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DPI Formula:
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DPI (Dots Per Inch) is a measurement of screen or printer resolution that indicates how many individual dots can be placed in a line within the span of one inch. It's an important metric for determining the sharpness and clarity of displays and printed materials.
The calculator uses the DPI formula:
Where:
Explanation: The formula converts the physical measurement from centimeters to inches, then divides the pixel count by this value to determine how many pixels fit within one inch.
Details: DPI calculation is crucial for understanding display quality, ensuring proper image resolution for printing, designing responsive interfaces, and comparing different screen technologies.
Tips: Enter the number of pixels along one dimension and the corresponding physical measurement in centimeters. Both values must be greater than zero.
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. However, the terms are often used interchangeably in digital contexts.
Q2: What is considered a good DPI for displays?
A: Standard monitors typically have 72-96 DPI, while smartphones often have 300-500+ DPI. Higher DPI generally means sharper images and text.
Q3: How does DPI affect image quality?
A: Higher DPI means more pixels are packed into each inch, resulting in sharper, more detailed images with less visible pixelation.
Q4: Can I calculate DPI for both dimensions?
A: Yes, you can calculate horizontal DPI (using width measurements) and vertical DPI (using height measurements) separately.
Q5: Why convert cm to inches in the formula?
A: DPI is measured in dots per inch, so we need to convert the metric measurement (cm) to inches to maintain consistent units.