Re: Fix for 687403 Poor halftoning for 16 color (4bit) devices
"Igor V. Melichev" <[email protected]>
| Newsgroups | gmane.comp.printing.ghostscript.patches |
|---|---|
| Message-ID | <[email protected]> |
Dan, > From: "Igor V. Melichev" <[email protected]> > To: <[email protected]>; "Gs-Code-Review" <[email protected]> > Sent: Tuesday, April 06, 2004 11:23 AM > Subject: Re: [gs-code-review] Fix for 687403 Poor halftoning for 16 color (4bit) devices xefitra > 1. k = max (min(r,g), min(g,b), min(r,b)); > 2. ucr = (000 ? 111/3 : 111 ? 11*2/3 : [max(0,r-k),max(0,g-k),max(0,b-k)]) This formula appears wrong, but there exists a better one. Actually a better space for this is RGBL, where L is a lightness (l == 1-k). Igor.