Re: Digital photo frames comparison

[Steve Cuthbertson <steve@xxxxxxxxxxxxxxxxx>]

On Sun, 12 Nov 2006 14:52:58 +0000, I wrote:

Lots of deleted arithmetic...

==============================================

I notice on wikipedia
(http://en.wikipedia.org/wiki/List_of_common_resolutions)
that there a lots
of other ratios too.
You should be able to work it out using Pythagoras' theorem, knowing the
pixels for the two sides you can calculate the pixels for the diagonal
(h^2=a^2+b^2),
divide that by the size in inches (or cm) of the diagonal, gives you a
pixels-per-unit measure,
then divide the width in pixels by that measure for width in units,
the height in pixels by that measure for the height in units,
multiply height by width for number of square units on screen,
divide (pixels wide times pixels high) by number of square units for
pixels/sq.unit.
Remember, use at most three decimal places, and pixels/sq.unit is an
integer
(approximate, to be sure, but near enough for our purposes).
Phew.
Hope this helps rather than confuses.

Steve.



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