1. An image processing method to display a stereoscopic image on a target screen, wherein a disparity information is associated with said stereoscopic image and is adapted for the display of the stereoscopic image on an original screen, the size of the original screen being different from the size of the target screen, the format of the original screen being different from the format of the target screen, the stereoscopic image comprising a first image and a second image, the method comprising the following steps: selecting a part of said first image according to at least one property associated with the first image and according to the size and the format of the target screen, calculating a target disparity information associated with the selected part of the image according to viewing conditions associated with the target screen and original disparity information associated with the selected part of the first image.