Photographic printing plays a very extensive role in the advertising sector, playing a crucial part in promotional efforts. As you enjoy various indoor or outdoor advertisements, how much do you know about the photographic printing work within the advertising industry? Now, Hanfeng Advertising introduces the basics of photographic printing.
Do photo printing files require a bleed in the production process?
Shanghai Printing Company typically leaves a 10CM white margin around the clean image edge during outdoor advertising output. Clients may discuss with us.ShanghaiThe sign printing company has agreed on how much edge to leave for grommet holes, priced by square meters, so the image dimensions can be in centimeters. The photo output images also do not require bleed, so design them according to the actual size. Therefore, no bleed is needed for the photo sign printing work.
2. Materials used in photo printing and large format graphics
In outdoor photo printing, the inkjet inks used ensure the longevity of the printed images, usually making the colors slightly darker than those displayed on monitors. The actual image resolution typically requires only 30-45 DPI (compared to printing standards). These prints are mostly used indoors, so the output pages are generally a few square meters in size, with 1.5 meters being considered wide format. PP paper and slides are commonly used as media, and water-based inks are employed. After the image output is complete, it must be laminated and mounted before use. The output resolution can reach 300-1200 DPI, and the print quality is highly saturated and clear. The different models of photo printing equipment may affect the resolution to some extent.
What are the requirements for the image mode of the photo printing file?
All large format printing is to be done in CMYK mode, with RGB strictly prohibited. Most写真 printing equipment now uses four-color printing.ShanghaiThe digital printing company will adjust the image colors to closely match the proofs. Photography can be done in CMYK mode or RGB mode. Alternatively, when using CMYK mode, note that the value of "crimson" in RGB should be defined in CMYK as M=100, Y=100.
What are the requirements for image storage for photo printing files?
The files can be saved in TIF format, but for easier transmission of photo-quality images, JPEG format (quality must be 8 or above) is also available. Files in Coreldraw, Freehand, and Illustrator formats must have all text converted to curves.
What are the image resolution requirements for photo printing files?
Because photo printing equipment typically requires 11.25 DPI, 22.5 DPI, or 45 DPI for image output, using an appropriate image resolution can speed up the graphic creation process. Photos generally require a resolution of 72 DPI per inch. If the image is excessively large (e.g., when creating a new image in Photoshop, the file size exceeds 200MB), you can reduce the resolution slightly to keep it under 200MB.
What are the requirements for the black parts of the image in a photo printing file?
In both digital printing and photographic images, it is strictly prohibited to use a single black value. It is mandatory to add C, M, and Y colors to create a mixed black. For instance, for a deep black, it can be achieved as follows: C=50, M=50, K=100. Particularly when using it in Photoshop, to avoid horizontal lines on the black areas of the image that could affect the quality of the photographic print, be sure to use a four-color black for the black areas.
