Path: utzoo!attcan!uunet!pdn!bam-bam!efwjr From: efwjr@bam-bam.paradyne.com (Ellsworth Warmouth x2882) Newsgroups: comp.graphics Subject: Re: GIF images lack gamma info too: (was pixel aspect ratio in GIF images) Message-ID: <1990Jul23.154140.20291@pdn.paradyne.com> Date: 23 Jul 90 15:41:40 GMT References: <9866@pt.cs.cmu.edu> <9894@pt.cs.cmu.edu> <5031@labtam.oz> Sender: usenet@pdn.paradyne.com (0000-USENET News Administrator(0000)) Organization: AT&T Paradyne, Largo, Florida Lines: 32 In <5031@labtam.oz> graeme@labtam.oz (Graeme Gill) writes: > text deleted < > Because most GIF image viewing programs do not compensate the images >for the gamma characteristic of the monitor being used, distributed images >seem to include a variety of gamma compensation levels. I find this variation >second only to aspect ratio in its annoyance factor. >Those images with no compensation (ie. linear images, display gamma = 1.0) >are the ones that appear particularly dark when viewed on most systems. >Systems that compensate for the display gamma will display these dark >images correctly, but the majority of images will appear too light. > text deleted < > Graeme Gill > graeme@labtam.oz.au I have always wondered why my images looked different on a Macintosh and a Sun. Does anyone have any idea how to change the display gamma? Does it just involve converting the colormap of a gif that displays correctly on a Mac using some scale factor, to get the image to display properly on a Sun? What are typical compensation factors involved with a conversion? Does it matter what type of monitor you have, or is it the monitor driver card that determines the gamma compensation level. Thanks Ellsworth ---- Ellsworth Warmouth AT&T Paradyne Corp. Largo FL 813-530-2882 UUCP efwjr@pdn.paradyne.com Amateur Call KB4SH Opinions expressed are mine alone and not necessarily those of AT&T Paradyne.