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img-window(n) 1.3 "Img"
img-window - Img, Tk Windows (window)
The package img::window is a sub-package of Img. It can be loaded as a part of the complete Img support, via package require Img, or on its own, via package require img::window.
The name of the new format handler is window.
This handler does not provide additional configuration options. This handler is special. Instead of reading or writing image data from a file or string it allows the embedding of a Tk widget into the photo image. In other words, it takes a snapshot of the contents of a Tk window.
All of the above means that in a call like
Image data in window format (option -data) is detected automatically. Image data is considered to be in the window format if the value given to option -data is the name of an existing Tk window.
Note that the standard option -file is not supported by this handler.
The format name window is recognized by the option -format.
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