扫描仪扫描文件处理-A4分辨率

转换公式：毫米转英寸，英寸乘以DPI(每英寸点数)

1英寸 = 2.54 厘米 = 25.4 毫米

例子(600dpi)：mm: 210x297 = px: 4961(210/25.4*600)x7016(297/25.4*600)

 

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Home > Paper Dimensions > A4 Paper Dimensions in Pixels

A4 Paper Size in Pixels Because the size of paper varies depending on the Pixels Per Inch of the setting in Photoshop, there is no defined size for A4 paper in Photoshop or MS Paint. Instead, The table below displays the dimensions of A4 paper in pixels at different Pixels Per Inch (PPI or Dots Per Inch). Each pixel count is in 8 bits of colour. You can change the color mode in Photoshop when creating a new project.

 

Paper Size Type	Paper Width	Paper Height
A4 Dimensions @ 72 DPI	595 Pixels	842 Pixels
A4 Dimensions @ 200 DPI	1654 Pixels	2339 Pixels
A4 Dimensions @ 300 DPI	2480 Pixels	3508 Pixels
A4 Dimensions @ 400 DPI	3307 Pixels	4677 Pixels
A4 Dimensions @ 600 DPI	4961 Pixels	7016 Pixels
A4 Dimensions @ 1200 DPI	9921 Pixels	14031 Pixels
Letter Size @ 72 DPI	612 Pixels	792 Pixels
Letter Size @ 200 DPI	1700 Pixels	2200 Pixels
Letter Size @ 300 DPI	2550 Pixels	3300 Pixels
Letter Size @ 400 DPI	3400 Pixels	4400 Pixels
Letter Size @ 600 DPI	5100 Pixels	6600 Pixels
Letter Size @ 1200 DPI	10200 Pixels	13200 Pixels

Letter size: Canada and the United States of America.A4 size in mm: United Kingdom, Australia, Germany, Singapore, India, United Arab Emirates, Philippines, New Zealand and nearly ever other country in the world.

MM

Inches

CM

Pixels

 

 

 

 

What are Pixels?

 

Pixels are not used for measuring size. One pixel is a small dot of illumination on a display screen. Multiple pixel dots compose an image. This is why Dots Per Inch or Pixels Per Inch is used as a standard. Pixels are most standardised as 8bit in colour in 24bit displays. Each pixel can achieve over 16 million colours in this case.

 

How many Pixels of Bleed for Photoshop?Adding a bleed to Photoshop is as easy as increasing how many pixels surround the space you want to work with. The area surrounding your workspace in Photoshop should always have a bleed of at least 3 millimeters to adjust for printing errors with it goes on paper. But we, and many others, recommend 5 millimeters to adjust for a wider variety of printers.