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Date Posted: 20:34:27 09/26/01 Wed
Author: Michel
Subject: Re: Line screening
In reply to: Rich 's message, "Line screening" on 12:57:58 09/26/01 Wed


Hi Rich,

I am the one who does not understand. I have had very little interaction with printers. I assume that "screening" meant just changing the resolution to a resolution appropriate for printer.

I don't know anything about LPI. I don't think Envision will provide help in this area.

Best regards,

Michel

>Thanks Michel but I think we are on different topics
>or I don't understand.
>
>Here is more of what I think I know: Offset printing
>presses cannot print grayscale so grayscale images
>either real photos or digital versions need to be
>converted to descrete black and white images. The
>process of converting the grayscale images (in several
>image processing utilities we have) is call lines
>screening. We set the LPI which is different than the
>DPI to what ever the guy with the printing press says
>his press can use. We also say whether to use
>diagonal, vertical or horizonal lines. Then we run
>the process and the image is converted to a format
>that under a magnifier looks like varying width lines
>and to the naked eye looks like the image. Obviously
>the higher the lpi the better it looks.

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