I was trying to calibrate my monitor (750line JVC studio monitor) with the color bars output through the s-video to the monitor and there is bad bleed. The blue bleeds over onto the red, the magenta bleeds onto the green and the cyan bleeds over onto the yellow. The monitor is definetely calibrated correctly, in fact you see this bleed pretty much until you remove all chroma from the image. For shits and giggles I looked at the bars on the LCD on the DVX and the bleed is obvious there as well, scaled down but there. So is this the signal that DVX produces? Or do I have a cam issue? Or am I just missing something? No settings (short of setup) should effect the color bar signal right? I noticed this while looking at some footage shot a while back. The actor was wearing a green shirt and behind him was reddish wood paneling. I didn't notice it then but there was obvious bleed of the green into the red. Anybody got any suggestions? unfortunately I can't post a grab cause my Vegas system hasn't arrived yet.
Color bar bleed problem
- Thread starter ian
- Start date
Due to the reduced chroma sampling raster (4:1:1/4:2:0) in DV and extra chroma bandwidth limitations in color TV systems (NTSC/PAL) color bleeding is unavoidable. In best case the bleeding is symmetrical (left/right) meaning that the Y/C delay in yr system is OK. S-video interconnection does not result in higher chroma bandwidths as compared to composite signals. Color transient improvers (CTI) are often used in higher end consumer TV's to reduce color bleeding
I'm going have to try composite cables and see if it makes a difference. The bleeding is symetrical so I guess that's "good". It just worried me that the same thing is visible in the LCD monitor on the camera so it is just the DV sampling raster. I've found while shooting it's only noticable if you put the wrong colors next to each other (i.e. red next green). I hadn't heard anyone mention it before and it seemed rather noticable on the color bars. Oh well, I'll work around it, I guess.