unscale

verb

1. (transitive)To remove scales from (a fish or snake).

   “[an eagle] purging and unscaling her long-abused sight at the fountain itself of heavenly radiance”

2. (transitive)To undo a scaling transform upon.

   “Because OpenGL ES does not understand such a format, the vertex shader will then need to apply a matrix to unscale these values, which affects the vertex shading performance.”