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source-over (default value for ctx.globalCompositeOperation )Draws new shapes on top of the existing canvas content

source-in The new shape is drawn only where both the new shape and the destination canvas overlap. Everything else is made transparent.

source-out The new shape is drawn where it doesn't overlap the existing canvas content.

source-atop The new shape is only drawn where it overlaps the existing canvas content.

destination-over New shapes are drawn behind the existing canvas content.

destination-in The existing canvas content is kept where both the new shape and existing canvas content overlap. Everything else is made transparent.

destination-out The existing content is kept where it doesn't overlap the new shape.

destination-atop The existing canvas is only kept where it overlaps the new shape. The new shape is drawn behind the canvas content.

lighter Where both shapes overlap the color is determined by adding color values.

copy Only the new shape is shown.

xor Shapes are made transparent where both overlap and drawn normal everywhere else.

multiply The pixels are of the top layer are multiplied with the corresponding pixel of the bottom layer. A darker picture is the result.

screen The pixels are inverted, multiplied, and inverted again. A lighter picture is the result (opposite of multiply)

overlay A combination of multiply and screen. Dark parts on the base layer become darker, and light parts become lighter.

darken Retains the darkest pixels of both layers.

lighten Retains the lightest pixels of both layers.

color-dodge Divides the bottom layer by the inverted top layer.

color-burn Divides the inverted bottom layer by the top layer, and then inverts the result.

hard-light A combination of multiply and screen like overlay, but with top and bottom layer swapped.

soft-light A softer version of hard-light. Pure black or white does not result in pure black or white.

difference Subtracts the bottom layer from the top layer or the other way round to always get a positive value.

exclusion Like difference, but with lower contrast.

hue Preserves the luma and chroma of the bottom layer, while adopting the hue of the top layer.

saturation Preserves the luma and hue of the bottom layer, while adopting the chroma of the top layer.

color Preserves the luma of the bottom layer, while adopting the hue and chroma of the top layer.

luminosity Preserves the hue and chroma of the bottom layer, while adopting the luma of the top layer.

❎ ctx.globalCompositeOperation = ""

globalCompositeOperation tests