ATLS 2200 Lecture Notes - Lecture 3: Filename Extension, Lossless Compression, Scalable Vector Graphics
11 Sep 2018
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Pixel- picture element- single point in a graphic. Resolution- dpi= dots per inch or ppi= pixels per inch. Web graphics= 72 dpi print= 150 - 300+ dpi. Screen - higher dpi = more screen real estate. 216 browser safe colors- in photoshop you can check the only web safe colors box - rgb multiples of 51. Hex code doubles- the code of the color ends in 00. Gifs and pngs can only display 216 colors. Dittering- when you mix a bunch of different colored pixels to create a new color when you zoom out. Out of gamut- an unprintable photoshop color- photoshop will show you with a warning symbol at the top right. We are now in 24 bit true color- 16,888,216 colors. Codec- audio and video are compressed until they are used. Png-8 is 256 colors and 1 biit transparency (like a gif. Png-24 has millions of colors and 8 bit transparency.
