On Sunday 18 September 2005 11:01, Bob Whitmire wrote:
> Seems like the E-1 was designed for pro use, so it's resolution ought to be
> fine, but this editor is specific in her desire for a "large 300 dpi
> image," and so I've played with my programs and found I'm able to register
> 300 dpi by using interpolation programs, but also by just clicking on
> resize in PW Pro and entering 300 instead of 240. After saving the image,
> when I bring it up again it says it's 300 dpi. I can't tell a dime's worth
> of difference between the two images, but you know how magazine editors
> are.
<<snip>>
> So, if anyone's feeling a bit patient, and also feels godlike in the desire
> to watch out for little children, fools, and ignorant photographers, I'd
> appreciate a little no-nonsense straight poop without all the truly
> scientific lingo that causes my brain to shut down.
A digital image's viewed dimension in inches (horizontal or vertical) is
calculated by dividing the number of pixels in that dimension by the
resolution in dots per inch (dpi). When you set the dpi figure in PW Pro, you
are changing the (suggested) printing resolution, and therefore, because the
number of pixels is not changed the (suggested) printing dimensions of the
image will change, hence this is termed a "resize" operation.
The resolution figure you supply is stored in the jpeg file, and most image
printing software will use this as a default value for printing. Your image
as viewed on the screen will not change, because the pixel pitch of the
monitor is fixed, and the number of pixels in the image are unchanged.
So if you had a 2000 x 3000 pixel image printed at 240 dpi this would yield an
image sized 8.33" x 12.5", and resized to 300 dpi, the image would be 6.67" x
10". On you monitor, at a fixed 100dpi, the image would appear at 20" x 30".
What your editor is looking for, is an image that is sized (in pixels) such
that when printed at 300dpi, it will have at least the desired publication
size. Your "300 dpi" setting in the jpeg file is irrelevant, as it is only
asuggestion which can and will be changed by the people composing the
publication using your pixel data.
O.K. as I said to my dear one, "To air is human, to stink divine", and I'm
feeling godlike now.
--
Parzival Herzog
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