With the advent of photography in the first half of the 19th century, there was a natural desire to enlarge the image to the size of an art canvas. One of the real and most effective methods, which is still used today, was to redraw by cells, but today they rarely give such advice, because it is obvious that those who want to enlarge an image are interested in how to increase the size of photos on a computer.
Image size on PC monitor
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Specialized Programs
If you need an answer to the question of how to increase the size of photos with a minimum headache, use one of the specialized programs that have more interpolation algorithms than Photoshop and have their own original technologies. In addition to the previously mentioned PhotoZoom Pro program, these are services: Perfect Resiz, Reshade Image Enlarger, OnOne Genuine Fractals Pro v6.0, Akvis Magnifier v3.0 and others.