A method, comprising: receiving (i) depth image data representing a plurality of depth images (134 - 134) of an object, each of the plurality of depth images (134 - 134) being a depth image of the object captured from a respective viewpoint (320, 330, 340), and (ii) color image data representing a plurality of color images (144 - 144), each of the plurality of color images (144 - 144) (a) being a color image of the object captured from a respective viewpoint (320, 330, 340) and (b) having a plurality of macroblocks, each of the macroblocks corresponding to a respective region of the color image; for a color image from the plurality of color images (144 - 144): identifying a depth image of the plurality of depth images (134 - 134) associated with the color image; characterized in that the method further comprises: for each pixel of the depth image: determining a position (314; 364) of a point on a surface of the object based on a depth value of the depth image associated with that pixel; generating a blend weight corresponding to the determined position (314; 364), the blend weight being based on a surface normal (312; 360) of the depth image at the position (314; 364) and the viewpoints (320, 330, 340) from which the plurality of color images (144 - 144) were captured; generating a value of a delta quantization parameter (Δ QP) based on the blend weight; and determining a macroblock of the plurality of macroblocks of the color image corresponding to the position (314; 364) and associating the determined macroblock with the value of the delta quantization parameter (Δ QP) for the pixel; and performing a compression operation on the color image, a compression ratio of each of the plurality of macroblocks of the color image being based on the value of the delta quantization parameter (Δ QP) with which the macroblock is associated. receiving (i) depth image data representing a plurality of depth images (134 - 134) of an object, each of the plurality of depth images (134 - 134) being a depth image of the object captured from a respective viewpoint (320, 330, 340), and (ii) color image data representing a plurality of color images (144 - 144), each of the plurality of color images (144 - 144) (a) being a color image of the object captured from a respective viewpoint (320, 330, 340) and (b) having a plurality of macroblocks, each of the macroblocks corresponding to a respective region of the color image; for a color image from the plurality of color images (144 - 144): identifying a depth image of the plurality of depth images (134 - 134) associated with the color image; identifying a depth image of the plurality of depth images (134 - 134) associated with the color image; for each pixel of the depth image: determining a position (314; 364) of a point on a surface of the object based on a depth value of the depth image associated with that pixel; generating a blend weight corresponding to the determined position (314; 364), the blend weight being based on a surface normal (312; 360) of the depth image at the position (314; 364) and the viewpoints (320, 330, 340) from which the plurality of color images (144 - 144) were captured; generating a value of a delta quantization parameter (Δ QP) based on the blend weight; and determining a macroblock of the plurality of macroblocks of the color image corresponding to the position (314; 364) and associating the determined macroblock with the value of the delta quantization parameter (Δ QP) for the pixel; and determining a position (314; 364) of a point on a surface of the object based on a depth value of the depth image associated with that pixel; generating a blend weight corresponding to the determined position (314; 364), the blend weight being based on a surface normal (312; 360) of the depth image at the position (314; 364) and the viewpoints (320, 330, 340) from which the plurality of color images (144 - 144) were captured; generating a value of a delta quantization parameter (Δ QP) based on the blend weight; and determining a macroblock of the plurality of macroblocks of the color image corresponding to the position (314; 364) and associating the determined macroblock with the value of the delta quantization parameter (Δ QP) for the pixel; and performing a compression operation on the color image, a compression ratio of each of the plurality of macroblocks of the color image being based on the value of the delta quantization parameter (Δ QP) with which the macroblock is associated.