[magick-users] image panning from the commandline using `display'

[Dean S. Messing]

Anthony Thyssen writes:
> "Dean S. Messing" on  wrote...
> | Suppose I have a 1000x1000 image named im.png.
> | 
> | If I execute `display -geometry 200x200 im.png' I get
> | a 200x200 "viewport" of the image aligned at the top left corner.
> | 
> | How do I move the viewport on the command line?
> | 
> | Add offests, say `display -geometry 200x200+150+300 im.png', just
> | moves the X-window on the desktop but the contents are the same.  Basically
> | I'd like to "pan" the image from the commandline. 
> | 
> That would be useful.
> 
> My first guess would have been to use -page.
> 
>    display -page 200x200+50+50 im.png
> 
> However while that opens a 200x200 window, it positions the window
> not the image.
> 
> Actually that probably should have been...
>    display -page 200x200-50-50 im.png
> 
> As "page" sets an images virtual canvas, then places the image on that
> canvas at the offset requested on that virtual canvas  As such the above
> would move the top-left pixel o fthe actual to -50-50 on the virtual
> canvas.
> 
<large snip>

Thanks, Anthony, for all the information and things to try.

A lot to aborb. So little time!