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Resolution, Pixels and Mega Pixels in Digital Photography
By norman | March 31, 2009
Many people don’t know the difference between image resolution and picture actual dimensions. Sometimes, clients come in a digital photography workshop and ask for an image of 300 dpi, not realizing that this only refers to pixel density and gives no idea about the actual size of the picture. When it comes to a digital image, it’s harder to actually transmute it mentally in real physic dimensions. When talking about a classic picture, we can for instance say that is has 13 x 18 centimeters and everyone understands what we’re talking about. But in digital photography, saying an image is 20 x 30 centimeters makes no sense the same way as saying it has 300 dpi doesn’t make any sense.
the provenience of the word pixel comes from “pictures elements”, for short, Pixel, and these are considered to be the smallest divisions of a digital photography image. So, in order to obtain an absolute and accurate measurement of a digital image, we will use pixels instead of centimeters. Saying an image is 300 x 150 pixels gives an idea about its digital shape. But people can’t tell how much a pixel means, because there are no real tangible dimensions to define it, so we also use picture resolution.
Resolution means the density of pixels per inch. This is what the previously mentioned 300 dpi means, the resolution of a certain digital image. With all the variables available, real life dimension can be calculated, for example when we want to print a picture and we are not sure what paper format fits it best.
When digital photography was still young, the greatest problem producers faced was coming up with digital captors. Since then, even if the mega pixel number increased a lot, it is still essential. Nowadays, most digital cameras have this number written on them, and it shows what the maximum density of pixels that apparatus can collect at a certain moment is. (When taking a picture).
We are all accustomed to ask how many mega pixels a camera has and then immediately decide if we want it or not. Spicy prices and a big mega pixel number don’t necessarily sell the best digital camera, you should look at battery life, at accessories and brand also. photo printing online
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