[Coco] Artifacting (again)

[Mark McDougall]

On 2/09/2010 9:54 PM, Robert Gault wrote:

> It might help you to know that you do not need to keep in mind which pixels
> are odd or even. Basic will do that for you with a little trick.

Thanks everyone for the info.

It would appear that the artifacting is a little more subtle than simply 
choosing 1 of 4 colours based on pixel pairs (which effectively halves your 
horizontal resolution, which would be no different than the CG6 mode).

If you study the screenshot from dmkeil's emulator page...
<http://www.discover-net.net/~dmkeil/coco/images/c&b-1.gif>
you'll notice, for example, that the balloons contain single black pixels 
which do not produce artifacting. Similarly, there's no artifacting 
surrounding the clown's heads holding the trampoline. Also notice the 
red/blue "score"/"high" text is only 1 pixel wide.

So there's something more to the algorithm...

Anyway, here's a photo of my attempt at crude artifacting using only pixel 
pairs... you can notice the difference in the above-mentioned areas.
<http://pacedev.net/forums/attachment.php?attachmentid=20&d=1283463691>

Regards,

-- 
|              Mark McDougall                | "Electrical Engineers do it
|  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"