Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!wuarchive!uunet!mcsun!ukc!stl!crosfield!jc From: jc@crosfield.co.uk (jerry cullingford) Newsgroups: comp.sys.amiga.graphics Subject: Re: need 24bit->8bit quantizer with "locked" colormap/pallete Message-ID: <10224@suns7.crosfield.co.uk> Date: 7 Jun 91 15:06:22 GMT References: <62130@masscomp.westford.ccur.com> Reply-To: jc@crosfield.co.uk (jerry cullingford) Followup-To: comp.sys.amiga.graphics Organization: Crosfield Electronics, Hemel Hempstead, United Kingdom. Lines: 66 In article <62130@masscomp.westford.ccur.com> mark@masscomp.westford.ccur.com (Mark Thompson) writes: > A friend of mine >who owns ADPro claims that it can do this, but the GIFs I have seen ADPro >create look terrible compared to the ones I have converted using the PD X11 >program xv. Is it possible he did his conversions improperly. He said he >selected a pallete of 256 colors. >Thanks for any pointers or help. ADPro should be able to do it - I'm fairly sure you can lock the palette (I'd have to check, and my amiga's at home). Anyway, ADPro will handle a 256 colour palette. There are several options that could affect the appearance of a gif generated by it: Palette mode - select "enhanced"; "normal" restricts you (I think) amiga 4096 colour resolution, "enhanced" allows more precise colour resolution (for VGA etc) and works with amiga modes too, but takes longer for no (amiga) benefit? (You may need to alter the WB info stuff to enable enhanced mode) using "normal" means that you aren't picking your 256 colours from the full range available. Dither mode - Adpro has around seven or eight dither options (including "none"). Balancing options - brightness, gamma, contrast, etc Image operations - dynamic range adjust, & lots more and last but not least - What was the source image? if you make a gif from a normal amiga image, you won't get any more colours, since the info isn't there to start with. I've been using ADPro with a sharp JX-100 scanner, and the amiga mode images that result are the best I've ever seen. I've only just got hold of a (PC SVGA) GIF viewer that works at > 320x200x256, so I haven't tried high resolution GIFs yet; 320x200x256 looked OK but not as nice (not surprisingly) as 320x512 HAM on the amiga, but that's probably mostly down to the resolution difference. And you can drive ADPro from AREXX. If you want to do image conversions on an amiga, you NEED ADPro.. when I first saw it, I thought "so what?". Now that I need to convert things (in my case, 24 (well 18 actually) bit images) I'd hate to be without it. Go out and buy a copy now! >%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~% >% ` ' Mark Thompson CONCURRENT COMPUTER % >% --==* RADIANT *==-- mark@westford.ccur.com Principal Graphics % >% ' Image ` ...!uunet!masscomp!mark Hardware Architect % >% Productions (508)392-2480 (603)424-1829 & General Nuisance % >% % > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- +-----------------------------------------------------------------+ | | Jerry Cullingford #include +44 442 230000 | ,-|-- | jc@crosfield.co.uk (was jc@cel.co.uk) or jc@cel.uucp x3203 | \_|__ +-----------------------------------------------------------------+ \___/ -- +-----------------------------------------------------------------+ | | Jerry Cullingford #include +44 442 230000 | ,-|-- | jc@crosfield.co.uk (was jc@cel.co.uk) or jc@cel.uucp x3203 | \_|__ +-----------------------------------------------------------------+ \___/