If no, the image is not displayed. The markpix task aids in the creation of bad pixel lists for CNOC image processing. A box is drawn around the indicated regions, with different colors for x and y interpolations, and the coordinates are saved on the output file for use with pppfixpix . The user provides the name of the image image on which to locate bad regions and the name of the output file bpfile to list the bad regions. The image is displayed on the imtool.
Subsequent input is read from the image cursor.
First, the user moves the cursor to any corner of a region to be used as defining a bad region. A diagnostic message is printed on the alpha terminal indicating that definition of a new region is in progress. The coordinates of the box corners and the type of interpolation are appended to the bpfile . Continue marking bad regions ins this manner, then press q to quit. Most regions of the CCD image will require x interpolation.