All About Photography

Errors not surprise me that even today continue reading (and hearing) a lot of people is the resolution of a picture . For starters, there is much confusion about what we mean by this term. Well, simply refers to the total number of pixels that has the photo. For example, a 12 Mega Pixels camera generates a file of, say, 4,000 pixels x 3,000 pixels = 12,000,000 pixels. The resolution of that photo (or more precisely, the file) is 12 million pixels.

Resolution

But often you’ll hear someone who has asked you a picture (even an advertising agency!) Say that “I better with 72 points per inch . ” This information is useless. What we have to say is how many pixels you want to take the photo. For example: 1,500 pixels wide or 800 pixels high. This data perfectly defines the resolution of the file that you send. As an example, these pictures have a resolution of 900 x 600 pixels, a size suitable for the Internet.

And the dots per inch?

The question then is, what resolution do I need? Depends on what it is going to use the photographs : for viewing on the monitor or to print ? And here come into play dots per inch (also called dpi or ppi).

In a monitor , the screen resolution is just the number of points that the monitor displays (eg 1024×768) and dot density (measured in dpi) is the number of dots displayed on a monitor inch (2 , 54 cm). For example, the monitor with which I am writing this article is set to a resolution of 1280×1024 pixels screen. Now I take a ruler and see how tall the width of the monitor: 38.1 cm = 15 inches. So the horizontal resolution of my monitor is 85 dpi (1.280/15 = 85 dpi). You see, the famous 72 dpi we have all heard or read (as resolution of a monitor) is not true: depending on monitor size and screen resolution you have set the user (in fact it is the 72 dpi the time of the first Macintosh did have a screen resolution of 72 dpi, but later ceased to be true to evolve monitors).

And to print what resolution I use?

This question has no single answer. Yes we can talk about minimum recommended resolution for each output type. For example, to print a photo with an ink jet printer , a resolution of 150-180 dpi is sufficient. To offset or print (magazines, books, etc..) recommends between 200 and 300 dpi. However, to print a billboard just 50 dpi or less. Again, the myth of the 300 dpi for printing anything is totally false.

Calculate print size resolution knowing

Finally, we calculate what we need resolution file to print a photo to A4 size, with an ink jet printer, 150 dpi:

A4 = 29.8 cm = 11.8 inches wide.

For a density of 150 dpi need the photo is on the long side = 150×11.8 = 1770 pixels

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