Simon M. Campden-Main wrote:
Well, there's the meat of it, isn't it? I wonder how Paint Shop Pro comes
up
with PPI (Image - Image information). I have several thousand scanned
images
with resolution ranging from 72 PPI up to 1200 PPI (As reported by Paint
Shop
Pro) and want to discard, or more likely tag as rejected, any that suffer a
resolution of less than 150 PPI. As you might imagine, I find the thought
of
doing it manually with Paint Shop Pro repugnant.
PPI or pixels per inch is a printing term. It has nothing to do with
viewing on a monitor as a monitor's pixel setting is your set
resolution, as in 800x600, 1024x768, 1600x1200.. etc. This is a
constantly debated urban legend. A pixel on a monitor is a pixel...
Pixels per inch are used in the printing world and relates to how many
pixels are used to provide one inch of printed space. Obviously, at
least up to the limits of the printer being used, a high PPI setting
produces a higher quality 'printed' image.
If you don't believe me, use your paint program, change the PPI of an
image and notice how the image doesn't change size on the screen. Also,
do this and switch the image size display back and forth between inches
and pixels.. the pixel count doesn't change, only the inches change..
but again... that's the printing world and has nothing to do with
display on a monitor or webbrowser.
So, an image 10,000pixels by 10,000pixels will be huge on screen. If set
to a resolution of 1000ppi, the image would be printed at 10" x 10", but
you still can't view the whole image on a monitor without zooming out.
If resolution we set to 10,000dpi, the image would print as 1" x 1", but
you still wouldn't be able to view it on a monitor (unless you have an
awesome multi-display setup that can reach 10,000 pixels wide and tall).
That's the bottom line.
So, I keep seeing 'display size' when I'm thinking the term should be
'printed size'.
John Hinton
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