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Old 11-05-2007, 10:46 PM   #1
Join Date: Nov 2007
Posts: 3
Default Line resolution problem


I produce reports to be printed on laser printers. In order to use smallest possible images, I try to figure out what line resolution the printers (Kyocera) use. It's 600 dpi printers so it should be 50-90 lpi. I suppose it can be found in some spec. or in the driver, but I haven't managed to do that.

So I did a simple test. I printed a continious gradient from black to white (4 inches wide on paper) at 200 ppi and the printers made 17 fields of half tones of the image. According to this formula:
number of half tones = (printer resolution[dpi] / line resolution[lpi])^2 + 1
17 = (600/lpi)^2 + 1
the printer uses a line resolution of 150 lpi, and the grid size is 4x4 dots (600/150).

Let's assume this is correct. Having a line resolution of 150 lpi would require 225-300 ppi for the image. I printed with images from 40 to 600 ppi, and they all produced almost identical results (17 half tones).

What is wrong with the theory above, and how can I find the line resolution?

If I print the 40 ppi on a HP laser printer, the gradient is continious, so one conclusion is that Kyocera printers are not made for half tone images.
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