Create Width and Height fields in Images like MaxWidth and MaxHeight.

Create Width and Height fields in Images Mapping like MaxWidth and MaxHeight.
This fields should work as the actual Width and Height (in pixels) the Image should have (Ratio should be applied if only one field is given).
MaxWidth and MaxHeight should work as

if (image.width > maxWidth) {
    widthToDisplay = maxWidth;
} else {
 widthToDisplay = image.width;
}