# AIPS HELP file for DOALIGN in 31DEC24

### HELP SECTION

```DOALIGN
Use:   Controls how two or more maps are aligned by various tasks.  If
DOALIGN positive (actually >= 0.1), then the images are aligned
by their coordinates and are required to have the same axis
increments, types, and rotations.  If DOALIGN is zero (actually
-0.1 < DOALIGN < 0.1), then the images are aligned by their
coordinates at the bottom left corner (computed linearly without
regard for rotation), but no other tests are made.  If DOALIGN is
-1 (actually <= -0.1 and >= -1.5), then the images are aligned by
offset from their reference pixels and no axis parameter tests
are made.  If DOALIGN = -2 (actually < -1.5), the images are
aligned at pixel (1,1,...) and the headers are ignored --- which
Null value:  true (1).

Procedures:
DOFARS........Procedure to aid in Faraday rotation synthesis using the
AFARS.........Is used after FARS to determine Position and Value of the
maximum.
BLANK.........Blanks out selected, e.g. non-signal, portions of an
image.
BLSUM.........Sums images over irregular sub-images, displays spectra.
BSCOR.........Combines two beam-switched images.
CMPLX.........Combines complex images by a variety of mathematical
methods.
COMB..........Combines two images by a variety of mathematical methods.
FARS..........Faraday rotation synthesis based on the brightness vs
wavelength.
FQUBE.........Collects n-dimensional images into n+1-dimensional FREQID
image.
GREYS.........Plots images as contours over multi-level grey.
HUINT.........Make RGB image from images of intensity & hue, like
TVHUEINT.
IMVIM.........Plots one image's values against another's.
KNTR..........Make a contour/grey plot file from an image w multiple
panels.
MCUBE.........Collects n-dimensional images into n+1-dimensional image.
MEDI..........Combines four images by a variety of mathematical
methods.
PCNTR.........Generate plot file with contours plus polarization
vectors.
TVHUI.........Make TV image from images of intensity, hue, saturation.
TVRGB.........Make TV image from images of true color (RGB) images.
```

AIPS