For the presentation of the stereo-image, the 3D-display of X3D Technologies uses the special optical filter structure. One of the problems appearing here is the adjustment of the optical filter with respect to the surface of the pixel structure. In many practical cases the width of the display's subpixel is not known exactly or in the process of the creation of the optical filter the attempts to realize the required sizes with a necessary accuracy failed. For the solution of these problems we suggest using the scaling, translation or rotation of the stereo-image to adjust the size of the elements of the structure of the optical filter with the pixel structure of the 3D-display. We demonstrate here also that the scaling of the stereo-images has some special features in contrast to the scaling of ordinary 2D-images. The approach may be applied also to displays with a different pixel form or with individually different widths of the RGB subpixels. The numerical algorithms based on the approach considered here have been successfully tested on our 3D-displays. These approaches may also be used for 3D-displays based on lenticular lenses.