A resolution of 300 dpi will produce a text that will show broken lines visible under a magnifying glass.Even larger resolutions are necessary to obtain reproductions of smooth photographs.Professional graphics use printers with resolutions from 1200 to 2400 dpi.
Pixels or resolution of a photo and printing in centimeters
There is no direct equivalence between the pixels of a digital image and the centimeter of printing that correspond to it.A very small image can be printed very large on paper, but the pixels of the printed image will begin to be noticed at first glance.There are techniques to "enlarge" the digital image and soften it a bit the pixels, but these do not make ma ravillas.
If some calculations can be made so that we can achieve an acceptable quality of image printing, this way we can know how large we could print a digital image before the pixels are noticed too much.
To make this calculation you must know the DPI or PPP (dots per inch) that allows you to print the printer.
From 200 dpi we can say that the print resolution is good , and if we want to make sure we must reach 300 dpi or more.
To know what is the maximum printing resolution that allows a digital image (for an acceptable quality of printing) you have to divide the width of that image by ppp:
For example, we have an image with 1600 pixels wide and the print resolution is 200 dpi, 1600/200 gives us 8 inches, that is, about 20.32 centimeters wide We will achieve with acceptable quality.
If the printing is done at 300 dpi then: 1600/300=5.33 inches is approx.13.54 centimet ros.
Photoshop allows you to do these conversions automatically.I suggest reading this tutorial: Prepare High Resolution Images for Printing
See: Resolution
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