GRA 323 Lecture Notes - Lecture 3: Digital Image, Phenylalanine, W. M. Keck Observatory
11 Feb 2013
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Document Summary
When photos are digitized, they become bitmap images. Bitmap images are made up of pixels, and they have resolution restrictions. Sizing and cropping takes into account the finite nature of bitmaps to ensure they meet the resolution requirements for print. Sizing of an original is expressed as a percentage change. When sizing an original, both dimensions must be scaled at the same percentage, or else the image will become distorted. Anamorphic distortion: when one dimension is scaled differently than the other. Anamorphic distortion is generally done only to purposely distort the image as a special effect, or in minute amounts in order to fit an exact box dimension. When expressing the dimensions of a photo, the width is always expressed first. Ex: a 10 x 8 photo would be 10 wide by 8 high. Landscape orientation: an image that is wider than it is tall. Portrait orientation: an image that is taller than it is wide.
