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[OM] Olympus Calendar in Electronic Format? Think Again!

Subject: [OM] Olympus Calendar in Electronic Format? Think Again!
From: Garth Wood <garth@xxxxxxxxxxxxxxx>
Date: Tue, 20 Jan 1998 08:55:23 -0700
Cc: garth@xxxxxxxxxxxxxxx
Well, looking over the posts which brim over with enthusiasm for the idea of
an electronically-distributed (assumedly, via the 'Net) Olympus Calendar, I
got to thinking:  just how big would this sucker be, in file size(s)?
Here's some quick back-of-the-envelope calculations:

If the assembled personages of this august list wanted to have 2450 dpi
output (Lino, gives approx. 133 lpi [good magazine quality]), the following
would hold.

   Image Size: 8" x 10" (for example)
   Bits per square inch: 2450 x 2450 = 6,002,500
   Square inches in image: 80
   Size of image file (ignoring overhead, monochrome):
      80 x 6,002,500 = 480,200,000 bits
                     =  60,025,000 bytes
                     =  57.24 Mbytes
   Size of image file (CMYK): 4 x 57.24 Mbytes = 228.98 Mbytes

   Download speed using a 28.8 modem dialup with 97 0.000000e+00fficiency 
(27,936 bps):
      (480,200,000 x 4) / 27,936 = 68,757 seconds
                                 =     19.1 hours (approx.)

That's for *one* image, folks.  If you drop the dpi (you no longer have
display-quality on paper, although a good dye-sub printer could fake a lot
because it does continuous-tone gradations), you get the following results:

   At 600 dpi output, file size is 13.73 Mbytes for CMYK separation, 68.73
mins. d/l time at 28.8 Kbps w/97 0.000000e+00fficiency
   At 300 dpi, file size is 3.43 Mbytes for CMYK, 17.18 mins d/l time as above

Now assume you have *twelve* of these images (singles or composites of
several images, doesn't matter), plus another few megs for the line art on a
calendar.

Anybody on this list really that interested in getting digital delivery of a
calendar?  It could be "Web-ified" (a series of Web pages, one or more for
each month), and people could simply surf to the appropriate month, but
quality would suffer (you can do a lot with "lossy" compression, but there
are limits).

Nevertheless, I think this is a good idea, *provided* everyone here
understands the quality compromises inherent in digitizing their photos and
delivering them via relatively thin pipes.  Alternatively, delivery could be
on CD (not for the 2450 dpi option, but for the others), but I'm not sure
I'd want to mount the authoring effort (not to mention the cost) involved in
burning X number of CDs and sending them all over the planet via Canada Post.

Thoughts?

                      


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