The difference between polar and spherical panoramas is actually very distinct. A polar panorama most closely resembles a planet since all of it is contributed to it. A spherical panorama is a lot more different than the polar panorama. The spherical panorama has everything distorted in the middle, kind of like looking through a concave lenses. Because of this effect, everything on the edges is attracted to the center.
The problem with the tiny planets is that there is usually a line in the center of where the two sides of the panorama meet, giving away the illusion! We usually have to stamp and smudge over these lines. To stamp we have to copy the surrounding background color to take the definition off the line. The smudge tool takes out any stamp that left its mark too deep. The portraits also include shadows coming from where the sun is, giving the illusion of a tiny world with its own sun.
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