The photoshop document size is the actual size of the washed image, but in actual operation, different settings must be made in color mode and resolution according to different uses. The specific method is:

1. Create a new background file of the required size (take A4 as an example);

2. For printing, set the color mode to "CMYK mode". The color of this mode is closer to the original image. Color, the resolution is 150-300dpi;

3. For inkjet printing, the color mode is set to "CMYK mode", the resolution is about 40, the larger the inkjet drawing, the lower the resolution setting, save ,Finish.