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convert::color::rgb16(3pm) [debian man page]

Convert::Color::RGB16(3pm)				User Contributed Perl Documentation				Convert::Color::RGB16(3pm)

NAME
"Convert::Color::RGB16" - a color value represented as red/green/blue in 16-bit integers SYNOPSIS
Directly: use Convert::Color::RGB16; my $red = Convert::Color::RGB16->new( 65535, 0, 0 ); # Can also parse strings my $pink = Convert::Color::RGB16->new( '65535,49152,49152' ); # or $pink = Convert::Color::RGB16->new( 'ffffc000c000' ); Via Convert::Color: use Convert::Color; my $cyan = Convert::Color->new( 'rgb16:0,65535,65535' ); DESCRIPTION
Objects in this class represent a color in RGB space, as a set of three integer values in the range 0 to 65535; i.e. as 16 bits. For representations using floating point values, see Convert::Color::RGB. For representations using 8-bit integers, see Convert::Color::RGB8. CONSTRUCTOR
$color = Convert::Color::RGB16->new( $red, $green, $blue ) Returns a new object to represent the set of values given. These values should be integers between 0 and 65535. Values outside of this range will be clamped. $color = Convert::Color::RGB16->new( $string ) Parses $string for values, and construct a new object similar to the above three-argument form. The string should be in the form red,green,blue containing the three integer values in decimal notation. It can also be given in the form of a hex encoded string, such as would be returned by the "rgb16_hex" method: rrrrggggbbbb METHODS
$r = $color->red $g = $color->green $b = $color->blue Accessors for the three components of the color. ( $red, $green, $blue ) = $color->rgb16 Returns the individual red, green and blue color components of the color value in RGB16 space. $str = $color->hex Returns a string representation of the color components in the RGB16 space, in a convenient "RRRRGGGGBBBB" hex string. $mix = $color->alpha_blend( $other, [ $alpha ] ) Return a new color which is a blended combination of the two passed into it. The optional $alpha parameter defines the mix ratio between the two colors, defaulting to 0.5 if not defined. Values closer to 0 will blend more of $color, closer to 1 will blend more of $other. $mix = $color->alpha16_blend( $other, [ $alpha ] ) Similar to "alpha_blend" but works with integer arithmetic. $alpha should be an integer in the range 0 to 65535. $measure = $color->dst_rgb16( $other ) Return a measure of the distance between the two colors. This is the unweighted Euclidean distance of the three color components. Two identical colors will have a measure of 0, pure black and pure white have a distance of 1, and all others will lie somewhere inbetween. $measure = $color->dst_rgb16_cheap( $other ) Return a measure of the distance between the two colors. This is the sum of the squares of the differences of each of the color components. This is part of the value used to calculate "dst_rgb16", but since it involves no square root it will be cheaper to calculate, for use in cases where only the relative values matter, such as when picking the "best match" out of a set of colors. It ranges between 0 for identical colours and 3*(65535^2) for the distance between pure black and pure white. SEE ALSO
o Convert::Color - color space conversions AUTHOR
Paul Evans <leonerd@leonerd.org.uk> perl v5.12.3 2011-06-15 Convert::Color::RGB16(3pm)

Check Out this Related Man Page

CMAP(5)                                                         File Formats Manual                                                        CMAP(5)

NAME
cmap - format of .cmap files (color maps) DESCRIPTION
Color-map files define the mapping between eight-bit color numbers and red, green and blue intensities used for those numbers. They are read by Magic as part of system startup, and also by the :load and :save commands in color-map windows. Color-map file names usually have the form x.y.z.cmapn, where x is a class of technology files, y is a class of displays, z is a class of monitors, and n is a version number (currently 1). The version number will change in the future if the formap of color-map files ever changes. Normally, x and y correspond to the corresponding parts of a display styles file. For example, the color map file mos.7bit.std.cmap1 is used today for most nMOS and CMOS technology files using displays that support at least seven bits of color per pixel and standard-phosphor monitors. It corresponds to the display styles file mos.7bit.dstyle5. Color-map files are stored in ASCII form, with each line containing four decimal integers separated by white space. The first three inte- gers are red, green, and blue intensities, and the fourth field is a color number. For current displays the intensities must be integers between 0 and 255. The color numbers must increase from line to line, and the last line must have a color number of 255. The red, green, and blue intensities on the first line are used for all colors from 0 up to and including the color number on that line. For other lines, the intensities on that line are used for all colors starting one color above the color number on the previous line and continuing up and through the color number on the current line. For example, consider the color map below: 255 0 0 2 0 0 255 3 255 255 255 256 This color map indicates that colors 0, 1, and 2 are to be red, color 3 is to be blue, and all other colors are to be white. SEE ALSO
magic(1), dstyle(5) 4th Berkeley Distribution CMAP(5)
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