Abstract: Methods and apparatus for image convolution using a one dimensional convolution operator to perform two successive convolutions, one in one dimension and one in a second dimension. A one dimensional convolution operator is provided with convolution coefficients and image data from a data matrix, and may also be provided with offset information, and stores the result of convolution in a first dimension in a buffer. Then for convolution in the second dimension, the results of the first convolution stored in the buffer are coupled back to the convolution operator for convolution in the second dimension. In a preferred embodiment, the result of the convolution in the second dimension for each of three color components is directed to an output buffer that selectively will provide as the output, the pixel data after the two dimensional convolution or the original pixel data. Alternate forms of convolution coefficients are disclosed.