NTSC artifact colors for Apple IIGS

You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

Go to file

Dave Schmenk 5dcd880b7c replace y with l in luv2rgb to make more sense		3 years ago
images	Delete racecars.pdf	6 years ago
Artifact Colors: TNG.pdf	KFest presenttion	6 years ago
IMGVIEW.PO	Add remaining files	6 years ago
README.md	Update README.md	6 years ago
SLIDESHOW.PO	Add slideshow disk image	6 years ago
imgview.asm	Add remaining files	6 years ago
makefile	Initial check-in	6 years ago
ntsc-140.py	replace y with l in luv2rgb to make more sense	3 years ago
ntsc-160.py	replace y with l in luv2rgb to make more sense	3 years ago
ntsc-640-err.py	replace y with l in luv2rgb to make more sense	3 years ago
ntsc-640.py	replace y with l in luv2rgb to make more sense	3 years ago

README.md

SHR-NTSC

NTSC artifact colors for Apple IIGS

First things first: This is far from perfect. I took many liberties in the YUV conversion to improve the possible color matches. There is also quite a bit of chroma-ringing around high contrast areas. But this should be a good start for further explorations.

My 2017 Kansasfest presentation slides are here as a PDF. You can also watch the presentation (prepare to be bored) on YouTube: https://www.youtube.com/watch?v=S8ZsefIEnvE

Or high quality on archive.org: https://archive.org/details/2017_Kfest_NTSC_Artifact_Colors_The_Next_Generation

There is a self-booting 5 1/4 disk image (SLIDESHOW.PO) slideshow of the racecar images (sans 160 pixel version, just wouldn't fit). Press RETURN to advance to next slide. The following images are from the slideshow (including the 160 pixel version).

Original:

Double Hi-Res Graphics:

Super Hi-Res Graphics mapping 140 pixels:

Super Hi-Res Graphics mapping 160 pixels:

Super Hi-Res Graphics mapping 640 pixels:

Super Hi-Res Graphics mapping 640 pixels with error diffusion: