Image Coordinate System
An image coordinate system describes how locations are measured in the image. Some formats, such as FITS have a format standard requirement for coordinates. This specifies that the image be displayed with a particular coordinate system. Other graphics file formats such as TIFF, BMP, and JPEG, do not rigorously define a required coordinate system. The coordinate system definition used by Mira for working with images in all formats is based upon the FITS Standard and the FITS World Coordinate System extension to the Standard.
The image coordinate system describes the orientation of a displayed image, the way column and row positions are labeled and measured at the sub pixel level, how angles are references to zero, and also how position is attached to a world coordinate value The details are described in the topics listed below.
Image Display Orientation, Pixel Coordinate Definition, Angle Measurement Definition, Sub Pixel Coordinate Definition, World Coordinate System