Mask Apply

Mask

Applies a mask as the alpha channel of an image. This is the standard way to cut out, reveal, or restrict image areas.

Mask Apply takes an image and a mask, and combines them. In Cut Out mode, the mask becomes the image’s alpha: white areas remain visible, black areas become transparent. Multiply Alpha multiplies the existing alpha by the mask. Intersect keeps only the overlap.

This is how you convert a mask selection into an actual transparency cutout.

Parameters

Pins

↳ImageImage

InputRequired

↳MaskMask

InputRequired

↦ImageImage

Output

Mask

ModeChoice

Default: Cut Out

How the mask is combined with the image's alpha channel

• Cut OutReplace the image's alpha with the mask: white areas visible, black areas transparent.
• Multiply AlphaMultiply the existing alpha by the mask, preserving existing transparency while adding the mask effect.
• IntersectKeep only pixels where both the image and mask are opaque.

Mask FromChoice

Default: Luminance

Color image connected to the mask input

How the connected color image is read as a mask. Luminance: the image's brightness. Alpha: the image's transparency. Red / Green / Blue: a single channel

• LuminanceRead the image's brightness as the mask. The default.
• AlphaRead the image's transparency as the mask.
• RedUse the red channel as the mask.
• GreenUse the green channel as the mask.
• BlueUse the blue channel as the mask.

Usage Tips

• Use Cut Out to remove backgrounds (white mask = visible, black mask = transparent).
• Multiply Alpha preserves the image’s existing alpha while adding the mask on top.
• Wire multiple Mask Apply nodes in series to combine several mask effects.
• Image and mask must have identical dimensions or the node will error. Resize one input to match if needed.
• Use Intersect to keep the tighter of two alpha boundaries, useful when both image and mask carry meaningful alpha.

Related Nodes

• Mask From Image
• Mask Refine
• Composite