如何计算Image Resolution

learn.whatIsHeading

Image resolution determines print size and quality. 300 DPI is the standard for professional print; 72–96 DPI suits screen display. This converts pixel dimensions to physical print sizes.

公式

Megapixels = Width (px) × Height (px) / 1,000,000 | File size (MB) ≈ Megapixels × Bytes per pixel / 1,000,000

分步指南

1Print width (inches) = Pixel width / DPI
2Convert to cm: multiply by 2.54
3Megapixels = Width px × Height px / 1,000,000
4Enlarging beyond native DPI causes pixellation

例题解析

输入

4000 × 3000 pixels at 300 DPI

结果

13.3" × 10" print (33.9 × 25.4 cm); 12 MP image

常见问题

What is Image Resolution?

Image resolution determines print size and quality. 300 DPI is the standard for professional print; 72–96 DPI suits screen display

How accurate is the Image Resolution calculator?

The calculator uses the standard published formula for image resolution. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Image Resolution calculator use?

This calculator works with centimetres, inches, watts. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Image Resolution calculator use?

The core formula is: Print width (inches) = Pixel width / DPI. Each step in the calculation is shown so you can verify the result manually.

准备好计算了吗？尝试免费的 Image Resolution 计算器

自己尝试一下 →