Using CCDs to map the isophotes
of these galaxies has revealed some interesting structures.
To date, the numerous approaches [3-8] have been proposed for image inpainting since the seminal work of BSCB [3,4]: for example, the classical Total Variation (TV)  and Curvature-Driven Diffusion (CDD)  models, which are based on solving Partial Differential Equation (PDE) to preserve the directions of the isophotes
in the missing region.
Morse and Schwartzwald  considered smoothing the isophotes
of the HR ima ge to reduce the undesirable artifacts.
In the steady state, when [partial derivative]u/[partial derivative]t = 0, the direction of the largest information change is perpendicular to the isophotes
Cadmus Fashion automatically generates color maps that enable users to compare and analyze curvature, deviation, contours, isophotes
, or contours of equal brightness, are approximately circular around the center and the variation of brightness outward is close to that of an inverse square law.
The software will stack and average images, center them with respect to each other, mosaic them to create wide-field scenes, display a histogram of pixel intensities, display isophotes
, blink two images to compare differences, and perform photometry on starlike objects.