EBU color bars HELP

[Thomas Leong]

Look at Color Bars and How To Use ’em

For PAL, just ignore the lower third and any hue adjustments.

ThomasLeong

[Wong Kwang han]

OK thanks thomas, so i would adjust as according to the instructions but ignoring any hue adjustments, and adjustments to the lower third bars?

[Wong Kwang han]

OK thanks thomas, so i would adjust as according to the NTSC instructions but ignoring any hue adjustments, and adjustments to the lower third bars?

[Thomas Leong]

Yes.

You won’t have any hue controls working in PAL mode anyway.
And for PAL, the color bar chart should not have any grey gradations in the lower third, right corner as in NTSC. It is one big black, or as in the example PAL bitmap at videouniversity’s site shows, one big red.

My own method is less sophisticated, but IMO still as effective. I eyeball my tuning, as follows –

Bearing in mind that TV originated from B&W and color came later, I first zero all color controls. Then turn down the contrast control to zero as well. Next the brightness control is tuned till I get some kind of a faint picture. Contrast is then added to achieve a good B&W with details in the shadows. Best to use a video image or still frame for this – one that has highlights and shadows – rather than the color bars. Remember the objective is to get a good B&W picture. When done, I then add color to my satisfaction, i.e. where skin tones are not too reddish, but just about right. The color bars are then used to check my settings.

With NTSC and its different hues, the color adjustment is more critical. With PAL, we just don’t have those problems.

Of course, if you have a vectorscope and waveform hooked up, you could use those to check as well: vectorscope for color, waveform for luminance (blacks & whites).

ThomasLeong

[Wong Kwang han]

thnaks man

appreciate it