Quote:
Originally Posted by bloodhound31
So, a couple more questions..
Dots per inch...how big is a dot? Does each dot get bigger as you reduce the DPI?
Per inch....300 dots in an inch (Square inch of print?) doesn't seem like a lot. Or does it mean the inch is 300 dots hight by 300 dots wide?
Or to ask another way, are there 300 dots in a linear inch? (300 x 300 = 90,000 dots in a square inch of printed area?)
Cheers.
Baz.
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Dpi is a nominal value that is used mainly for printing and is the number of dots per linear inch in both planes so in a square inch there is technically 90000 dots.
As for the size of the dots technically the dot is the same dot no matter how many you have in the inch. However depending on the algorithm used by the computer or printer to display a dot the actual dot size will be expanded by many more dots to fill the available space. Watch the effect as you zoom in on a picture. You will eventually see the individual pixels displayed with many pixels for each of the originals.
If your picture is 600 x 600 pixels and your printer is set to print at 300 dpi the printed picture will be 2" x2" but if you print it at 100 dpi the picture will be 6" x 6". However there won't be any noticeable gaps in the picture because the printer will convert each dot into a mattrix of 3 x 3.
This may not be the same for all printers. Some advertise printing resolutions of 1200 by 600 dpi. So the printer will work out how many dots it will need to print to represent each pixel of the original picture.
Barry