Talk:Myths
- An offhand comment. Wouldn't be better to change "NTSC NES picture" term into "NTSC NES PPU output"? Perhaps the second one sounds more technical than the original though. A NES picture could be anything like the straight thing: a picture of a NES unit, for example. When you say "PPU output", we have something more concrete. Yup, it's a picture, or "frame", but not "a picture of the NES", anyways... :) --Zepper 23:11, 2 February 2011 (UTC)
All three color emphasis bits with color 0D
According to my interpretation of various posts in this forum thread: sony trinitron + color emphasis bits = scrambled image?, if you use all three color emphasis bits and use color 0D, that color's signal may dip too low and confuse some TVs:
- In the first post, GradualGames says he used all three color emphasis bits to dim the screen and got "an extremely ugly bunch of scanline artifacts" on his Sony Trinitron. In a later post, Sdwave says he also saw "some bending" using one of the palette demos on a Trinitron and suggested using 3F [= 1D*] for black instead of 0D. Later, GradualGames confirms using 0E [= 1D*] instead of 0D got rid of the artifacts.
*According NTSC video, the xE and xF colors send the same signal level as 1D.
Lidnariq points out that mathematically, even color 1D with all three color emphasis bits dips lower than the normal black:
- If all preemphasis bits are set, then color 1D ("black") becomes blacker-than-black and 01-0C no longer decode to a valid RGB color from the received YIQ values (Their brightness is approximately equal to unattenuated color 1D). So if it looks like scanlines restarting all over the place, maybe that's why?
But based on Sdwave's and GradualGames's comments, 1D with all three color emphasis bits was fine on their Trinitrons.
