  We suggest a transform theory for calculating a density distribution of small
colloids around a large colloid from a force curve between the two-large
colloids. The main idea (calculation process) is that the force curve between
the two-large colloids is converted into the pressure on the surface element of
the large colloid. This conversion is different from the celebrated Derjaguin
approximation. A numerical matrix calculation is performed in the conversion to
calculate it more precisely. Subsequently, the pressure on the surface element
is transformed into the density distribution of the small colloids around the
large colloid by using a transform theory for surface force apparatus proposed
by Amano. In this letter, the process of the transformation is explained and a
prototype result of the transformation is shown.
