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- Path: sparky!uunet!gatech!purdue!mentor.cc.purdue.edu!nova.cc.purdue.edu
- From: ab@nova.cc.purdue.edu (Allen B)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: Gray scale output
- Message-ID: <54875@mentor.cc.purdue.edu>
- Date: 23 Jul 92 15:53:34 GMT
- References: <1992Jul16.164546.2876@clipper.ingr.com>
- Sender: news@mentor.cc.purdue.edu
- Lines: 36
-
- In article <1992Jul16.164546.2876@clipper.ingr.com> kontos@clipper.ingr.com
- (Thorne Kontos) writes:
- > 1) Can the Amiga be made to display >256 gray scales at the same time
- > (range Black to White). If a stock Amiga can not be made to do this,
- > can one of the 3rd-party graphics boards accomplish this?
-
- Not really. We've only got 16 gray shades, but the HIRES
- LACE pixels are small enough you can get a good dither
- going. If you need real-time response, you can use an
- ordered dither and get pretty good results. If you don't,
- error diffusion might give you better results. It
- depends on the material and what effect you're looking
- for.
-
- DCTV will give you 160 gray shades, which is plenty on a
- composite display (which is what it is). If you only want
- to work in black and white, it's not much slower than
- plotting to an ordinary screen for real-time use, and
- basically no slower for non-real time applications.
- (Color is slower.)
-
- The toaster and other 24 bit boards (Firecracker,
- OpalVision, Resolver) will give you 256 gray shades.
- Again, you can dither to simulate more. How accesible
- these are from your own programs varies. I haven't tried
- them.
-
- I don't know of any displays for the Amiga that have more
- than 256 gray shades.
-
- > 2) Can someone out there send me some simple c code for reading iff files?
-
- A recent Fish disk has the latest Commodore release.
- Great stuff if your program only has to work on an Amiga.
-
- ab
-