ImageMask.Subtract

Subtract(ImageMask)

Gets the subtraction of the provided mask from current.

public ImageBitMask Subtract(ImageMask mask)

Parameter	Type	Description
mask	ImageMask	Provided mask

Return Value

New ImageBitMask.

Examples

The example shows how to select a complicated area of an image using Magic Wand tool and the ability to interact with masks (invert, union, substract).

[C#]

var imageFilePath = "input.png"; 
using (RasterImage image = (RasterImage)Image.Load(inputFilePath))
{
    // Create a new mask using magic wand tool based on tone and color of pixel (845, 128)
    MagicWandTool.Select(image, new MagicWandSettings(845, 128))
        // Union the existing mask with the specified one created by magic wand tool
        .Union(new MagicWandSettings(416, 387))
        // Invert the existing mask
        .Invert()
        // Subtract the specified mask created by magic wand tool with specified threshold from the existing one 
        .Subtract(new MagicWandSettings(1482, 346) { Threshold = 69 })
        // Subtract four specified rectangle masks from the existing mask one by one
        .Subtract(new RectangleMask(0, 0, 800, 150))
        .Subtract(new RectangleMask(0, 380, 600, 220))
        .Subtract(new RectangleMask(930, 520, 110, 40))
        .Subtract(new RectangleMask(1370, 400, 120, 200))
        // Feather mask with specified settings
        .GetFeathered(new FeatheringSettings() { Size = 3 })
        // Apply mask to the image
        .Apply();
        
    // Save image
    image.Save(outputFilePath);
}

See Also

• class ImageBitMask
• class ImageMask
• namespace Aspose.Imaging.MagicWand.ImageMasks
• assembly Aspose.Imaging

---

Subtract(MagicWandSettings)

Gets the result of magic wand selection applied to the source of the current mask subtracted from the mask.

public ImageBitMask Subtract(MagicWandSettings settings)

Parameter	Type	Description
settings	MagicWandSettings	Magic wand settings.

Return Value

New ImageBitMask.

Exceptions

exception	condition
ArgumentNullException	Thrown when the source image is not defined in mask.

See Also

• class ImageBitMask
• class MagicWandSettings
• class ImageMask
• namespace Aspose.Imaging.MagicWand.ImageMasks
• assembly Aspose.Imaging

---

Subtract(RasterImage, MagicWandSettings)

Gets the result of magic wand selection applied to the provided image subtracted from the current mask.

public ImageBitMask Subtract(RasterImage image, MagicWandSettings settings)

Parameter	Type	Description
image	RasterImage	Image for magic wand.
settings	MagicWandSettings	Magic wand settings.

Return Value

New ImageBitMask.

See Also

• class ImageBitMask
• class RasterImage
• class MagicWandSettings
• class ImageMask
• namespace Aspose.Imaging.MagicWand.ImageMasks
• assembly Aspose.Imaging