Patent ID: 8427549

Claim:
An apparatus comprising: an acquisition unit configured to acquire an input image; a conversion unit configured to convert the acquired input image to an output image of lower bit depth; a detection unit configured to detect in the input image a pixel having a predetermined luminance; a comparison unit configured to compare a gradation of the input image with a gradation of the output image; a calculation unit configured to calculate a position of the output image corresponding to a position of the detected pixel in the input image, if the gradation of the input image is greater than the gradation of the output image; and a display unit configured to display the output image on a screen so that the calculated position is identifiable, wherein the detection unit further detects a pixel having a predetermined luminance in the output image, and wherein the display unit further displays a position of the pixel having the predetermined luminance in the output image to be identifiable from the calculated position.