image.color

fn cmyk_to_rgb(c u8, m u8, y u8, k u8) (u8, u8, u8)

cmyk_to_rgb converts a CMYK quadruple to an RGB triple.

fn constant_model(c Color) Model

constant_model returns a model that converts every input color to c.

fn rgb_to_cmyk(r u8, g u8, b u8) (u8, u8, u8, u8)

rgb_to_cmyk converts an RGB triple to a CMYK quadruple.

fn rgb_to_ycbcr(r u8, g u8, b u8) (u8, u8, u8)

rgb_to_ycbcr converts an RGB triple to a JFIF Y'CbCr triple.

fn to_alpha(c Color) Alpha

to_alpha converts c to Alpha.

fn to_alpha16(c Color) Alpha16

to_alpha16 converts c to Alpha16.

fn to_cmyk(c Color) CMYK

to_cmyk converts c to CMYK.

fn to_gray(c Color) Gray

to_gray converts c to Gray.

fn to_gray16(c Color) Gray16

to_gray16 converts c to Gray16.

fn to_nrgba(c Color) NRGBA

to_nrgba converts c to NRGBA.

fn to_nrgba64(c Color) NRGBA64

to_nrgba64 converts c to NRGBA64.

fn to_nycbcra(c Color) NYCbCrA

to_nycbcra converts c to NYCbCrA.

fn to_rgba(c Color) RGBA

to_rgba converts c to RGBA.

fn to_rgba64(c Color) RGBA64

to_rgba64 converts c to RGBA64.

fn to_ycbcr(c Color) YCbCr

to_ycbcr converts c to YCbCr.

fn ycbcr_to_rgb(y u8, cb u8, cr u8) (u8, u8, u8)

ycbcr_to_rgb converts a JFIF Y'CbCr triple to an RGB triple.

fn ModelKind.from[W](input W) !ModelKind

type Color = Alpha
	| Alpha16
	| CMYK
	| Gray
	| Gray16
	| NRGBA
	| NRGBA64
	| NYCbCrA
	| RGBA
	| RGBA64
	| YCbCr

Color is the set of color types provided by this module.

fn (c Color) rgba() (u32, u32, u32, u32)

rgba returns the alpha-premultiplied red, green, blue, and alpha channels as 16-bit values stored in u32s.

type Model = ConstantModel | ModelKind | Palette

Model converts colors into a color model.

fn (m Model) convert(c Color) !Color

convert converts c into the receiver's color model.

enum ModelKind {
	rgba
	rgba64
	nrgba
	nrgba64
	alpha
	alpha16
	gray
	gray16
	ycbcr
	nycbcra
	cmyk
}

ModelKind identifies one of the standard color conversion models.

fn (m ModelKind) convert(c Color) Color

convert converts c into the receiver's standard color model.

struct Alpha {
pub mut:
	a u8
}

Alpha represents an 8-bit alpha color.

fn (c Alpha) rgba() (u32, u32, u32, u32)

rgba returns the alpha channel copied into each alpha-premultiplied channel.

struct Alpha16 {
pub mut:
	a u16
}

Alpha16 represents a 16-bit alpha color.

fn (c Alpha16) rgba() (u32, u32, u32, u32)

rgba returns the alpha channel copied into each alpha-premultiplied channel.

struct CMYK {
pub mut:
	c u8
	m u8
	y u8
	k u8
}

CMYK represents an opaque CMYK color.

fn (c CMYK) rgba() (u32, u32, u32, u32)

rgba converts c to alpha-premultiplied 16-bit RGBA channels.

struct ConstantModel {
pub mut:
	c Color
}

ConstantModel converts every input color to c.

fn (m ConstantModel) convert(c Color) Color

convert converts c into the receiver's constant color.

struct Gray {
pub mut:
	y u8
}

Gray represents an 8-bit grayscale color.

fn (c Gray) rgba() (u32, u32, u32, u32)

rgba returns the grayscale channel as opaque red, green, and blue channels.

struct Gray16 {
pub mut:
	y u16
}

Gray16 represents a 16-bit grayscale color.

fn (c Gray16) rgba() (u32, u32, u32, u32)

rgba returns the grayscale channel as opaque red, green, and blue channels.

struct NRGBA {
pub mut:
	r u8
	g u8
	b u8
	a u8
}

NRGBA represents a non-alpha-premultiplied 32-bit color.

fn (c NRGBA) rgba() (u32, u32, u32, u32)

rgba returns the alpha-premultiplied red, green, blue, and alpha channels as 16-bit values stored in u32s.

struct NRGBA64 {
pub mut:
	r u16
	g u16
	b u16
	a u16
}

NRGBA64 represents a non-alpha-premultiplied 64-bit color.

fn (c NRGBA64) rgba() (u32, u32, u32, u32)

rgba returns the alpha-premultiplied red, green, blue, and alpha channels as 16-bit values stored in u32s.

struct NYCbCrA {
pub mut:
	ycbcr YCbCr
	a     u8
}

NYCbCrA represents a non-alpha-premultiplied JFIF Y'CbCr-with-alpha color.

fn (c NYCbCrA) rgba() (u32, u32, u32, u32)

rgba converts c to alpha-premultiplied 16-bit RGBA channels.

struct Palette {
pub mut:
	colors []Color
}

Palette is an ordered list of colors.

fn (p Palette) convert(c Color) !Color

convert returns the palette color closest to c.

fn (p Palette) index(c Color) int

index returns the index of the palette color closest to c in RGBA space.

struct RGBA {
pub mut:
	r u8
	g u8
	b u8
	a u8
}

RGBA represents a 32-bit alpha-premultiplied color.

fn (c RGBA) rgba() (u32, u32, u32, u32)

rgba returns the alpha-premultiplied red, green, blue, and alpha channels as 16-bit values stored in u32s.

struct RGBA64 {
pub mut:
	r u16
	g u16
	b u16
	a u16
}

RGBA64 represents a 64-bit alpha-premultiplied color.

fn (c RGBA64) rgba() (u32, u32, u32, u32)

rgba returns the alpha-premultiplied red, green, blue, and alpha channels as 16-bit values stored in u32s.

struct YCbCr {
pub mut:
	y  u8
	cb u8
	cr u8
}

YCbCr represents an opaque JFIF Y'CbCr color.

fn (c YCbCr) rgba() (u32, u32, u32, u32)

rgba converts c to alpha-premultiplied 16-bit RGBA channels.