Wildcard image attribute dump

The latest GM 1.2 snapshot is now able to handle wildcarded attribute 
dumps for things besides EXIF.  So now it is easy to dump DPX header 
attributes:

% gm identify 11step_16b_lin.dpx
11step_16b_lin.dpx DPX 4096x1713+0+0 DirectClass 16-bit 40.2m 0.000u 0:01
% gm identify -format '%[dpx:*]' 11step_16b_lin.dpx
DPX:file.version=V1.0
DPX:file.filename=Image filename
DPX:file.creation.datetime=2005:04:26:16:21:17
DPX:file.creator=Creator
DPX:file.project.name=Project name
DPX:file.copyright=Copyright info
DPX:image.orientation=0
DPX:source.device.name=SPIRIT-4K DATACINE
DPX:source.device.serialnumber=00099
DPX:mp.film.manufacturer.id=02
DPX:mp.film.type=42
DPX:mp.perfs.offset=04
DPX:mp.prefix=441777
DPX:mp.count=4937
DPX:mp.frame.position=12756
DPX:mp.held.count=1
DPX:mp.frame.rate=0
DPX:tv.time.code=00:08:51:12
DPX:tv.user.bits=00:00:00:00
DPX:user.data.id=Thomson BTS
% gm identify -format '%[dpx:tv.time.code]' 11step_16b_lin.dpx
00:08:51:12
% gm identify -format '%[dpx:tv.*]' 11step_16b_lin.dpx
DPX:tv.time.code=00:08:51:12
DPX:tv.user.bits=00:00:00:00

This is much faster than using 'gm identify -verbose'.

Bob
======================================
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/


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