The question "What is a good pixel size for printing?" might seem straightforward, but the answer depends on several factors. It's not just about Resolution, but also DPI, PPI, and the type of printer you're using. Let's dive in.

First, we'll clear the confusion between Resolution, DPI (Dots Per Inch), and PPI (Pixels Per Inch). Resolution refers to the number of pixels in an image, while DPI and PPI are measures of pixel density. DPI is used for printed output, while PPI is for on-screen display.

Understanding Resolution and DPI for Printing
Resolution is typically expressed in pixels (e.g., 3000 x 2000). To determine the actual print size, you need to know the DPI at which it will be printed.

Common DPI Settings for Print
Most commercial printers and high-quality home printers expect images set to 300 DPI. This is the standard for-producing high-resolution, sharp prints. However, some printers may require higher DPI for certain tasks:

- Text and Fine Details: 600-1200 DPI for crisp, clear results.
- Large Format Printing: 150-300 DPI for posters and banners.
Calculating Print Size
To calculate your print size, divide the image's pixels by the DPI:

Print width = Image pixels / DPI
For example, an image that's 3000 pixels wide, printed at 300 DPI, will be approximately 10 inches wide (3000 / 300 = 10).
PPI and On-Screen Display

PPI is used to describe the pixel density of an image on screen. The most common standard is 72 PPI, designed for monitors with a 72 DPIfake screen resolution. However, modern displays can handle higher PPI without loss of quality.
Retina Displays









Apple's Retina displays use 300-326 PPI. To ensure images look crisp on these screens, they should be at least double the display's resolution. So, for a 2560 x 1440 screen, you'd need an image at least 5120 x 2880.
Web Design and Email
For web and email displays, 72 PPI is still the standard. However, vector graphics can scale without loss of quality to any size. Use vector formats (SVG, EPS, AI) for logos and icons to maintain crispness at any size.
Remember, higher resolution doesn't always mean better quality. It depends on the output and display method. Always consider your audience and their viewing setup. Now you're equipped to make informed decisions about pixel size for printing and on-screen display.