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DPI Formula:
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DPI (Dots Per Inch) is a measurement of printing resolution that indicates how many individual dots of ink a printer can produce within a linear inch. In digital imaging, it refers to the number of pixels per inch in an image when printed.
The calculator uses the DPI formula:
Where:
Explanation: This calculation helps determine the appropriate print size for an image based on its pixel dimensions and desired DPI output.
Details: Understanding DPI is crucial for print quality in Photoshop projects. Higher DPI values result in sharper, more detailed prints, while lower DPI may cause pixelation. Professional printing typically requires 300 DPI or higher for optimal quality.
Tips: Enter the pixel width of your image and the desired print width in inches. Both values must be positive numbers greater than zero for accurate calculation.
Q1: What's the difference between DPI and PPI?
A: DPI refers to dots per inch in printing, while PPI (pixels per inch) refers to digital screen resolution. However, the terms are often used interchangeably in Photoshop.
Q2: What DPI should I use for web images?
A: For web images, DPI is less important as screens display pixels directly. Focus on pixel dimensions rather than DPI for web use.
Q3: What is the standard DPI for professional printing?
A: Most professional printing requires 300 DPI for high-quality results. Some large format printing may use lower DPI (150-200) due to viewing distance.
Q4: Can I change DPI without affecting image quality?
A: Changing DPI alone doesn't affect pixel data, but resizing the image to match a new DPI will affect quality. Always work with the highest resolution possible.
Q5: How does DPI affect file size?
A: DPI itself doesn't affect file size, but higher resolution images (more pixels) at the same DPI will have larger file sizes.