Processing device for performing gamma correction

A processing device comprising:

• generation circuitry configured to generate a first index based on a numerical value of a high-order number of digits in an input value represented by a bit string and a shift amount based on a numerical value of a low-order number of digits excluding the high-order number of digits;
• storage circuitry configured to store in advance, for each of indexes obtained by the generation circuitry, converted values of reference input values corresponding to the indexes as a look-up table;
• and
• interpolation circuitry configured to compute a second index that adjoins the first index by carrying out increment or decrement of the first index, and acquire converted values corresponding to the first index and the second index using the look-up table in the storage circuitry, and compute a converted value of the input value by linearity interpolation based on the shift amount from the reference input value of the first index,
• wherein the interpolation circuitry is configured to perform interpolation with an index larger by one than the first index as the second index in case of the first index is not a maximum value of the index stored in the look-up table, and configured to perform extrapolation with an index smaller by one than the first index as the second index in case of the first index is the maximum value of the index stored in the look-up table.