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Article #1145

Re: QuickTime and Fast Dithering

#1145
From: Lawrence D'Oliveiro, Waikato Uni...
Date: Tue, 17 Nov 1992 01:18
37 lines
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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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Message-ID: <1992Nov17.141853.12229@waikato.ac.nz>
Path: arc1-ca.pugleaf.net!sparky!uunet!comp.vuw.ac.nz!waikato.ac.nz!ldo
References: <40577@sdcc12.ucsd.edu> <92315.105843RXF10@psuvm.psu.edu>

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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