Name

blend()

Examples
background(loadImage("rockies.jpg"))
img = loadImage("bricks.jpg")
image(img, 0, 0)
blend(img, 0, 0, 33, 100, 67, 0, 33, 100, ADD)
background(loadImage("rockies.jpg"))
img = loadImage("bricks.jpg")
image(img, 0, 0)
blend(img, 0, 0, 33, 100, 67, 0, 33, 100, SUBTRACT)
background(loadImage("rockies.jpg"))
img = loadImage("bricks.jpg")
image(img, 0, 0)
blend(img, 0, 0, 33, 100, 67, 0, 33, 100, DARKEST)
background(loadImage("rockies.jpg"))
img = loadImage("bricks.jpg")
image(img, 0, 0)
blend(img, 0, 0, 33, 100, 67, 0, 33, 100, LIGHTEST)
Description Blends a region of pixels from one image into another (or in itself again) with full alpha channel support. There is a choice of the following modes to blend the source pixels (A) with the ones of pixels in the destination image (B):

BLEND - linear interpolation of colours: C = A*factor + B

ADD - additive blending with white clip: C = min(A*factor + B, 255)

SUBTRACT - subtractive blending with black clip: C = max(B - A*factor, 0)

DARKEST - only the darkest colour succeeds: C = min(A*factor, B)

LIGHTEST - only the lightest colour succeeds: C = max(A*factor, B)

DIFFERENCE - subtract colors from underlying image.

EXCLUSION - similar to DIFFERENCE, but less extreme.

MULTIPLY - Multiply the colors, result will always be darker.

SCREEN - Opposite multiply, uses inverse values of the colors.

OVERLAY - A mix of MULTIPLY and SCREEN. Multiplies dark values, and screens light values.

HARD_LIGHT - SCREEN when greater than 50% gray, MULTIPLY when lower.

SOFT_LIGHT - Mix of DARKEST and LIGHTEST. Works like OVERLAY, but not as harsh.

DODGE - Lightens light tones and increases contrast, ignores darks. Called "Color Dodge" in Illustrator and Photoshop.

BURN - Darker areas are applied, increasing contrast, ignores lights. Called "Color Burn" in Illustrator and Photoshop.

All modes use the alpha information (highest byte) of source image pixels as the blending factor. If the source and destination regions are different sizes, the image will be automatically resized to match the destination size. If the srcImg parameter is not used, the display window is used as the source image.

As of release 0149, this function ignores imageMode().
Syntax
blend(sx, sy, sw, sh, dx, dy, dw, dh, mode)
blend(src, sx, sy, sw, sh, dx, dy, dw, dh, mode)
Parameters
srcPImage: an image variable referring to the source image
sxint: X coordinate of the source's upper left corner
syint: Y coordinate of the source's upper left corner
swint: source image width
shint: source image height
dxint: X coordinate of the destinations's upper left corner
dyint: Y coordinate of the destinations's upper left corner
dwint: destination image width
dhint: destination image height
modeint: Either BLEND, ADD, SUBTRACT, LIGHTEST, DARKEST, DIFFERENCE, EXCLUSION, MULTIPLY, SCREEN, OVERLAY, HARD_LIGHT, SOFT_LIGHT, DODGE, BURN
Related alpha()
Updated on Tue Jul 11 06:52:23 2017.
Creative Commons License