I'm puzzled by the fact that Tony bothered to quote me, and then cut off my final paragraph noting the lossy compression problem w/ jpegs. At any rate, I certainly agree with he and Derek--I hadn't considered the fact that jpegs have to be decompressed on the fly--not the best approach. take care, Steve +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Steve G. Hilliard (706) 542-9474 University of Georgia Cell Analysis Facility flowman@uga.edu URL: http://floweb.cb.uga.edu/Floweb/ +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ On Thu, 7 Oct 1999, Tony Schountz wrote: > "Steve G. Hilliard" wrote: > > > While I'm no expert on imaging or QT, I would suggest converting each to a > > jpeg, since this format presents photos so well, and produces quite > > compact files. If you have any control over jpeg quality you might want > > to do a trial run at different settings, because jpegs can often be > > compressed at 50% quality and still look good enough for the web. I > > would think the same would be true for movies. (I'm surprised it lets you > > produce QT's from tiffs, because they're huge! Streaming tiffs would take > > a LOT of computing power. I'd go for a Linux beowulf cluster ;-) > > One word of caution for this approach. JPEG is a compression algorithm that > loses pixel information each time a file is saved. Standard TIFF does not use > compression and thus no pixel information is lost. Consequently, TIFF files are > very large compared to JPEG. In the final analysis, TIFF provides a better, but > larger image. If you want to string together images as a QuickTime movie, > compression of each image is not necessary (and may result in image > deterioration) as QuickTime files are compressed when made. On the Mac platform, > the file formats of choice (IMO) for storing still images for incorporation into > a QuickTime movie are PICT and Photoshop native. No pixel information is lost > and when they are incorporated into a QuickTime movie by QuickTime editing > software, the final movie is compressed to minimize file size. > > Just my $0.02 worth. > > -- > Tony Schountz, Ph.D. > Department of Biological Sciences > Mesa State College > mailto:tschount@mesastate.edu > >
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