Photographic printing plays a crucial role in the advertising industry, with extensive applications. It significantly contributes to promotional efforts. As you enjoy various indoor and outdoor advertisements, how much do you know about the photographic printing work within the advertising sector? Now, Hanfeng Advertising introduces the basics of photographic printing.
Do photo printing files require bleed areas during production?
Shanghai Printing Company typically leaves a 10CM white margin around the clean image edge when performing outdoor advertising output work. Customers may...ShanghaiThe canvas printing company has agreed on how much edge to leave for buttonholes, priced by square meters, so the image dimensions can be in centimeters. The photo output images also do not require bleed, so they can be designed to the actual size. Therefore, no bleed margin is needed for the photo canvas printing work.
2. Consumables for photo printing and large format printing
In outdoor photo printing, the ink used ensures the longevity of the printed image, typically making the colors slightly darker than those displayed on monitors. The actual image resolution usually only requires 30-45 DPI (compared to printing standards). Photos are mostly used indoors, so the printed pages are generally only a few square meters in size, with 1.5 meters being the standard for wide formats. PP paper and slides are commonly used as media, with water-based inks. After the image is printed, it must be laminated and mounted before use. The output resolution can reach 300-1200 DPI, and the photo printing equipment models may affect the resolution slightly, with saturated and clear colors.
What are the requirements for the image mode of the photo printing files?
All large format printing should use the CMYK color mode, with the RGB mode prohibited. Most photo printing equipment now utilizes four-color printing.ShanghaiThe sign printing company will adjust the image colors to closely match the sample. Photographs can be processed in CMYK or RGB mode. Alternatively, when using CMYK, note that the value of bright red in RGB should be defined as CMYK: 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 prints, 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 images at 11.25 DPI, 22.5 DPI, or 45 DPI for 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 (such as when creating a new image in Photoshop, where the file size exceeds 200MB), it's advisable to reduce the resolution to keep it under 200MB.
What are the requirements for the black part of the image in photo printing files?
In both digital printing and photo images, it is strictly prohibited to use a single black value. Instead, the C, M, and Y colors must be added 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 appearing in the black areas of the image, which can affect the quality of the photo printing, ensure that the black areas are printed in a four-color black.
