Putpixel allows the user to select a window to display the actual pixel values of an image.
The features provided by putpixel include:
putpixel can be executed from the command line user interface (CLUI):
putpixel -i input.filename
If you wish to use the Graphical User Interface then type:
putpixel -gui
and wait till you see the graphical user interface.
Then make your selections.
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GUI for putpixel