Images and Related Concepts

The main purpose of GalSim is normally to create images that simulate real astronomical observations. As such, the Image class is the most common class in GalSim that you will likely be working with.

An image if fundamentally an array of pixel values plus a bounding box indicating the range of position values for those pixels, and a definition for how the image coordinates relate to positions on the sky.

For the former concept, the Bounds class defines which x and y values are contained in the image, and the Position class is used to describe a particular location on an image.

For the latter concept, the simplest option is to just set a uniform pixel scale, e.g. in arcsec/pixel. But a wide range of more complicated World Coordinate Systems are also possible.

• The Image class
  • Image
  • _Image()
  • ImageF()
  • ImageD()
  • ImageI()
  • ImageS()
  • ImageUI()
  • ImageUS()
  • ImageCF()
  • ImageCD()
• Bounding boxes
  • Bounds
  • BoundsI
  • BoundsD
  • _BoundsI()
  • _BoundsD()
• Positions
  • Position
  • PositionI
  • PositionD