Image Editor with accurate dimensions
A program called Everclipper Plus would appear to meet your requirements, however this is not a full featured Image Editor, just purely one that provides a set of correctional tools.

From the blurb


  Features
  
  
  Resizing. You can resize a photo on it's length scale of one to ten. You can see the result of resizing before save it.
  Customizable sets of resizing sizes. You can make presets of resizing sizes as you like.
  Cropping. You can crop a photo at any position and to any size.
  Customizable sets of cropping sizes. You can make presets of cropping sizes as you like.