1. A method comprising: determining a single disparity value for a region of a picture, the picture having a particular resolution and the single disparity value being specific to the particular resolution and to the region, wherein the region of the picture is coextensive with a first integer number of pixels in the particular resolution, and coextensive with a second integer number of pixels in a second resolution, and wherein a size of the region is smaller than a size of the picture, the size of the region being based on a combination of (i) the first integer number of pixels in the particular resolution and (ii) the second integer number of pixels in the second resolution; and converting the single disparity value to provide another single disparity value specific to the region and to a combination resolution determined as a combination of the particular resolution and the second resolution, wherein the another single disparity value is associated with the first integer number of pixels in the particular resolution.