THE COLORS OF LIGHT RED, GREEN and BLUE

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Presentation transcript:

THE COLORS OF LIGHT RED, GREEN and BLUE Don’t think of red, green and blue as primary colors – to a computer, they represent light. Placing one light (color) on top of another creates white, not black – black is the absence of light. Red, green and blue are ADDITIVE COLORS.

COLOR CODING There are five color options from which to choose: Background Font Links Active Links Visited Links All are created by using a combination of six numbers or letters: 000000 (black) up to FFFFFF (white). There are 216 browser-safe color combinations.

CODING WITH HTML CODE Background <BGCOLOR=“#FFFFFF”> Font <TEXT=“#000000”> Links <LINK=“#6666FF”> Active Links <ALINK=“#FF0000”> Visited Links <VLINK=“#993399”> http://htmlgoodies.earthweb.com/tutors/non_dithering_colors.html

BIT (COLOR) DEPTH Bit depth refers to how many colors can reside in an image. 8 bit = 256 colors 16 bit = 64,000 colors 24 bit = 16.7 million 32 bit = Wow! The amount of color you can view depends upon the size of your browser. Less powerful browsers compensate for large graphics by DITHERING (fooling the eye).

GIF or JPG? There are two basic photo formats for the Web: GIF (Graphic Interchange Format) Uses lossless compression JPG (Joint Photographic Experts Group) Uses lossy compression They are NOT interchangeable. GIF is for line art (cartoons, drawings, etc.) Transparent images Animation JPG is for photographs