Any raster image is composed of pixels. These are tiny squares composed of a single color that, when grouped in certain patterns, appear as images. Photograph images, as seen on a computer, are raster images. If one were to zoom in very close, these individual pixels become visible. The amount of resolution a photo has is determined by the size of the pixels in relation to the size of the image. A high resolution indicates that there is a high ratio of pixels to image size, and thus the picture will look smoother and more detailed.
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