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)

 

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.

 

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.

 

 

 

 

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.