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C. Preparing a Combined Flat-Field Frame

Once one has both a normalized small-scale sensitivity map, and a normalized illumination-correction frame, one can generate an overall flat-field frame by convolving the two. The simplest way to do this is to multiply the frames together. Figure 32 shows an example of this. One would then divide this frame into all data frames before any further processing.

  • Figure 32: A normalized flat-field, made from the convolution of a sensitivity map generated from lamp-flats and an illumination map made from sky-flats, all obtained on 16 June 2005.

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    Updated: 2009 August 20 [pbe]