Can not unset Image Artifacts (EG: -set option:... )

[anthony]

You can set a Image Artifacts (for operators) using

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-set option:xyzzy 1

or

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-define xyzzy=1

EG:

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convert xc: -set option:xyzzy 1 -define foobar=1 -verbose info:

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...
  Artifacts:
    verbose: true
    xyzzy: 1
    foobar: 1
...

However you can not unset them using +set or +define

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convert xc: -set option:xyzzy 1 +set option:xyzzy -verbose info:

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...
  Artifacts:
    verbose: true
    xyzzy: 1
...

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convert xc: -define xyzzy=1 +define xyzzy -verbose info:

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convert: no such option `xyzzy' @ error/convert.c/ConvertImageCommand/1147.

This works fine for normal "Image Property" settings..

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convert xc: -set xyzzy 1 -verbose info:

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...
  Properties:
    date:create: 2010-06-01T11:56:08+10:00
    date:modify: 2010-06-01T11:56:08+10:00
    signature: ce8bee525d6736e9825261b19a9b51719f9dc4bb728e95cf7067a2142b03b362
    xyzzy: 1

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convert xc: -set xyzzy 1 +set xyzzy -verbose info:

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...
  Properties:
    date:create: 2010-06-01T11:56:08+10:00
    date:modify: 2010-06-01T11:56:08+10:00
    signature: ce8bee525d6736e9825261b19a9b51719f9dc4bb728e95cf7067a2142b03b362

[magick]

We can reproduce the problem you posted and have a patch in ImageMagick 6.6.2-2 Beta. Thanks.