![]() It is highly configurable and extensible to meet the evolving needs of the astronomical community.ĭS9 supports advanced features such as multiple frame buffers, mosaic images, tiling, blinking, geometric markers, colormap manipulation, scaling, arbitrary zoom, rotation, pan, and a variety of coordinate systems (including Image, Physical, Detector, and WCS). DS9 supports the direct display of FITS images and binary tables, multiple frame buffers, region cursor manipulation, many scale algorithms and colormaps, and easy communication with external analysis tasks. It also incorporates the new X Public Access ( XPA) mechanism to allow external processes to access and control its data, GUI functions, and algorithms. It is a Tk/Tcl application which utilizes the TkSAO widget set. This rule covers both positions and sizes.Reference Manual SAOImageDS9 Reference ManualĭS9 is the next version of the popular SAOtng display program. For LINEAR systems, pure numbers are in the units of the linear system. Otherwise, for all systems other than linear, pure numbers are degrees. In practice this means that for IMAGE and PHYSICAL systems, pure numbers are pixels. If no such system is explicitly specified, the default system is implicitly assumed to be PHYSICAL. In general, the rule is:Īll pure numbers have implied units corresponding to the current coordinate system. one without a format directive such as 'd' for 'degrees') is specified, its interpretation depends on the context defined by the 'coordsys' keyword. Size arguments # context-dependent (see below) Position arguments # context-dependent (see below) They can be specified as pure numbers or using explicit formatting directives: The arguments to region shapes can be floats or integers describing positions and sizes. wcsz.Įxample: wcsa linear point(100,100) # point=diamond If an image has multiple wcs's defined, use wcs# to specify which wcs to use for all wcs references. The default is the first header, or tile 1. In this case, use tile to specify which header to use in all coordinate conversions. While some coordinate systems are unique across mosaic images, others coordinate systems, such as image, or physical, are valid on a per segment basis. ![]() For this purpose, the following keywords are recognized: PHYSICAL # pixel coords of original file using LTM/LTV Strings may be quoted with " or ' or įor each region, it is important to specify the coordinate system used to interpret the region, i.e., to set the context in which the position and size values are interpreted. Not all properties are available via the GUI or are applicable for all regions.Īll regions may have text associated with them. In addition, the Line, Point, and Ruler regions have unique properties, not shared by others. It is set via '+' or '-' preceding the region. The exception is the Include/Exclude property. Properties are defined for a region in the comment section of the region description. Usage: bpanda x y startangle stopangle nangle inner outer nradius Įach region has a number of properties associated with the region, which indicates how the region is to be rendered or manipulated. Usage: epanda x y startangle stopangle nangle inner outer nradius Usage: panda x y startangle stopangle nangle inner outer nradius Usage: vector x1 y1 length angle # vector= Usage: ellipse x y radius radius angle# fill= If you are running DS9 and saoimage at the same time, then you must be in 8 bit. DS9 runs in both 8 bit and 24 bit environments, but saoimage is restricted to 8 bit. However, the overall time to finish rendering should almost be the same. ![]() DS9 supports a number of region descriptions, each of which may be edited, moved, rotated, displayed, saved and loaded, via the GUI and XPA. So with saoimage and ximtool, you see incremental progress, where DS9 will render the image all at one time. Regions may also be used for presentation purposes. Regions provide a means for marking particular areas of an image for further analysis.
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