Offsets in geometry (from tutorial)

[tmelorc]

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Version: ImageMagick 7.0.4-2 Q16 x86_64 2017-01-02 http://www.imagemagick.org
Copyright: © 1999-2017 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Features: Cipher DPC HDRI OpenMP 
Delegates (built-in): bzlib freetype jng jpeg lzma png x zlib

I'm trying to learn how to use geometry features. Reading from https://www.imagemagick.org/script/comm ... p#geometry we have:

Offsets in geometry

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convert logo: -region '100x200+10+20' -negate wizNeg1.png
convert logo: -region '100x200-10+20' -negate wizNeg2.png
convert logo: -gravity center -region '100x200-10+20' \
  -negate wizNeg3.png

and quoting:

A negative offset can make sense in many cases. In the second example above, the offset is (-10,20), specified by -10+20. In that case, only the portion of the (virtual) rectangle obtained that lies within the image can be negated;

But I tried those 3 commands and the output is the same: the whole image was negated (I supposed that only the rectangular region should be negated).

Am I missing something?

[snibgo]

This may be a bug.

Try inserting "+region" after the negate.

[tmelorc]

This may be a bug.

Try inserting "+region" after the negate.

No progress.

[fmw42]

Is it possible that -region does not support gravity?

[GeeMack]

Is it possible that -region does not support gravity?

Maybe. Several months ago there was a discussion found at THIS link about "-region" and IM7.

[fmw42]

Did you try using

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magick convert ...

Is there even gravity support for -region in IM 6?

[tmelorc]

Did you try using

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magick convert ...

The same problem.

Thanks for helping and discussion but I'm only following the topic, since I have no deep knowledge to help to fix the possible bug/feature.

Regards.

[fmw42]

You could post your question about whether -region supports -gravity to the Developers or Bugs forum and see what the IM developers say.