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Your understanding of conversions between metric and imperial
measurements is decidedly limited.
one inch = 25.4 mm
TRUE
Two inches = 50.8 mm TRUE
2.5 inches = 63.5 mm (Not 61.5 as you
give). TRUE
BUT your next line should be the
first reversed, 1 cm = 1/2.54 " = 0.039 inch
Also, metric prefixes operate in powers of 10.
1 km = 1000 m (k - kilo or
1000)
1 m = 1000 mm (m - milli or
1/1000)
1 m = 100 cm (c
-centi or 1/100)
10 mm = 1 cm
100 cm = 1 m.
and the other figures you used, 1 m = 39.37
inches
As a Physics lecturer for over 30 years, and having worked
with both metric and imperial measurements since my undergraduate days, these
conversions are automatic to me.
Furthermore, if you have 2100 pixels per inch making up a
picture, to create a line you need 1 dark pixel (off) and 1 light pixel (on) to
create a line pair.
Jim Thyer MSc, PhD.
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