8-bit color 15/16 bit: Highcolour 24/32 bit: Truecolour Web-safe color Color depth is a computer graphics term describing the number of bits used to represent the color of a single pixel in a bitmapped image or video frame buffer. ... 8-bit colour graphics is a method of storing image information in a computers memory or in an image file, such that each pixel is represented by one 8-bit byte. ... Highcolour (or Hicolour, Highcolor, Hicolor, Thousands on a Macintosh) graphics is a method of storing image information in a computers memory such that each pixel is represented by two bytes. ... Truecolour (or Truecolor, Millions on a Macintosh) graphics is a method of storing image information in a computers memory such that each pixel is represented by three or more bytes. ... Authors of web pages have a variety of options available for specifying colors for elements of web documents. ...
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RGB color model Palette Jump to: navigation, search The RGB color model utilizes the additive model in which red, green, and blue light are combined in various ways to create other colors. ... An artists palette A palette is: A thin board that a painter holds and mixes colour pigments on. ...
Truecolor (also spelled Truecolour; called Millions on a Macintosh) graphics is a method of storing image information in a computer's memory such that each pixel is represented by three or more bytes. Jump to: navigation, search Apple iMac G5 desktop computer with Apple Remote attached to the side, and FrontRow on the display. ... A pixel (a portmanteau of picture element) is one of the many tiny dots that make up the representation of a picture in a computers memory. ... A byte is commonly used as a unit of storage measurement in computers, regardless of the type of data being stored. ...
Generally one byte is used for each channel with the fourth byte (if present) being used either as an alpha channel data or simply ignored. Byte order is usually either RGB or BGR. However systems do exist with more than 8 bits per channel and these are often also referred to as truecolor (for example a 48-bit truecolor scanner). In computer graphics, alpha compositing is often useful to render image elements in separate passes, and then combine the resulting multiple 2D images into a single, final image in a process called compositing. ...
One byte per channel gives 256 (28) intensites for each of the channels which gives 16,777,216 colors for each pixel (often approximated as 16 million despite the fact its closer to 17 million). The reason this is called truecolour is that this is around the number of colours the human eye is able to detect.
Whilst an alpha channel is meaningless in a display buffer, 32 bit truecolour has become popular on the computer desktop because it simplifies drawing of translucent images on the screen (and is often a requirement for hardware acceleration of such drawing) allowing desktop environments to more easilly provide effects such as translucent windows, fading menus, and shadows.
All truecolorpixel values are passed to the drawing functions as regular ints, just as in eight bit modes.
Converting between different truecolor formats is slightly slower, and reducing truecolor images to a 256 color destination is very slow (it can be sped up significantly if you set up the global rgb_map table before doing the conversion).
So if you are in a truecolor mode and want to draw a line using color #3 from the current palette, pass palette_color[3] as the color parameter to the line() function.
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