On Sun, Dec 03, 2006 at 08:52:31PM +0100, Alfio Puglisi wrote:
On 12/2/06, Lars Aronsson <lars(a)aronsson.se>
wrote:
For example, the image
http://runeberg.org/img/nfad/0670.4.png is
240 kbytes in 150 dpi 16-level grayscale PNG but only 200 kbytes
in 600 dpi bitonal TIFF G4. The difference between 150 dpi
grayscale and 600 dpi bitonal becomes very clear when you try to
print the page on a 600 or 1200 dpi laser printer.
Well, you should compare apples to apples. The image you specified
becames only 58 kbytes wen saved as 1-bit (bitonal) PNG. And bitmapped
formats like PNG and TIFF have no concept of "dpi"- that's an external
manipulation made by the printing program. You need to compare images
with the same pixel sizes.
Well, an inference could be made that when one describes two images
with differing DPI renderings that the *final size in inches* is
expected to be the same, but you're right: that's expecting too much of
the speakers... :-)
Cheers,
-- jra
--
Jay R. Ashworth jra(a)baylink.com
Designer Baylink RFC 2100
Ashworth & Associates The Things I Think '87 e24
St Petersburg FL USA
http://baylink.pitas.com +1 727 647 1274
(I've been informed that the 'divorce' quote makes me look
misogynistic, even though Jennifer Crusie is (pretty obviously)
a female romance novelist. So I've removed it. :-)