHS player which also plays back (but does not record) DVD. I can reduce the green 'tint' and redo the DVD if there is truly a green-shift problem

I am assuming that what I'm seeing is a loss of red, green and blue pixels in the compression process, but since green carries luminance, there is more green "left behind," i.e. noticeable, than red or blue after the MPEG-2 compression is done.

Any thoughts on what to do?

Comments

Liam_Vegas wrote on 12/27/2005, 2:37 PM
That sounds pretty unusual... as a test... can you play your DVD using a different DVD player?
vitalforce2 wrote on 12/27/2005, 2:42 PM
Aha--tried that on the DVD player attached to the TV in the living room and the "hue" rather than greenish, is reddish (minimally but noticeable). I'm thinking it's the JVC player or a need for shielded cable, some such thing.
Steve Mann wrote on 12/27/2005, 9:27 PM
Computer monitor, TV in the studio and the TV in the living room. Anyone else see the problem here? I would expect all three to look differently. The monitor has a different phosphor than ordinary TV sets, so it will look different, and if it's an LCD, it has a completely different gamut and won't look the same on a TV. No way, nohow. I wouldn't expect the TV sets to be similar unless they are both properly calibrated. The only way to be sure what your product looks like is on a calibrated pro monitor.

Steve
vitalforce wrote on 12/31/2005, 11:35 AM
I appreciate that advice and am well aware a calibrated studio monitor is the only way to really know what color is being output. That way, the color gamut variations from one viewer's TV to another won't seem too far off scale for that viewer's experience.

For purposes of festival review discs I was content to see if the colors look OK to the naked eye on several different TVs, not owning a studio monitor, and was only wondering why a faint green tint had crept into a calibrated WEGA Sony monitor I use for basic color correction (not a studio monitor) that is fairly new. I was aware my living room TV has a red bias, for instance, as many commercial TVs do, and had adjusted my "eyes" for that.

Guess what--loose connection. Duh.

Happened to brush my hand against the 3 wires connecting the component output of my JVC DVD player and the monitor and bam--the color returned & is similar enough to the other TVs that I stopped fretting about color. Once again, the old advice of "did you check your connections?" never loses its importance, no matter how advanced the equipment gets.

I did learn from the experience that when I take on the next project, I'm using a studio quality monitor, period.
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