Image processing

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RAW images

Each image is converted from the CR2 raw Canon format to single precision floating point FITS format using dcraw (to convert from raw to pgm) and then Cfits (to read pgm file and save as FITS).
Example FITS file: IMG_0000.fits (size = 58 MB), and corresponding .info ASCII file IMG_0000.info .

RGB images

Individual R, G and B channels can be reconstructed from the single raw images by interpolation. The simplest interpolation is to replace, for each channel, the missing pixels by the average of neighbor pixels. For example, the sample image G channel interpolation gives the following result: img.fits .

Astrometric / photometric calibration

Identifying point sources

Page content last updated: 27/06/2023 06:35:52 HST
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