How do pixels convert to dpi?

Information about DPI and Pixels per Inch.

• 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.

• Answer:

  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, About.com, copyright 2003) Source: About, Inc. "Resolution Inch by Inch - Part 1: samples, pixels, dots and lines per inch" http://desktoppub.about.com/library/weekly/aa101800a.htm 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, Feilong