"Journalist-North" writes:

SNIP
Thus an image of 1600x1800 @72ppi image will tell you (in the image
properties in the editor) that it is ca 22x25 (printed) inches when scaled
at 100%, BUT, the exact same 1600x1800 image @300ppi will tell you that it
is 5.3x6 (printed) inches when scaled at 100% - AND there is no re-sampling
done to get there. It is merely a scaling value for printing purposes.
Further, you can also set your printer to print that image at various
resolutions in dots per inch - whereupon the PRINTER DRIVER makes changes by
interpolation to the image file between receiving it in the print queue and
transmitting the data to the actual print heads - this is something you have
only very limited control over and only by changing print quality parameters
in the printer dialog between, say, draft quality and photo quality outputs
and altering (usually) the selected paper type to accommodate the print
quality (e.g. plain paper or photo paper). The printer, in turn, computes
the way that each pixel is managed as far as the inks, and quantity of inks,
laid down on the actual paper output.

Okay, so now I remember why I can't remember the answer.


So far I have not talked about making changes, except for the printer
SNIP

Yeah, that's why I can't remember, alright.

Using the same image I used above: 1600x1800 image @300ppi the image
properties will tell you that it is 5.3x6 (printed) inches when scaled at
100% - I could command this to remain at 300ppi resolution but change the
print size to, say, 10x12 (a multiplier of 4x total pixels and a dimension
multiplier in each direction of 2x) and that image will then have apparent
values of ca 3200x3600 @300ppi - the extra pixels are created out of some
(usually selectable) resampling algorithm - but they are nevertheless
machine created and incorporated into the original image. The native print
size, scaled at 100% in the printer, is then as selected, 10x12inches
@300pixels per inch.

Uh, thanks for the reminder. :-

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