# ImageSubtract

ImageSubtract[image,x]

subtracts a constant amount x from each channel value in image.

ImageSubtract[image1,image2]

gives an image in which each pixel is obtained by subtracting the values of the corresponding pixels in image1 and image2.

ImageSubtract[image,expr1,expr2,]

subtracts all expri from image, where each expri can be either an image, a number, or a color value.

# Details

• The image returned by ImageSubtract[image,] has the same dimensions as image.
• In ImageSubtract[image,x], x can be a number normally in the range 0 to 1, a color, or a list of color channel values.
• ImageSubtract[image,x] typically gives an image with the same underlying data type as image, clipping or truncating values if necessary.
• If the image dimensions are different, ImageSubtract[image1,image2] subtracts image2 from the center of image1.
• If image1 or image2 is a single-channel image, its values are subtracted from 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 subtracted separately.
• ImageSubtract[image1,image2] gives an image with the largest type of either image1 or image2, clipping or truncating values if necessary.
• ImageSubtract[image,expr1,expr2,] folds ImageSubtract on the list of arguments.
• ImageSubtract[{image,expr1,expr2,}] is equivalent to ImageSubtract[image,expr1,expr2,].
• ImageSubtract works with Image3D objects.

# Examples

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## Basic Examples(3)

Subtract a binary mask from a color photo:

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Subtracting a constant amount from each color channel darkens an image:

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Subtracting two 3D images:

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