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There are several methods to determine the image quality in printing.
Analyze the text quality first. In most cases, they should look sharp at a monitor 3-400% view. Don't compromise on the text quality at any time.
You can pre-determine the resolution quality by simply increase your monitor to 3-400% magnification and then analyze your image. That's how likely to print when you print out. If the image looks clean and sharp then you are good to print. If looks blurry then you need to replace the image or enhance the image quality if all possible.
Most printers are set to print at 300 dpi or higher.
Whenever grab an image from the internet be sure to grab the visually clearest and largest image you can find. For example, if you are looking for a 1-inch x 1-inch image on the print, look for the image size is 300x300 dpi or greater. 600 x600 dpi is good with 2"x2" image. To find the pixel number, put your cursor over the image, or press the right button from your mouse.