In the printing operation, the resolution is the primary consideration. Using too low a resolution will reduce image quality and make the final printed product look blurry. So what is the appropriate resolution of the printing? This question depends on the required printing products.

Resolution unit

Ppi（Pixel per Inch）and dpi (dots per inch) are often mixed. From a technical point of view, "pixels" (p) only exist in the computer display field, while "dots" (d) only appear in the printing field.

What is PPI?

(Pixel per Inch). Refers to the number of pixels in the length of the digital image * the number of pixels in the width, which represents the logical size of the image. It is the most commonly used indicator for measuring image resolution when printing digital files. For example, a 1 square inch image will contain 90,000 pixels when printed. The higher the PPI, the denser the pixels are packed, resulting in a higher definition image.

Some common printing resolutions:

The web page uses a resolution of 72dpi. Newspapers use a scanning resolution of 125-170dpi.

For printed images, set the resolution to 1.5 to 2 times the screen line (lpi). 85lpi for newspaper printing.

Magazines/publicity materials use a scanning resolution of 300dpi, because magazine printing uses 133 or 150lpi.

The scanning resolution used for high-quality book printing is 350-400dpi, because most of the beautifully printed books use 175 to 200lpi for printing.

The scanning resolution used for wide-format printing is 75-150dpi. For large-format images (such as posters) that are viewed from a distance, the low resolution is acceptable, and the low scale mainly depends on the viewing distance.

Since images are used for different purposes, the resolution should be determined according to the purpose of the image. Generally, 300 pixels/inch are required for printing, and 72-150 pixels/inch for photo; inkjet printing is available from 20 to 72 pixels.

Why should it be 300dpi Image?

If you’re trying to print something that has a resolution of less than 300dpi (dots per inch), the odds are that the image is going to be pixelated (that’s technical jargon for blurry). If artwork is less than 300dpi, we would always recommend you have your printed products redesigned for the best quality materials.

The image resolution setting should be appropriate. If it is too high, the running speed is slow, and the disk space occupied is large, which does not meet the principle of high efficiency; the resolution is too low, which affects the expression of image details and does not meet the principle of high quality.

Please feel free to contact us to know more about the printing knowledge before starting your printing project.