>>>>> "Jon" == Jon Winters <[EMAIL PROTECTED]> writes:
Jon> On Fri, 12 Apr 2002, Amit Mukherjee wrote:
>> Hi,
>> Can anyone tell me the difference between dpi, ppi and
>> lpi ? If my intention is to print a picture measuring
>> 8"x10", at what resolution should I scan ?
Jon> dpi = dots per inch
Jon> ppi = pixels per inch
Jon> lpi = lines per inch
DPI is normally used for scanners, printers, and monitors. LPI is
normally used for half-tone screened images. A 100 LPI half-tone
image corresponds to a much higher DPI rating.
Jon> to know the minimum you need to scan you'll need to know what
Jon> sort of dpi your printer is capable of printing.
Jon> Lets say its an ink-jet that'll handle 1000dpi To print an
Jon> 8x10 without having to scale the image up or down to make it
Jon> fit you'll need to scan...
Jon> 8000 x 10,000 pixels!
Jon> Pretty easy eh?
For most practical purposes, 300dpi for a color print is more than
good enough. Scaling the image to fill whatever resolution you need
for your printer should cause no problems. If you have a 300dpi image
(at print scale), and produce a fiery from it, you will be completely
happy with the results. For photographs, I typically scan the 35mm
negatives at 2400dpi and print up to 8x12 with no perceptible loss.
roland
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