The main menu option "Integration type" is used to compute 1-d integrated profiles. The submenu choice "Circular" builds a profile by integrating around circles centered at the center of the image. For each pixel on the right horizontal radius from the image center, a circle of pixels exactly one pixel thick is averaged. Only exact pixel values are used, with no interpolation. The resulting integrated profile in the radial direction is displayed in the cut and profile subwindow as a yellow curve.
If a line cut has been taken, the cut and profile subwindow shows the line cut and the integrated profile using the same horizontal length scale. If no cut is defined, the profile width is fitted to the subwindow.
The center point for circular integration is by default the center of the image, i.e. the pixel whose coordinates are one-half the full size of the image. To redefine the center, see the option "New Center of Image" in the "Zoom Options" menu.
Note that the integration circles are in no way related to the red circle used for circular cuts.
The submenu choice "Rectangle" under "Integration type" is only active when "Subregion type" "Rectangle" has been selected. Otherwise this entry appears in gray to indicate that it is not ready to use.
A profile of transverse integrals along the axis of the rectangle is found by averaging each column of pixels in the rectangle. Only exact pixel values are used, there is no interpolation.
The result is plotted in the cut and profile subwindow as a magenta curve. If a line cut has been taken, it is drawn using the same horizontal distance scale as the profile.
The submenu choice "Sector" under "Integration type" is only
active when "Subregion type" "Sector" has been selected. Here
"Sector" is active and selected; parts of the sector are visible around the borders
of the pop-up menu.
A profile of azimuthal integrals along the axis of the sector is plotted at the bottom as a blue curve. The averages are taken by resampling the image on a grid of points uniformly spaced in polar coordinates. This resampling grid is constructed so that the radial spacing is equal to one pixel width; the angular spacing is one pixel width at the average radius. The intensity value at each grid point on the resampling grid is interpolated from neighboring pixel values.
The average is taken along each arc, and the result is drawn in blue in the cut and profile subwindow. If a line cut has been taken, it is plotted using the same horizontal distance scale as the profile.
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