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Hi Mark,
I think I understand at least some of what you are suggesting:
1. Use aliases to return a single value from a list of possible locations
This is in fact a common purpose of the Composite tags. So adding a
user-defined Composite tag can give you exactly this functionality.
2. Be able to use multiple aliases in a single invocation and identify
the values returned without knowing the contents of ExifTool_config
I assume you mean from the command line (since doing this via the API is
easy.) One way to do this is with something like this (using the -common
and -canon aliases for example):
> exiftool -common -xxx -canon -f image.jpg
ALIAS1: -
FileName: a.jpg
FileSize: 384 kB
Model: Caplio 500SE
DateTimeOriginal: 2007:05:23 14:30:09
ImageSize: 1280x960
Quality: -
FocalLength: 5.8mm
ShutterSpeed: 1/36
Aperture: 2.5
ISO: 248
WhiteBalance: Auto
Flash: Off
ALIAS2: -
FileName: a.jpg
Model: Caplio 500SE
DateTimeOriginal: 2007:05:23 14:30:09
ShootingMode: -
ShutterSpeed: 1/36
Aperture: 2.5
MeteringMode: Multi-segment
ExposureCompensation: 0
ISO: 248
Lens: -
FocalLength: 5.8mm
ImageSize: 1280x960
Quality: -
FlashOn: -
FlashType: -
ConditionalFEC: -
RedEyeReduction: -
ShutterCurtainHack: -
WhiteBalance: Auto
FocusMode: -
Contrast: -
Sharpness: Normal
Saturation: High
ColorTone: -
FileSize: 384 kB
FileNumber: -
DriveMode: -
OwnerName: -
SerialNumber: -
Here you can see which tags belong to which aliases because I have
asked for the non-existent ALIAS1 and ALIAS2 tags. With the -f option,
all requested tags are returned, and missing values are indicated by "-".
Does this do what you wanted?
- Phil
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