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A number of ImageMagick options and methods accept a color name or a numerical RGB, RGBA, CMYK, or CMYKA specification. For example,

  convert -bordercolor blue -border 10 image.jpg image.png

The list of recognized color names, for example, aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, purple, red, silver, teal, white, yellow and others are shown in the table below.

The RGB and CMYK color models are used in numerical color specifications. These examples all specify the same RGB color:

  #f00               /* #rgb */
  #ff0000            /* #rrggbb */
  #ffff00000000      /* #rrrrggggbbbb */
  rgb(255,0,0)       /* integer range 0 - 255 */
  rgb(100%, 0%, 0%)  /* float range 0.0% - 100.0% */

The format of an RGB value in hexadecimal notation is a pound sign (i.e. #) immediately followed by either three, six, or nine hexadecimal characters. The three-digit RGB notation (#rgb) is converted into six-digit form (#rrggbb) by replicating digits, not by adding zeros. For example, #fb0 expands to #ffbb00. This ensures that white (#ffffff) can be specified with the short notation (#fff) and removes any dependencies on the color depth. Add additional hex digits to specify the level of transparency (#rrggbbaa).

The format of an RGB value in the functional notation is rgb( followed by a comma-separated list of three numerical values (either three integer values or three percentage values) followed by right parenthesis. The integer value 255 corresponds to 100%, and to F or FF in the hexadecimal notation: rgb(255,255,255) = rgb(100%,100%,100%) = #FFF. Whitespace characters are allowed around the numerical values. Use RGBA and a fourth numerical value to specify the level of transparency.

The format of an CMYK value in the functional notation is cmyk( followed by a comma-separated list of four numerical values (either four integer values or four percentage values) followed by right parenthesis. The integer value 255 corresponds to 100%: cmyk(255,255,255,255) = cmyk(100%,100%,100%,100%). Whitespace characters are allowed around the numerical values. Use CMYKA and a fifth numerical value to specify the level of transparency.