A display apparatus according to this invention performs control so as to reduce {TAIL ~ the difference} between image data input to a display unit and an image which is displayed on a display surface and acquired by an acquisition unit, based on {HEAD ~ the image data} and the image 
A display apparatus according to this invention performs control so as to reduce { TAIL ~ the difference } between image data input to a display unit and an image which is displayed on a display surface and acquired by an acquisition unit , based on { HEAD ~ the image data } and the image
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