imadd (Image Processing Toolbox)

Add two images, or add a constant to an image

Syntax

```
Z = imadd(X,Y)
```

Description

Z = imadd(X,Y) adds each element in array X with the corresponding element in array Y and returns the sum in the corresponding element of the output array Z. X and Y are real, nonsparse numeric arrays with the same size and class, or Y is a scalar double. The array returned, Z, has the same size and class, or Y is a scalar double. Z has the same size and class as X.

If X and Y are integer arrays, elements in the output that exceed the range of the integer type are truncated, and fractional values are rounded.

If X and Y are double arrays, you can use the expression X+Y instead of this function.

Examples

Add two uint8 arrays. Note the truncation that occurs when the values exceed 255.

X = uint8([ 255 0 75; 44 225 100]);
Y = uint8([ 50 50 50; 50 50 50 ]);
Z = imadd(X,Y)
Z =

   255    50   125
    94   255   150

Add two images together and specify an output class.

I = imread('rice.tif');
J = imread('cameraman.tif');
K = imadd(I,J,'uint16');
imshow(K,[])

Add a constant to an image.

I = imread('rice.tif');
J = imadd(I,50);
subplot(1,2,1), imshow(I) 
subplot(1,2,2), imshow(J)

imabsdiff imadjust