sellswor@jarthur.Claremont.EDU (Scott Ellsworth) (01/15/91)
Hi all.
I am using a personal laser writer IInt for some homebrew postscript
pictures involving lots of filled rectangles. Someone has told me that
there is a modification to the setgrray routines that will improve them.
(By eyeball, it looked like they were basing the grey fills at 75 or
a hundred dpi at most -- the pixels they filled in to get thier fills
were somewhat larger than 1/300th of an inch)
Does anyone know of such a set of routines? It looks like we are
getting 32-64 distinct grey levels; I thought a 300 dpi printer could do
better.
Please reply directly if possible; I tend to get way behind in this group.
Scott Ellsworth
sellswor@jarthur.claremont.edu
SELLSWORTH@HMCVAX
--
Scott Ellsworth
SELLSWOR@HMCVAX
sellswor@jarthur.claremont.edu
B.S. in Physics and Computers, May 1989. Reasonable rates. Inquire withinwoody@chinacat.Unicom.COM (Woody Baker @ Eagle Signal) (01/15/91)
In article <10315@jarthur.Claremont.EDU>, sellswor@jarthur.Claremont.EDU (Scott Ellsworth) writes: > > Does anyone know of such a set of routines? It looks like we are > getting 32-64 distinct grey levels; I thought a 300 dpi printer could do > better. From Don Lancasters Laserwriter corner #18. screen desity screen angle 50 0 ->37 grays 50 5-10 ->39 grays 50 15-20 ->42 gray 50 25-30 ->35 grays etc. (the list is to large to type in here..) normal default is 53 45 which provides 33 grays, and really is baaaad. Here is Don's best gray 106 45 {dup mul exch dup mul add 1.0 exch sub} setscreen This gives you a 9 level gray. use 85 35 for reduced reproduction, 75 15 for halftone photos and 135 25 for india ink wash effects. (these are relly fine) 135 25 gives you only 6 grays but there are super. There is a secret gray map program that I'll try to post. It is available on the Genie Roundtable. Cheers Woody