Re: Double hires mode color artifacts

[Jerry <SNIPawanderin@yahoSNIPo.ca>]

Michael J. Mahon wrote:
>> I'm also working (slowly) on writing a table-generator for use by the
>> N-bit
>> shift-register algorithm this thread discusses.  I'm reading up on how
>> NTSC
>> TV decoders really work.  I've looked at the analogtv.c source (from the
>> Jamie Zawinski's xscreensaver), but I'd like to start with some code
>> that's
>> easy-to-understand.  His code is rather convoluted, IMO, by all the extra
>> signal degradations he put in.  Since I don't fully understand NTSC
>> decoding, I'd prefer to learn and build my algorithm up step by step.
> 
> Sounds good.  A faithful emulation does not need gratuitous errors,
> like a jumping raster, a tearing raster, nonlinearity, or noise.
> 
> Although it *would* be nice to have the contrast, brightness, hue, and
> saturation controls.  ;-)  (Adjusting them would perform a transform on
> a standard table to produce the actual table to be used.)

Yes, I plan to put those in, and was thinking that I could just update the
lookup table and the video emulation would simply repaint with the
alterations.

>> When it's done, it will be some fruit of the ideas of various people:
>> Linards T, Michael M, Vlad I, Andy M, and probably others.
> 
> And the result of *your* curiosity and persistence!

thanks.  I do feel a compulsion to understand NTSC decoding.

--
--  Jerry