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Chapter 9. Pictures > Choosing the right resolution for a bitmap picture

Choosing the right resolution for a bitmap picture

For online display, you merely need to match the resolution of the most common monitor that your viewers will use, which in most cases is 72 ppi. For print output, choose one-and-a-half to two times the lpi (lines per inch) your commercial printer plans to use. For example, let's say your printer says they're going to use a 133 line-screen. A color picture should be saved at twice the line screen. 133 times two equals 266, so you should save the picture in its original application at 266 ppi. For a grayscale picture, one-and-a-half times the line screen is sufficient (200 ppi, in our example).

Every rule has its exceptions, however. A bitmap image that contains sharp linear elements will require a higher resolution (600 ppi or higher). For a very painterly picture that contains amorphous shapes, on the other hand, a resolution value that is less than twice the output line screen may suffice.


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