When you warp an image with the warp tool the distortion is interpolated in a curved manner. It would be good to have the option to warp it in a linear manner.
For example, if I were to use the warp tool with this image as shown
The result looks like this:
It’s impossible to make the lines straight. You need to use the perspective tool, but re-selecting different parts of the image each time. This requires being very accurate with the selection, to make the join seamless
It would be handy if instead of the curved interpolation between the columns and rows of the warp cage, you could choose to have each cell treated the same as the way the perspective tool works, but with the benefit of there being more than four control points, and seamless joints between cells.
This would also apply to the other warp modes.