An image output system processes an input image signal from an image signal source, such as a television camera, to produce an output image signal to record an image on an image recording medium. The input image signal is logarithmically converted into an image signal which matches the image output system, using a first look-up table which is selected to match the image signal source. Then, the image signal, which has been converted by the first look-up table, is linearly converted into an image signal based on first corrective parameters set to achieve given color qualities. The image signal, which has been linearly converted, is converted an image signal which matches the image recording medium, using a second look-up table which is selected to match the image recording medium. The image signal, which has been converted by the second look-up table, is exponentially converted into an exponential output image signal based on second corrective parameters set to achieve given color qualities.