1. An image processing method comprising: receiving a compressed image comprising a plurality of pixels, each pixel being represented by a pixel value having a predefined number of bits in a gray scale format; decompressing the image, wherein decompressing the image comprises mapping the pixel value into two channels of a multi-channel output buffer such that each channel has fewer than the predefined number of bits; rendering, with a processor, a scene of the image based upon camera coordinates; and for a rendered pixel, sampling a plurality of red (R), Green (G) and blue (B) values, converting the plurality of RGB values to the gray scale format having the predefined number of bits, performing an interpolation of the RGB values following conversion to the gray scale format and performing a window/level operation on a result of the interpolation.