On the GY-HD110U/GY-HD200/GY-HD250 series cameras this process is provided in an advanced Menu accessed while in 24p mode. You must be in 24p mode for this operation: Hold the Focus Assist button (the one on the camera body) simultaneously with the Menu/Status button for at least 5 seconds.

You will see an advanced menu where the second line says CAMERA1. Move the cursor down and push the shutter wheel to enter that menu. Now you see a list with the sixth item being PIXEL COMPEN. Move down to it and select that item. The word CANCEL blinks. Change it to EXECUTE and push again. It takes about 10 seconds or so to perform the operation then it tells you to power off the camera. You are done. Make sure Focus Assist is now OFF and exit 24p mode if desired.

NOTE: This works best on a camera that is warm. We advise turning the camera on and let it sit for ½ hour or so before doing this operation. You can even wrap it in a blanket. It may be necessary to perform the procedure more than once. This works for all the ProHD JVC cameras.