images

Documentation

Index

• Variables
• func AddColorToPalette(c color.Color, p color.Palette) color.Palette
• func ColorToHexString(c color.Color) string
• func HexStringToColor(s string) (color.Color, error)
• func ReplaceColorInPalette(c color.Color, p color.Palette)

Variables

var AnchorPositions = map[string]gift.Anchor{
	strings.ToLower("Center"):      gift.CenterAnchor,
	strings.ToLower("TopLeft"):     gift.TopLeftAnchor,
	strings.ToLower("Top"):         gift.TopAnchor,
	strings.ToLower("TopRight"):    gift.TopRightAnchor,
	strings.ToLower("Left"):        gift.LeftAnchor,
	strings.ToLower("Right"):       gift.RightAnchor,
	strings.ToLower("BottomLeft"):  gift.BottomLeftAnchor,
	strings.ToLower("Bottom"):      gift.BottomAnchor,
	strings.ToLower("BottomRight"): gift.BottomRightAnchor,
}

var Hints = map[string]webpoptions.EncodingPreset{
	"picture": webpoptions.EncodingPresetPicture,
	"photo":   webpoptions.EncodingPresetPhoto,
	"drawing": webpoptions.EncodingPresetDrawing,
	"icon":    webpoptions.EncodingPresetIcon,
	"text":    webpoptions.EncodingPresetText,
}

These encoding hints are currently only relevant for Webp.

var ImageFilters = map[string]gift.Resampling{
	strings.ToLower("NearestNeighbor"):   gift.NearestNeighborResampling,
	strings.ToLower("Box"):               gift.BoxResampling,
	strings.ToLower("Linear"):            gift.LinearResampling,
	strings.ToLower("Hermite"):           hermiteResampling,
	strings.ToLower("MitchellNetravali"): mitchellNetravaliResampling,
	strings.ToLower("CatmullRom"):        catmullRomResampling,
	strings.ToLower("BSpline"):           bSplineResampling,
	strings.ToLower("Gaussian"):          gaussianResampling,
	strings.ToLower("Lanczos"):           gift.LanczosResampling,
	strings.ToLower("Hann"):              hannResampling,
	strings.ToLower("Hamming"):           hammingResampling,
	strings.ToLower("Blackman"):          blackmanResampling,
	strings.ToLower("Bartlett"):          bartlettResampling,
	strings.ToLower("Welch"):             welchResampling,
	strings.ToLower("Cosine"):            cosineResampling,
}

Functions

func AddColorToPalette

func AddColorToPalette(c color.Color, p color.Palette) color.Palette

AddColorToPalette adds c as the first color in p if not already there. Note that it does no additional checks, so callers must make sure that the palette is valid for the relevant format.

func ColorToHexString

func ColorToHexString(c color.Color) string

ColorToHexString converts a color to a hex string.

func HexStringToColor

func HexStringToColor(s string) (color.Color, error)

func ReplaceColorInPalette

func ReplaceColorInPalette(c color.Color, p color.Palette)

ReplaceColorInPalette will replace the color in palette p closest to c in Euclidean R,G,B,A space with c.