All images are made up of pixels on the computer screen, or dots when something is printed. When measuring resolution we use two terms. These terms are DPI, which refers to dots per inch, and PPI refers to pixels per inch . It goes without saying that higher quality images will have a greater concentration of pixels or dots in each inch of the image.
If you are viewing files over the computer, the screen is most likely displaying an image at 72 pixels per inch, which is the default value for images that are meant to be viewed over the computer. Computer images do not need to go any higher than this because a higher resolution does not display any better on the computer. This, however, is not the case with printed materials.
Although it is possible to print images at low resolution, this is not recommended. You generally want to raise the resolution to be at least 300 dpi. You should not use resolutions lower than this because otherwise, the printed image will not look sharp. It does not matter what the original dpi is, since you can raise this number in a graphics program like Photoshop. Be aware, however, that if you raise the resolution for an image, the size of the image will shrink. You therefore should pick large images to work with.
For professional printing, I generally prefer to use Vistaprint Coupons, since I can get some great deals every time I use Vistaprint for my printing needs. I recommend using online printers because they cost less than other printers, and also do very good work. The best way to find Vistaprint Coupons is by going to a search engine or going to a coupon site.
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