imshift
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Shift the reference pixel of a CASA image header by a specified angle in RA/Dec. See also
normallizeImage,
scaleImage, and
imageRegister.
Usage:
au.imshift(img, rashift, decshift, copyimage=True, absolute=False)
- rashift: value in arcsec to subtract from CRPIX1
- decshift: value in arcsec to subtract from CRPIX2
- copyimage: if True, then first copy the image to *.imshift (to avoid changing the original)
- absolute: if True, then treat rashift and decshift as absolute degrees; or, if they are strings, then treat as HH:MM:SS.S and DD:MM:SS.S
Example:
CASA <2>: au.imshift('hpacs_3HPPPPB_273.57_-17.50_v1.0_1396014183448.image',+1.29,-2.75)
Copied image to hpacs_3HPPPPB_273.57_-17.50_v1.0_1396014183448.image.imshift
Shifting RA by +1.290000 arcsec = -0.645000 pixels
Shifting Dec by -2.750000 arcsec = -1.375000 pixels
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ToddHunter - 2014-06-07