Whoops...minor error in the calcs. Each pixel is represented by 1-bit, not
1-byte as in my calcs. Corrected version below, but I'm sure you got the
general idea. =)
> ----------
>
> From doing many screen prints for documentation, let me offer one piece of
> advice...
>
> Reduce the screen resolution and bit-depth (number of colors) the the
> absolute minimum required for your screen shot.
>
> I once was given a document that was only 4 pages long, but took up 47MB of
> drive space. It consisted of two paragraphs of text and a few screen shots.
> Not only did it take up a LOT of space, but most people couldn't open it...it
> was just too darn big!
>
> The main culprit in large filesize screen shots (or any photograph in
> general) is the color depth. Every one byte (8-bit) increase in color depth
> will increase the filesize of an uncompressed picture by 2. HxV resolution
> also plays a major role and it's closely tied to the bit-depth. Here are
> some uncompressed calcs...
>
> 640x480x8-bit (256 colors) = 307K
> 640x480-16-bit (64K colors) = 614K
> 640x480x24-bit (16M colors) = 922K
> 800x600x8-bit (256 colors) = 480K
1024x768x24-bit (16M colors) = 2.4M
> If you send a screen print via e-mail, it's best to use a common "compressed"
> format, such as .JPG. However, don't go overboard on the compression as he
> resulting image will become pixelated (equiv to "grainy"). I generally use a
> 75% quality setting for low res pics, and 50 to 60% for high res pics (or
> even 30%). Proper use of picture compression can yield excellent results. I
> have made 50K .JPG's that look much better many 200K+ files you'll find on
> the 'net . For printing, a TIFF is preferred, but filesizes are large.
>
> Alright, I've digressed enough. 73 and happy screen printing!
>
>
> - Aaron Hsu, KD6DAE
> [athsu]@unistudios.com
> [kd6dae]@arrl.net
> No-QRO Int'l #1,000,006
> . -..- - .-. .- " .... . .- ...- -.-- "
>
>
> p.s. The best utility I use to change display resolutions on the fly is the
> "ResMan" util. It's available as a Win95A "PowerToy" and is standard wth
> Win95 OSR2 and Win98. It runs in the System Tray and allows changing
> resolutions and bit-depth on the fly. Some video drivers also have a similar
> function.
>
>
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