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DrizzlePac 2012 Handbook
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The DrizzlePac Handbook > Appendix D: Previous Drizzle Software Packages > D.4 WCS-enabled Dither Tasks

D.4 WCS-enabled Dither Tasks
Instead of explicitly providing all of the alignment information, the input image’s WCS information can be used in conjunction with the distortion coefficients to place the image in the output frame. This can be done using WCS-enabled versions of the basic drizzle and blot tasks, as well as the coordinate transformation tasks traxy and tranback. These tasks allow the user to simply specify the output WCS information or use the WCS information of an existing drizzled image to define the output frame. The WCS keywords from the input image will then be fit to the WCS derived from the output frame to determine how to place the image in the output image without requiring the user to explicitly provide offsets, rotations and scale changes as required by the original Drizzle task.

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