Enum ContrastInvert

Namespace

Egami.Operations

Assembly

Egami.dll

How HighContrast(bool, ContrastInvert, float) inverts, as Skia's high-contrast filter does.

public enum ContrastInvert

Fields

Brightness = 1

Each of red, green and blue becomes 1 − value, which also turns hues around.

Lightness = 2

HSL lightness becomes 1 − lightness and hue and saturation stay, so dark text on light becomes light on dark in the same colors.

None = 0

No inversion. The default.

Examples

// A two-color poster, then a check of how it reads to someone with deuteranopia.
raster.Apply(o => o.Duotone(Rgba8.FromHex("#1b2a49"), Rgba8.FromHex("#f2c14e")).Posterize(4, DitherMode.Ordered), Ct);
using Raster<Rgba8> preview = raster.Derive(o => o.SimulateColorBlindness(ColorVisionDeficiency.Deuteranopia), Ct);

// High contrast for low vision: gray, lightness inverted so dark becomes light, and more contrast.
using Raster<Rgba8> readable = raster.Derive(o => o.HighContrast(grayscale: true, ContrastInvert.Lightness, contrast: 0.3f), Ct);