Thorsten, Leonard,
Regarless the exact amouts, we need for screen display slowres images
tand for printing highres. So we store in the OO-doc the highres with a
lowres copy aside or there is a rendering technique who produce the
lowres a the spot. During editing and screen display OO use the
lowres when printed OO use the highres.
Beside we need a more intuitive an informative dialog who explains a
the user at what size the image can been show on screen or at printing
Greetz
Fernand
Jan 14, 2009 at 11:58:47PM +0200, Leonard Mada wrote:
I can't believe that a 1000*1000 image looks the same full-scaled on
a proper inkjet a4 or letter-sized printout.
Lets take a colour image printed on a home-printer => it will have at
most 100 LPI (actually more like 80-90).
11.7*100 = 1170
8.3 *100 = 830
So, a 1170 x 830 pixel colour image will print optimally on any
home-printer.
Lets take now a professional image-setter with 150 LPI:
11.7*150 = 1755
8.3 *150 = 1245
Any resolution higher than this is NOT useful, as the printer driver or
printer processor will firstly scale down the image and then print it.
In order to construct the various colours, the printer combines lots of
dots, i.e. a 600 DPI will combine at least 6*6=36 dots to create 37
levels of gray (it is similar - though more complex - for colour
prints).
Hi Leonard,
not sure what you're referring to as a "home-printer", but 2880 dpi
is becoming standard for better inkjets, as well as hexachrome or
other more-than-four-color systems. Do the math, add
halftoning/dithering and the fact that inkjet technology is able to
mix color in a single spot - I'm sure I'll be more happy having the
printer driver doing the down-scale & catering for the process
specificities than Impress (I don't even mention mention monochrome
images, where surely the printer can use its full dpi).
This is not to say that I want Impress to be a professional image
manipulation program; it's merely cautioning us to hard-code a value
that has been come by via a very limited experiment (that did not
even include inkjet printing), without asking the user & in an
environment with ever-increasing resolutions...
Cheers,
-- Thorsten
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