Reduced image generation.

摘要

A method of making a reduced image of an original x by y pixel image (57), each pixel being defined by three components in a 3-D colour space comprises dividing the original image into blocks, each block corresponding to a pixel in the reduced image; and, for each block, determining if all pixels have the same colour. If they do the corresponding pixel in the reduced image is made that same colour. If they do not, then determine the average value of each of the plurality of components in the blocks adjacent the block. If there is a unique identifiable background colour in the blocks adjacent the block, then locate the position of the colour in said 3-D colour space as a first point, locate the position of the average colour of the block in the 3-D colour space as a second point, and select as the colour of the corresponding pixel in the reduced image a colour at a point in said 3-D colour space which is a distance along a line connecting the first and second points which is in the same direction as and further from the first point than the second point.