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Whats all this DPI stuff?…
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The wonderful world of Wikipedia defines DPI as – “Dots per inch (DPI) is a measure of spatial printing or video dot density, in particular the number of individual dots that can be placed within the span of one linear inch (2.54 cm.) The DPI value tends to correlate with image resolution, but is related only indirectly.”
For more go here –
http://en.wikipedia.org/wiki/Dots_per_inch
Plenty to be going on with there.
the real confusing bit, is that DPI is nothing to do with the resolution of the file your printing
the two often mixed up terms are DPI and PPI
DPI (Dots Per Inch) are how many dots the printer puts on the paper per linear inch
PPI (Pixels Per Inch) are the density of pixels in the digital file per inch
so example
your file maybe at 300ppi, but the printer is set to 1440 dpi,
stcstc wrote:
your file maybe at 300ppi, but the printer is set to 1440 dpi,
Hope you don’t mind me jumping in with a question.
Steve: Is it good to match your printers dpi with the files ppi, or a multiple of it.
Or are they just not connected at all?Martin
my camera.. the canon 400d shoots 72ppi… is this adiquite?… ive just been floating round the net and there seems to be arguments about this. can i change the ppi on my camera itself?.. or is that just something photoshop does. i supose the main question im asking is, is 72ppi less quality then a higher ppi?…
sorry if these are stupid questions.. i know wikipedia and the like are out there but you cant beat a dumbed down explanation from guys that know what ther on about..
Martin
yes you do want to ideally match the native res of the printer, for example epson printers are native 360 (1440 is a multiple) so yes work with ideally 360ppi then the printer isnt introducing rounding errors etc (which chances are you wont notice till about A2 size)
Djbowiz, your camera doesnt shoot at any ppi really its not quite as simple
but you can in photoshop change the PPI of the image
s
djbowlz
All you need to think of is the number of pixels. Say your image has pixel dimensions of 3600 x 2400 which is equivalent to (8.64 million pixels in total) then if you print at 360 ppi, you will be able to print an image which is (3600/360) (2400/360) = 10 x 6.66 inches. If you print the same image at 300 ppi, then it will be 12 x 8. Divide the total number of pixels by the resolution you intend to print at. Hope this helps?Very good.. thanks a mill lads.. ross.. thats pretty helpfull.. when printing just divide the pixel dimensions by ppi to get the best print size to justify the pic.
Thanks again..
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