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*tvmark* - Mark pixel positions on the display

This can be used to overlay the position of fiducial stars onto an image, for example. Positions can be input manually or from a list.

To position marks interactively display the image and then

  cl> noao
  no> images
  im> tv
  tv> tvmark 1 STDIN interactive+

  type . to put dot at cursor position
  type + to put cross at cursor position
  type c to put circle at cursor position (must specify hidden parameter ``radii'')
  <ctrl>d to exit

See help file and parameters for other options.

To display marks from a list, ``starpos'', the list should have the format of a double column with positions in logical coordinates (= same as saoimage readout).

  pr> tvmark 1 starpos interac-