I found this formula.
Left(ImageName, Position(ImageName;" ";1;1) -1)
which works. However, it will remove the text if it's format is with out a space after the name. Ie
If the field is "12345" the formula will remove it. Thus showing a blank.
Also if the image name is "12345.jpg" it does not remove the ".jpg". Which I believe the formula needs to be modified for this situation.