Pixel data is stored in a field corresponding to a pixel of an image. The field includes an opacity bit and a set of bits. If the opacity bit is set to an opaque-indicating state, then a color level value of a component color of the pixel is stored in the set of bits. However, if the opacity bit is set to a transparency-indicating state, then a transparency level value is stored in at least one bit of the set of bits and the respective color level value is stored in other bits of the set of bits.