1、Definite the picture precision is 300 dpi.
　 2、Definite the picture pattern is CMYK pattern.
　 3、Definite solid area( as pure yellow, pure black etc.) has no other mottled color.
　 4、The document should be the PSD file form with the layer not to be merged.
　 5、The writing explanation in picture had better not be completed in Photoshop because word can 　　　　　　　change woollen after converting.Photoshop general contains image category. If it is the printing page,it will be better that handles image, graph and writing to use difference software.
　 For the printing image, it is the most important that the problem of the dimension of image and the resolution of image; Normally calculating formula is: resolution = number of sceen line * (1.5-2). 　　　　　　　　　　　　　　Secondly, the colored image must be CMYK color pattern.Black and white image is the pattern of gray scale if there is no special requirement.The image of line subject such as barcode must be a format of dot matrix which resolution is more than 1200dpi and color pattern is two-value (Bitmap). Also the dot arranged in pairs or groups is the most important factor of affecting the quality of image
　 All the factor inclding contrast,size of dot, gray balance data of CMYK dot arranged in pairs or　 groups must be accommodated with printing technology.For instance,If we use the offset paper to　 print, the general dot contrast is between 5%-85%.If we use the coated paper to print, the dot ontrast is between 2%-98%.