px, pt, dp
iOS’ design measures in pts, Androids in dp, and design for the web is done in px but what do they mean and what is the difference?
px (Pixels)
ppi (Pixels Per Inch)
pt (Points)
dp (Density-independent Pixels)
CSS pixel (logical pixel)
a CSS pixel (logical pixel) is exactly equal to a physical pixel when viewed on a screen with 96 pixels/inch.
参考
- What is px? What is a pt? What is dp? | Medium
- What is the difference between “px”, “dip”, “dp” and “sp”? | Medium
- The Ultimate Guide To iPhone Resolutions
dip (Dots per inch)
1 inch = 2.54 cm
- 一般显示器为96左右
- Desktop 23″ 1920×1080 = 96
- Laptop 14″ 1920×1080 = 157
- MacBook Air 13.3″ 1440×900 = 128
- 喷墨打印机 300 - 720
- 激光打印机 600 - 2400
22.5英寸16:10显示器dpi：
参考
Papersize
- A4 96dpi = 794 x 1123
- A4 72dpi = 595 x 842
参考