Abstract: A method of mapping an input image split into input triangles including texels onto an output image also split into corresponding output triangles including pixels. Said method comprising the steps of: determining an inverse affine transform (BT) for transforming an intermediate rectangle triangle (T0) into an input triangle (T1); determining a direct affine transform (FT) for transforming the intermediate rectangle triangle (T0) into an output triangle (T2); applying the inverse affine transform to intermediate points of the intermediate rectangle triangle (T0) so as to determine intermediate intensity values corresponding to said intermediate points on the basis of input intensity values of texels; and applying the direct affine transform to the intermediate points so as to determine output intensity values of pixels on the basis of the intermediate intensity values.