Embodiments perform an iterative process for enlarging a rectangle having a fixed aspect ratio within a convex polygon to find the largest rectangular area within the convex polygon. The iterative process includes detecting an intersection of one or more corners of the rectangle with the convex polygon and adjusting a position of the rectangle based on the quantity of intersecting corners. The iterative growth process continues until a maximum inscribed size of the rectangle has been determined. Some embodiments process images from bracketed photography and crop areas outside the determined maximum inscribed size when combining the images into a single image.