Abstract: An image rotation method and an image rotation processing apparatus in an image processing apparatus are disclosed. The image rotation method obtains the image coordinates (x',y') of a rotated image which is recorded in a second memory, by sequentially scanning a first memory where the M.times.N original image is recorded and adding the increments of x and y corresponding to a rotation angle .theta. repeatedly, and transmits the image element data of the coordinates (x,y) of the first memory to the coordinates (x',y') of the second memory with one-to-one correspondence, thereby obtaining the rotated image through the rotation angle .theta. from the original image. Thus, the present invention can obtain the rotated image using only addition operations and without any multiplication operations, so that high-speed operation is possible and an image can be rotated through a specified angle .theta. through software in common computer graphic systems having no floating point multiplier.