  We develop a new deconvolution method to improve the angular resolution of
the Crab Nebula image taken by the Hitomi HXT. Here, we extend the
Richardson-Lucy method by introducing two components for the nebula and the
Crab pulsar with regularization for smoothness and flux, respectively, and
deconvolving multi-pulse-phase images simultaneously. The deconvolved nebular
image at the lowest energy band of 3.6--15 keV looks consistent with the
Chandra X-ray image. Above 15 keV, we confirm that the NuSTAR's findings that
the nebula size decreases in higher energy bands. We find that the north-east
side of the nebula becomes dark in higher energy bands. Our deconvolution
method can be applicable for any telescope images of faint diffuse objects
containing a bright point source.
