Documentation
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Overview ¶
Package srgb provides support for the sRGB colour space.
Index ¶
- Variables
- func EncodeColor(c color.Color) color.RGBA64
- func EncodeImage(dst draw.Image, src image.Image, parallelism int)
- func From8Bit(v uint8) float32
- func From16Bit(v uint16) float32
- func LineariseColor(c color.Color) color.RGBA64
- func LineariseImage(dst draw.Image, src image.Image, parallelism int)
- func To8Bit(v float32) uint8
- func To16Bit(v float32) uint16
- type Color
- func ColorFromEncodedColor(c color.Color) (col Color, alpha float32)
- func ColorFromLinear(r, g, b float32) Color
- func ColorFromLinearColor(c color.Color) (col Color, alpha float32)
- func ColorFromNRGBA(c color.NRGBA) (col Color, alpha float32)
- func ColorFromRGBA(c color.RGBA) (col Color, alpha float32)
- func ColorFromXYZ(c ciexyz.Color) Color
Constants ¶
This section is empty.
Variables ¶
var PrimaryBlue = ciexyy.Color{X: 0.15, Y: 0.06, YY: 1}
var PrimaryGreen = ciexyy.Color{X: 0.3, Y: 0.6, YY: 1}
var PrimaryRed = ciexyy.Color{X: 0.64, Y: 0.33, YY: 1}
var StandardWhitePoint = ciexyy.D65
Functions ¶
func EncodeColor ¶
EncodeColor converts a linear colour value to an sRGB encoded one.
func EncodeImage ¶
EncodeImage converts an image with linear colour into an sRGB encoded one.
src is the linearised image to be encoded.
dst is the image to write the result to, beginning at its origin.
src and dst may be the same image.
parallelism specifies the degree of parallel processing; a value of 4 indicates that processing will be spread across four threads.
func From8Bit ¶
From8Bit converts an 8-bit sRGB encoded value to a normalised linear value between 0.0 and 1.0.
This implementation uses a fast look-up table without sacrificing accuracy.
func From16Bit ¶
From16Bit converts a 16-bit sRGB encoded value to a normalised linear value between 0.0 and 1.0.
This implementation uses a fast look-up table without sacrificing accuracy.
func LineariseColor ¶
LineariseColor converts an sRGB encoded colour into a linear one.
func LineariseImage ¶
LineariseImage converts an image with sRGB encoded colour to linear colour.
src is the encoded image to be linearised.
dst is the image to write the result to, beginning at its origin.
src and dst may be the same image.
parallelism specifies the degree of parallel processing; a value of 4 indicates that processing will be spread across four threads.
Types ¶
type Color ¶
Color represents a linear normalised colour in sRGB space.
func ColorFromEncodedColor ¶
ColorFromEncodedColor creates a Color instance from an sRGB encoded color.Color value. The alpha value is returned as a normalised value between 0.0–1.0.
func ColorFromLinear ¶
ColorFromLinear creates a Color instance from a linear normalised RGB triplet.
func ColorFromLinearColor ¶
ColorFromLinearColor creates a Color instance from a linear color.Color value. The alpha value is returned as a normalised value between 0.0–1.0.
func ColorFromNRGBA ¶
ColorFromNRGBA creates a Color instance by interpreting an 8-bit NRGBA colour as sRGB encoded. The alpha value is returned as a normalised value between 0.0–1.0.
func ColorFromRGBA ¶
ColorFromRGBA creates a Color instance by interpreting an 8-bit RGBA colour as sRGB encoded. The alpha value is returned as a normalised value between 0.0–1.0.
func ColorFromXYZ ¶
ColorFromXYZ creates an sRGB Color instance from a CIE XYZ colour.
func (Color) ToNRGBA ¶
ToNRGBA returns an encoded 8-bit NRGBA representation of this colour suitable for use with instances of image.NRGBA.
alpha is the normalised alpha value and will be clipped to 0.0–1.0.
func (Color) ToRGBA ¶
ToRGBA returns an encoded 8-bit RGBA representation of this colour suitable for use with instances of image.RGBA.
alpha is the normalised alpha value and will be clipped to 0.0–1.0.
Source Files