This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.

 ImageAdd[image, x] adds an amount x to each channel value in image. ImageAdd[image1, image2]gives an image in which each pixel is the sum of the corresponding pixels in image1 and image2.
• The image returned by ImageAdd[image, ...] has the same dimensions as image.
• If the image dimensions are different, ImageAdd[image1, image2] adds image2 at the center of image1.
• If image1 or image2 is a single-channel image, its values are added to the values in each channel of the other image in ImageAdd[image1, image2].
• If image1 and image2 are both multichannel images, the values in each channel are added separately.
• In ImageAdd[image, x], the number x is normally in the range 0 to 1.
• ImageAdd[image, x] gives an image with the same underlying data type as image, clipping or truncating values if necessary.
• ImageAdd[image1, image2] gives an image with the largest type of either image1 and image2, clipping or truncating values if necessary.
• For binary images, ImageAdd effectively finds the logical OR of pixel values.
Brighten a color image by adding a constant amount to all channels:
Logical OR of two binary images: