The term resolution is mainly used to describe monitors, printers, and bit-mapped graphic images. Is basically referred to the sharpness and clarity of an image. The resolution in the printers, monitors, scanners, and other Input /Output devices is classified as high resolution, medium resolution, or low resolution. The grade of the resolution is constantly changing as the technology improves.
Whether it is a dot matrix or laser printers, the resolution indicates the number of dots per inch. The 300 dots per inch printer can print 300 distinct dots in a line that is 1 inch long, which means 90,000 dots per square inch. You can some time be puzzled when you try to print the picture from the website they turn out to be small. This is not a problem but it is the difference between what is the resolution of the picture that monitor handles as compared to how the printer handles the same. So while you print the picture remember that the dimensions of the picture determine the size it will print and the resolution determines the clarity.
It is rare that we can get 600 or 720 or 1200 or 1440 dots per inch of “image” resolution from the printers in color mode. The multiple printer dots for one image pixel reduce the printer's real image resolution capability to a fraction of the printer's advertised dots per inch. The printer specifications are actual, precise and significant, but they should not to be perplexed with image resolution.
The ink dots in the printer and image pixels are simply quite different and usually one color image pixel requires many printer ink dots. And that’s the reason that one needs a 1200 dot per inch printer (ink dots) to print an image at 250 dots per inch (pixels). Whereas for the black and white printers if you are attempting higher resolutions it simply limits the pixel size area, allowing fewer ink dots, which then limits to even fewer possible color tones. Hence the requirement is for the several ink dots in that space to replicate the correct color of the image pixel.
Inkjet printers being simple devices really need more color depth or color resolution and need a better way to reproduce the color of an image pixel in a small space on paper. They can't use additional pixels and the smaller pixels simply limit their ability to accurately simulate the correct color of each existing image pixel. To get a good inkjet printer, look for the following (1440x720, 2880x720, 1200x1200 dots per inch or 2400 and 4800 dots per inch) for printing Color or Grayscale photo images in high quality mode on good photo paper. There is not much benefit from the larger numbers, not when the ink dots are much larger than the grid to hold them. Sometimes the images vary too, some are sharp and some are not.
A few years ago, the quality of the pictures by the inkjet printers was not that sharp. But today you can get a high quality print from the models on the market today. The latest 6-color photo inkjet printers have indeed became the state of the art for printing photographs at home with a higher image resolution.