Works designed with photoshop should pay attention to the following points before delivery to print.

1. Make sure the picture accuracy is 300dpi / pixel / inch

2. Make sure the picture mode is CMYK mode

3. Make sure that the solid bottom (such as pure yellow, pure black, etc.) has no other noise

4. The file is preferably a PSD file format of unmerged layers

5. The text description in the picture should not be completed in Photoshop, because once it is converted to the picture format, the words will become hairy.

Photoshop files generally only contain image categories. If you are making a printed page, it is best to use different software to process images, graphics, and text.

For delivery of printed images, the most important thing is to pay attention to the resolution and image size of the image; the general calculation formula is: resolution = number of screen lines × (1.5-2). The second is the problem of the color mode; the color mode of the color image should use the CMYK form.

Black and white images, if not specifically required, are generally in grayscale mode. For linear manuscript images such as bar codes that must be expressed in the form of dot matrix images, the general resolution is not lower than 1200 dpi, and the color mode is binary (Bitmap). Furthermore, the dot matching is also a very important issue that affects the image quality.

For the CMYK dot matching situation of contrast, dot size and gray balance data, it must match the subsequent printing process. For example: if offset paper is used for printing, the dot contrast is generally between 5% and 85%; if it is coated paper, the dot contrast is between 2% and 98%.

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