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SKPngEncoderFilterFlags Enum

Definition

Various row filters to use when encoding a PNG.

This enumeration supports a bitwise combination of its member values.

[System.Flags]
public enum SKPngEncoderFilterFlags
Inheritance
SKPngEncoderFilterFlags
Attributes

Fields

Name Value Description
NoFilters 0

Do not use any filters.

None 8

Transmit unmodified.

Sub 16

Transmit the difference between each byte and the value of the corresponding byte of the prior pixel. [Sub(x) = Raw(x) - Raw(x-bpp)]

Up 32

Transmit the difference between each byte and the value of the corresponding byte of the pixel above. [Up(x) = Raw(x) - Prior(x)]

Avg 64

Use the average of the two neighboring pixels (left and above) to predict the value of a pixel. [Average(x) = Raw(x) - floor((Raw(x-bpp)+Prior(x))/2)]

Paeth 128

Compute a simple linear function of the three neighboring pixels (left, above, upper left), then chooses as predictor the neighboring pixel closest to the computed value. [Paeth(x) = Raw(x) - PaethPredictor(Raw(x-bpp), Prior(x), Prior(x-bpp))]

AllFilters 248

Try all the filters.

Applies to

Продукт Версии
SkiaSharp 1.60.x, 1.68.x, 2.80.x, 2.88.x