Every day we are exposed to various image formats during the process of purchasing printed images, creating files and pre-checking files, for example: PNG, BMP
, GIF, JPEG, etc. But we often don't know the meaning of these abbreviated letters and which image formats are more suitable for printing production.
Claudia McCue, the author of "Actual Printing Production", not only explained to the reader how to print the ideal job, but also pointed out the problems that the printing plant should avoid in the production process. With the following points, you may not waste too much time in monitoring production.
1. Some image formats are more suitable for use on screens and networks. For example: PNG (abbreviation of Portable Network Graphics, meaning portable network image) can contain image elements such as RGB, index color, and transparency. Although PNG images can reach higher resolutions, they have no support for CMYK color space.
2. Windows format BMP (abbreviation of bitmap) can support color depth from 1 bit (black and white, no gray level) to 32 bit (millions of colors), but does not have support for CMYK, so It is also not suitable for printing.
3. GIF (abbreviation of Graphics Interchange Format, meaning graphics interchange format) is only suitable for use on the Internet, because its original resolution is relatively low, and it can only call up to 256 colors. So don't use GIF images in printing.
4. The name of JPEG (abbreviation of Joint Photographic Experts Group) comes from the committee that created it and enjoys a very high reputation in the printing industry. It is a lossy compression algorithm, in other words, in order to generate a smaller digital file, it will discard some of the information in the image.
5. If an image has a sufficiently high resolution, printing with a slightly compressed JPEG file will not significantly damage the quality of the image, but if there is too much compressed information, there will be a rectangle in the image. Deformation occurs, especially in the detail area.
It can be seen that printing is not a free process. Only by choosing the correct image format can we lay a solid foundation for perfect printing production.
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