GCM 111 Lecture Notes - Lecture 1: Gigapixel Image, Digital Image, Pixelation
20 Jan 2018
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Wk (cid:575) pt (cid:576): image capture pt (cid:576) Size and resolution are dependent upon each other. The resolution of a digital image should be twice the line screen that it is printed at. This ensures that the image will look proper when printed. Resolution = 2 * lpi * sf. A digital image is 4 x 5 and will be printed at a size of 8 x 10 at a line screen of 175. Resolution = 2 x 175 x 2 = 700 ppi. Images that are too big can be scaled down. Images that are too small should not be scaled up. When scaling/resizing images, both dimensions should be scaled proportionately. Width and height should be scaled up/down the same amount. Anamorphic distortion: one dimension is scaled differently from the other. When expressing the dimensions of a photo, the width is always expressed first. E. g. a 10 x 8 photo would be 10 wide by 8 high.
