possible bug deskew:angle string format

[fmw42]

IM 6.9.10.0 Q16 and IM 7.0.8.0 Q16 HDRI Mac OSX Sierra

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convert -size 200x100 xc:white -background black -rotate 5 -background black -gravity center -extent 300x300 rect.gif

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convert rect.gif -format "%[deskew:angle]" info:

convert: unknown image property "%[deskew:angle]" @ warning/property.c/InterpretImageProperties/3979.

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magick rect.gif -format "%[deskew:angle]" info:

magick: unknown image property "%[deskew:angle]" @ warning/property.c/InterpretImageProperties/3947.

Reference: http://www.imagemagick.org/script/escape.php

[magick]

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convert rect.gif -deskew 0x1 -format "%[deskew:angle]" info:
-4.9117881725059939768

[snibgo]

I don't think it's a bug. I think "%[deskew:angle]" is calculated by the "-deskew" operation, and is not set until that operation.

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f:\web\im>%IM%convert rect.gif -format "%[deskew:angle]" info:
convert.exe: unknown image property "%[deskew:angle]" @ warning/property.c/InterpretImageProperties/3780.

f:\web\im>%IM%convert rect.gif -deskew 40 -format "%[deskew:angle]" info:
-4.68954

[fmw42]

Thanks. I understand now.