Apparatus for processing image signal, program, and apparatus for displaying image signal

An apparatus for processing an image signal, the apparatus comprising:

• a first correction value derivation unit which outputs a first correction value for correcting an input image signal for each pixel of a line in a horizontal direction of a display screen, based on the input image signal;
• a second correction value derivation unit which outputs a second correction value for correcting the input image signal for each pixel of a line in a vertical direction of the display screen, based on the input image signal;
• a third correction value derivation unit which outputs a third correction value for correcting the input image signal for each pixel of the display screen which displays an image corresponding to the input image signal, based on the first correction value and the second correction value;
• and
• a correction unit which corrects the input image signal based on the third correction value,
• wherein the first correction value derivation unit outputs the first correction value based on a load for each pixel of the line in the horizontal direction of the display screen.