Region-of-interest. Specifies a rectangular region-of-interest (ROI) in the composite image, expressed in pixels.
rgn= coord , size
Pixel offset from the top-left corner of the composite image to the top-left of the ROI (int, int).
Size of the ROI in pixels (int, int).
rgn= only defines an ROI without cropping the image. When wid= and/or hei= larger than size are applied as well, additional data from the composite image may be visible in the final reply image.
View attribute. Applies regardless of the current layer setting.
Any areas of the ROI extending outside the composite image are padded with bgc= .
rgn= is applied before final scaling and fitting with scl= , wid= , hei= , fit= , rect= , or align= .
Entire composite image ( rgn=0,0,width,height ).