Commonly used image file format and image resolution in color box packaging design

Color box packaging planning commonly used picture file format and picture resolution?

1、What is picture resolution? Why emphasize it?

Answer: Higher resolution pictures include more pixels than lower resolution pictures of the same scale, and the picture information is also more, reflecting the details more clearly, which is one of the reasons for considering the output elements to determine the picture resolution. Such as a picture for display on the screen, the resolution of 72 pixels / inch can be; if used for 600Dpi printer output, the need for 150 pixels / inch of the picture resolution; if you want to print, the need for 300 pixels / inch of high resolution. Picture resolution should be set appropriately: if the resolution is too high, the operation speed is slow, taking up a large disk space; if the resolution is too low, then, affecting the expression of the details of the picture, can not meet the corresponding quality requirements.

2, why do pictures need to have a picture file format? Pre-press often touches the picture file format has several kinds, what is the nature of each?

A: The picture file format resolves how the file is compatible with a variety of application software, how the file with other documents to exchange data. Because the pattern of the picture has many, should be based on the picture of the use of the resolution of the picture should be stored for what pattern.

Commonly used in the planning of the picture file format:

TIFF pattern: TIFF is a picture file with labels to save the picture composed of color channels, its biggest advantage is that the picture is not subject to the constraints of the operating channel, regardless of the PC, MAC machine or UNIX machine, can be universal. It can save the Alpha channel, can be stored in a file color data, is the most commonly used graphic pattern for printing documents.

EPS pattern: EPS pattern is used for printing and printing, can save Duotone information, can store Alpha channel, can store the route and screening information.

GIF is an 8-bit format that can only express 256 levels of color. It is a commonly used pattern for network dissemination of drawings, and generally cannot be used for printing.

PSD is used as an intermediate transition of the picture file to save the channel and layer of the picture, in order to make corrections in the future. The pattern is poor, as long as Photoshop can use it, few other applications to support it, and can not be used directly for printing output.

JPE is a file format, but also a method of tightening, this tightening is lossy, loss of size varies, some small enough to the human eye can not distinguish, can not be used directly for printing output.