1. A system, comprising: one or more processors; and memory, communicatively coupled to the one or more processors, storing instructions executable by the one or more processors to perform operations comprising: computing an energy value for each pixel in an image based, at least in part, on a derivative of a neighboring pixel; generating a seam carving mask for the image based, at least in part, on the computing, the seam carving mask comprising data representing one or more pixels to be protected from or targeted by an image editing operation; displaying the seam carving mask as an overlay of the image; in response to receiving user input, modifying the displayed seam carving mask, the modifying comprising adding data representing one or more additional pixels to the seam carving mask or removing data representing at least a subset of the one or more pixels from the seam carving mask; and storing data representing the modified seam carving mask for use in a subsequent image editing operation directed to the image.