In article <1992Jul15.221632.14917@crash.cts.com>, billyh@pnet01.cts.com (Bill Huey) writes:
|> Me and a friend of mine were wondering how DCTV, the graphics display adaptor,
|> works ?
|>
|> We have seen it effectively display 8 bits per pixel using the the Amiga's
|> high-res 4 bit plane mode in black and white. Um, say this is impossible isn't
|> it ???
|>
|>
|> Well, people in short this is magic and we are really annoyed about this piece
|> of hareware trickery.......we woul like an explaination......
DCTV intercepts the output from the amiga's RGB port and translates it into a
composite NTSC image. The tricky part about how it works is how a 3 or 4-bit
image is translated into the composite image. I read somewhere that the data
in the 3/4-bit image has information about wave-forms encoded in it. Try
drawing a solid sphere of any color on a black background, and look at it's edges. You don't get well defined edges, instead you get a fade from black to the
color of the sphere. You also can't really see individual pixels. I don't
completely understand how this works, but I think the 3/4-bit image contains info
about how the current intensities should be modified on the next pixel to the right of the current position. Something like that. I have'nt tried to figure
