Total Intensity Movies

1. All the images need to be restored to a common beam size. We restore the CLEAN components of each image onto a blank image with the task RSTOR. In order to avoid false interpretation of moving features due to effects of changing resolution, we use the largest beam amongst the images for all frames.

2. Images are then aligned relative to a common stationary (total intensity) feature, and a common image size (field of view) is chosen. The stationary feature can be, for instance, the (presumed) stationary core of a quasar jet or a bright feature in a maser source. We use the task LGEOM to perform this step.

3. Restored and aligned images are linearly interpolated with the task COMB to output a user specified number of frames at evenly spaced epochs. The number of frames determines the time elapse between the resultant movie frames and the weighting given to adjacent images in the interpolation.

A total intensity movie can now be compiled from these frames (section 2.2).