Great tool! A few suggestions:
-Would be nice to have a note on the page here stating .NET v8 is required and the tool will prompt for install if necessary
-Enabling drag and drop for image loading would be a great speed and usability enhancement, especially when working with multiple images
-Currently the image preview is anchored on the left side, so any function that resizes the gui window displaces the button controls. This results in lots of excess mouse moving and window repositioning. If the controls were swapped left-right with the image preview (which receives no direct user interaction) then they would maintain spatial positioning on-screen much more consistently, smoothing the workflow and visual orientation
-A one-click quick export button that creates a new file with auto-incremented numbers appended to the filename would be nice, thus eliminating the need to see a File Save dialog on each export
-Perhaps enhance the export function to append relevant program settings as filename suffixes for easy reference later.
e.g. input file "Metal" exports to
"Metal--512x512_IsoLeft" or
"Metal--256x256_grayscale_IsoFloor"