1. What is DPI?

DPI (Dots Per Inch) is a measurement of resolution that indicates how many individual dots can fit into a 1-inch line. It's commonly used to describe the resolution of printers, scanners, and digital images.

2. How Does the Calculator Work?

The calculator uses the DPI formula:

Where:

• \( Pixels \) — Number of pixels in one dimension (width or height)
• \( Physical\ Size \) — Actual size in inches of the same dimension

Explanation: The formula calculates how many pixels would fit in one inch if the image were printed or displayed at its actual size.

3. Importance of DPI Calculation

Details: Understanding DPI is crucial for ensuring proper image quality in printing, scanning, and display applications. Higher DPI generally means better quality but requires more resources.

4. Using the Calculator

Tips: Enter the number of pixels in one dimension (width or height) and the physical size in inches of that same dimension. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between DPI and PPI?
A: DPI (Dots Per Inch) refers to printer resolution, while PPI (Pixels Per Inch) refers to screen resolution, though they're often used interchangeably.

Q2: What is a good DPI for printing?
A: 300 DPI is standard for high-quality printing. 150 DPI may be acceptable for large format prints viewed from a distance.

Q3: Does DPI affect digital images on screens?
A: No, screen display depends on pixel dimensions and screen PPI. DPI only matters when printing.

Q4: Can I change DPI without changing image quality?
A: Yes, DPI is just metadata unless you're resampling the image (changing pixel dimensions).

Q5: Why does my image look blurry when printed?
A: This usually means your image doesn't have enough pixels for the print size at the desired DPI.