Author 'Ainat00' (Id 243141 ) : I post here a photo of a test pattern screen. I have worked for 45 years in the graphic arts and I realize that your members and visitors request to correct some of the photos (often in brightness or contrast). We must see EACH BOX for COLOR SÉPARMENT, otherwise it will be necessary to proceed to a calibration of your screen to take advantage of the ideal conditions of viewing.