SKImageFilter.CreateAlphaThreshold Method
Definition
Important
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Overloads
| CreateAlphaThreshold(SKRectI, Single, Single, SKImageFilter) |
Creates an image filter that samples a region. |
| CreateAlphaThreshold(SKRegion, Single, Single, SKImageFilter) |
Creates an image filter that samples a region. |
CreateAlphaThreshold(SKRectI, Single, Single, SKImageFilter)
Creates an image filter that samples a region.
public static SkiaSharp.SKImageFilter CreateAlphaThreshold (SkiaSharp.SKRectI region, float innerThreshold, float outerThreshold, SkiaSharp.SKImageFilter input = default);Parameters
- region
- SKRectI
The region to sample.
- innerThreshold
- Single
The minimum alpha for pixels within the region.
- outerThreshold
- Single
The maximum alpha for pixels outside the region.
- input
- SKImageFilter
The input filter to use.
Returns
Returns the new SKImageFilter, or null on error.
Remarks
If the sample is inside the region the alpha of the image is boosted up to a threshold value. If it is outside the region then the alpha is decreased to the threshold value. The (0, 0) point of the region corresponds to the upper left corner of the source image.
Applies to
CreateAlphaThreshold(SKRegion, Single, Single, SKImageFilter)
Creates an image filter that samples a region.
public static SkiaSharp.SKImageFilter CreateAlphaThreshold (SkiaSharp.SKRegion region, float innerThreshold, float outerThreshold, SkiaSharp.SKImageFilter input = default);Parameters
- region
- SKRegion
The region to sample.
- innerThreshold
- Single
The minimum alpha for pixels within the region.
- outerThreshold
- Single
The maximum alpha for pixels outside the region.
- input
- SKImageFilter
The input filter to use.
Returns
Returns the new SKImageFilter, or null on error.
Remarks
If the sample is inside the region the alpha of the image is boosted up to a threshold value. If it is outside the region then the alpha is decreased to the threshold value. The (0, 0) point of the region corresponds to the upper left corner of the source image.
