Abstract: Computer graphics requiring three dimensional representation needs very fine color shading which is not possible with only 8 planes (bits) per-pixel. In order to provide improved color shading with acceptable resolution a video raster signal, with n (e.g. 8) planes per pixel and based on a resolution of x pixels per line and y lines, can be selectively processed (M1, M2, M3) to provide mn (e.g. 16 or 24) planes per macro-pixel where m is an integer greater than 1 and m=m1.m2 where m1 is the dimension in pixels of each macro-pixel along the scan lines and m.sup.2 is the dimension of each macro-pixel transverse to the scan lines (in terms of lines of the normal raster). In one arrangement the 16 planes normally used to drive 3 color guns (red, green and blue) for an odd-even pixel pair are used for providing non-intersecting sets of 5 planes for each of the guns. In another arrangement the 8 planes for odd and even pixels (i.e.

Abstract: Computer graphics requiring three dimensional representation needs very fine color shading which is not possible with only 8 planes (bits) per pixel. In order to provide improved color shading with acceptable resolution a video raster signal, with n (e.g. 8) planes per pixel and based on a resolution of x pixels per line and y lines, can be selectively processed (M1, M2, M3)3) to provide mn (e.g. 16 or 24) planes per macro-pixel where m is an integer greater than 1 and m=m1.m2 where m1 is the dimension in pixels of each macro-pixel along the scan lines and m.sup.2 is the dimension of each macro-pixel transverse to the scan lines (in terms of lines of normal raster). In one arrangement the 16 planes normally used to drive 3 color guns (red, green and blue) for an odd-even pixel pair are used for providing non-intersecting sets of 5 planes for each of the guns. In another arrangement the 8 planes for odd and even pixels (i.e.