BrightSign Object Reference Manual (FW 5.1) - Manual (Page 84)

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a["Filename"] = "test.JPG"
a["Mode"] = 0
a["SourceX"] = 600
a["SourceY"] = 600
a["SourceWidth"] = 400
a["SourceHeight"] = 400
i.DisplayFile(a)
This displays just a portion of the image test JPG starting at coordinates SourceX, SourceY, and SourceWidth by
SourceHeight in size. The viewmode is still honored as if it were displaying the whole file.