Click on the 'Colors' menu tab at the top of the screen and then click 'Invert'.Pick one of the layers to keep (big or small depending on what you want) delete the other layer.Do NOT change the RGB color profile, click 'keep'.
You can use GIMP to edit if desired (did this successfully).Edit the cursor tiff image inside the Terminal App with for example Image editor (freeware) Terminal.app/Contents/Resources/ShadowedIBeam.tiffĪnd then run defaults write UseCustomIBeamCursor -bool YES
