ImageMultiply
ImageMultiply[image,x] multiplies each channel value in image by a factor x.
ImageMultiply[image1,image2] gives an image in which each pixel is the product of the corresponding pixels in image1 and image2.
ImageMultiply[image,expr1,expr2,…] multiplies all expri with image, where each expri can be either an image, a number, or a color value.
Please visit the official Wolfram Language Reference for more details and examples on core symbols.