|PDF File||Title||Goal||Data Description||DrizzlePac Tasks|
|WFC3/UVIS: Optimizing Image Alignment for Multiple Visits||Align and combine three images taken at different visits and orientations.||Three full-frame UVIS F606W images of Omega Centauri, each with exposure time of 40 sec, each taken in a different visit with different roll angle and offset.||TweakReg AstroDrizzle|
|WFC3/IR: Optimizing Image Sampling for a Single Visit||Optimize image sampling using final_pixfrac and final_scale settings in astrodrizzle,for WFC3/IR images.||Spiral galaxy NGC 3370 in F160W, observed with a WFC3-IR-DITHERBOX-MIN pattern. All observations were obtained in the same visit with same orientation.||AstroDrizzle|
|ACS/WFC: Optimizing Image Alignment for Multiple Visits||Align and combine three images taken at different visits and orientations.||Three F606W images of the dense star field NGC 104, each with exposure time 339 sec. The images are CTE-corrected calibrated files with suffix *_flc.fits.||TweakReg AstroDrizzle|
|ACS/WFC: Optimizing Image Sampling for a Single Visit||Optimize image sampling using final_pixfrac and final_scale settings in astrodrizzle, for ACS/WFC imges.||A two-point dither line with sub-pixel dithers at each point: four images of galaxy NGC 4449 taken with the F555W filter. The images are CTE-corrected calibrated files with suffix *_flc.fits.||AstroDrizzle|
|WFC3/UVIS: Aligning Images in Different Filters by Defining an Output Reference Frame||Two sets of drizzled images, each for a different filter, are aligned by WCS and in pixel space.||Observations of galaxy M83 in F814W and F438W, each filter set taken in different visits. There are three images per filter.||Tweakback Tweakreg AstroDrizzle|
|WFC3/UVIS: Alignment of Sparse Fields Using Headerlets||Use headerlets to align and combine three images with a high degree of precision.||Three full-frame 420-second UVIS F606W images of GRB-110328A observed in a 3-point dither pattern.||Tweakreg AstroDrizzle Apply_headerlet|
|Aligning and Drizzling WFPC2 Images||Strategies for dealing with severely undersampled WFPC2 images.||Six dithered images of Messier 2. Most objects are in the WF chips (plate scale 0.1"/pixel).||Tweakreg AstroDrizzle apply_headerlet_as_primary|
|Using SExtractor Catalogs to Align ACS/WFC Images||Use External SExtractor (v2.8.6) Catalogs from *_crclean.fits Images to Align ACS/WFC Images with Tweakreg||Alignment of four ACS/WFC images, about 60 pixels apart, using a catalog generated by SExtractor. The image contains a large number of extended sources, but relatively few point sources.||TweakReg TweakBack AstroDrizzle SExtractor|
Some of these examples make use of configuration files (.cfg).
A primer on working with configuration files can be found here.