In the second example, the command only produces one image. In the
past, without knowing the use of
+[x-pos]+[y-pos], I got more
than one image, and needed to delete them except the desired
When I wrote a post about
screendump, I took a screenshot of TTY1 so
as to prove that the text that followed the screenshot was really
contents in TTY1.2 The width and height of the screenshot was
1280 px and 1024 px respectively. I then used my old way to crop it
to an image with width 520 px and height 230 px, and got similar error
message described in ImageMagick’s examples.3.
There’s an image cropped with ImageMagick in “Usage” in Record Linux Terminal.
$ convert src.png -crop 512x225+0+0 tty1.png