Article View: comp.multimedia
Article #1145Re: QuickTime and Fast Dithering
From: Lawrence D'Oliveiro, Waikato Uni...
Date: Tue, 17 Nov 1992 01:18
Date: Tue, 17 Nov 1992 01:18
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In article <92315.105843RXF10@psuvm.psu.edu>, <RXF10@psuvm.psu.edu> writes: > > Scott, > Your idea of placing JPEGed images into Director as QTime > movies is an interesting idea (I've never tried it), but > there's an easier way. Use the "paste as PICT" command in > the Cast menu. If you have a JPEG image in the clipboard > choosing "paste as pict" will retain any QuickTime > compression associated with that picture. It will also keep > the small file size when the MacroMind (excuse me, "MacroMedia") > file is saved. I must admit there's one idea I never thought of. By the way, the company may now be called "Macromedia", but I gather the product is still called "MacroMind Director". The name identification with the product is too strong, I guess. :-) > On the other hand, if you really wanted to do it your way, > then why not dither the image in a paint program (Photoshop) > before you make you movie file of JPEG images. This isn't going to be as useful as you might think. Remember the QuickTime JPEG compressor only supports two pixel depths: 8-bit greyscale and 24-bit (actually 32-bit) colour. If you dither the image down to 8 bit colour and then try compressing it with JPEG, it will just be converted back to 24 bits again, and you'll have lost image quality without gaining anything in display speed, or probably even compression size. And if you use some other compressor, you won't get as good compression as with JPEG. The obvious one to try, though, is the "Graphics" compressor, which is supposed to deal well with 8-bit dithered images. Lawrence D'Oliveiro fone: +64-7-856-2889 Computer Services Dept fax: +64-7-838-4066 University of Waikato electric mail: ldo@waikato.ac.nz Hamilton, New Zealand 37^ 47' 26" S, 175^ 19' 7" E, GMT+13:00
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Path: arc1-ca.pugleaf.net!sparky!uunet!comp.vuw.ac.nz!waikato.ac.nz!ldo From: ldo@waikato.ac.nz (Lawrence D'Oliveiro, Waikato University) Newsgroups: comp.multimedia Subject: Re: QuickTime and Fast Dithering Message-ID: <1992Nov17.141853.12229@waikato.ac.nz> Date: 17 Nov 92 14:18:53 +1300 References: <40577@sdcc12.ucsd.edu> <92315.105843RXF10@psuvm.psu.edu> Organization: University of Waikato, Hamilton, New Zealand Lines: 37