Arithmetic operators

Files
file	add.c
	pixelwise addition of two images
file	addconst.c
	adds a constant value to an image
file	area.c
	return the number of non-null pixels of an image
file	argmax.c
	return the coordinates of a pixel having the maximal value
file	argmin.c
	return the coordinates of a pixel having the minimal value
file	average.c
	pixelwise (weighted) average of two images
file	complex_imaginary.c
	pixelwise imaginary part of complex
file	complex_modulus.c
	pixelwise modulus of complex
file	complex_real.c
	pixelwise real part of complex
file	correctbias.c
	correction of a luminosity bias expressed by a linear function
file	diffimages.c
	pixelwise absolute value difference of 2 images
file	div.c
	pixelwise division of two images
file	dup.c
	duplicates an image
file	equal.c
	equality test
file	exp.c
	pixelwise exponentiation
file	gammacor.c
	performs gamma correction on image
file	genfield.c
	generates a null vector field of given size
file	genimage.c
	generates a monocolor image of given size
file	inf.c
	pixelwise inf predicate
file	inverse.c
	computes the pixelwise inverse of an image
file	isnull.c
	nullity test
file	log.c
	pixelwise logarithm
file	mask.c
	applies a binary mask to an image
file	max.c
	maximum of 2 images
file	max1.c
	return the maximum of the pixel values of an image
file	min.c
	minimum of 2 images
file	min1.c
	return the minimum of the pixel values of an image
file	mult.c
	pixelwise multiplication of two images
file	normalize.c
	normalization of grayscale values
file	pow.c
	raises the value of each pixel to the pth power
file	scale.c
	product of an image by a scalar
file	selndg.c
	selects pixels with values between two thresholds
file	seuil.c
	simple threshold
file	seuil2.c
	double threshold
file	seuilauto.c
	automatic threshold
file	standarddeviation1.c
	return the standard deviation of the pixel values of an image
file	sub.c
	substracts an image from another one
file	sup.c
	pixelwise sup predicate
file	threshold.c
	simple threshold
file	volume.c
	return the sum of the pixel values of an image
file	xor.c
	pixelwise xor of two images