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Q: Information about DPI and Pixels per Inch. ( Answered,   2 Comments )
Subject: Information about DPI and Pixels per Inch.
Category: Computers
Asked by: fat55-ga
List Price: $2.00
Posted: 21 Jul 2003 04:36 PDT
Expires: 20 Aug 2003 04:36 PDT
Question ID: 233266
My windows 98 software does not allow for the display of DPI. It shows
resolution in pixels per inch. I am working on Photoshop 6.0. Is there
any trick to make it show resolution in dpi or 300 pixels per inch is
as good as 300 dpi? I have posted two question last weeks and did not
receive any confirmation.

Request for Question Clarification by techtor-ga on 21 Jul 2003 05:14 PDT
Sorry to hear that your two questions were ignored. Questions often go
that way at the price of $2.

Let me just confirm, are you looking for the DPI instead of Pixels
display mode in Photoshop? Or are you looking for that kind of display
info in Win 98?
Subject: Re: Information about DPI and Pixels per Inch.
Answered By: feilong-ga on 21 Jul 2003 21:25 PDT
Hi Fat55,

The following are terms pertaining to resolution. I've included other
terms here for clarity. Pardon me if you already know the following:

SPI (samples per inch) is scanner and digital image resolution. To
scan an image the scanner takes a sampling of portions of the image.
The more samples it takes per inch, the closer the scan is to the
original image. The higher the resolution, the higher the SPI.

PPI (pixels per inch) is the number of pixels displayed in an image. A
digital image is composed of samples that your screen displays in
pixels. The PPI is the display resolution not the image resolution.
(Adobe Photoshop uses PPI and Corel Photo-Paint for example uses DPI
for image resolution so it's no wonder most users are confused.)

DPI (dots per inch) is a measure of the resolution of a printer. It
properly refers to the dots of ink or toner used by an imagesetter,
laser printer, or other printing device to print your text and
graphics. In general, the more dots, the better and sharper the image.
DPI is printer resolution.

LPI (lines per inch) refers to the way printers reproduce images,
simulating continuous tone images by printing lines of halftone spots.
The number of lines per inch is the LPI, sometimes also called line
frequency. You can think of LPI as the halftone resolution.

(Excerpted from "Desktop Publishing - Resolution Inch by Inch" by
Jacci Howard Bear,, copyright 2003)

About, Inc.
"Resolution Inch by Inch - Part 1: samples, pixels, dots and lines per

As the comment below implies, 300 DPI and 300 PPI are interchangeable
terms and are basically the same.

Search strategy:

Personal knowledge - I've answered a similar question before about to
this topic

I hope this helps you. Should you have any comments/questions, please
feel free to post your clarification before rating this and I'll
attend to you as soon as possible. Thanks for asking.

Best regards,
Subject: Re: Information about DPI and Pixels per Inch.
From: christophe1969-ga on 21 Jul 2003 13:25 PDT
300 pixels per inch is in fact the same thing as 300 DPI (Dots Per Inch).
Subject: Re: Information about DPI and Pixels per Inch.
From: grouse-ga on 26 Jul 2003 00:40 PDT
300 dpi and 300 ppi are not the same, especially to Photoshop. The
difference is explained in the answer.

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