Enum MaskChannel

Namespace

Egami.Operations

Assembly

Egami.dll

Which values of a raster a Mask reads as coverage.

public enum MaskChannel

Fields

Alpha = 2

The alpha: opaque is full coverage. A raster without alpha is opaque everywhere.

Auto = 0

The value of a one-channel raster (gray, or Alpha8's alpha); otherwise the alpha of a raster with alpha; otherwise the luminance.

Blue = 5

The blue channel; a gray raster's gray value.

Green = 4

The green channel; a gray raster's gray value.

Luminance = 1

The Rec. 709 luminance of the stored values: 0.2126 R + 0.7152 G + 0.0722 B. White is full coverage.

Red = 3

The red channel; a gray raster's gray value.

Examples

// Edit only the sky: a gray mask, white where the edit applies fully, black where it does not, soft in between.
photo.Apply(ops => ops
    .Within(new Mask(sky), o => o.Saturation(1.3f).Contrast(1.1f))

    // Or take coverage from a logo's alpha, placed on the photo, and invert the area under it.
    .Within(new Mask(logo, new Point(20, 20), MaskChannel.Alpha), o => o.Invert()), Ct);