JPEG compression factor via AS
JPEG compression factor via AS
- Subject: JPEG compression factor via AS
- From: Roger Howard <email@hidden>
- Date: Thu, 3 Jun 2004 10:55:55 -0700
Anyone have a workable idea for getting the compression factor from a
JPEG via AppleScript?
I thought ImageMagick or jhead might deliver this via a do shell script
call, but neither does. I'm hoping to avoid digging into the quant
tables in the files directly.
Photoshop itself seems to know this data, but has no direct way of
getting at it. For instance, when you open a JPEG and then do a Save As
and bring up the JPEG options dialog, it's pre-entered the previous
quant factor (on Photoshops 1-12 scale, which is accurate enough for my
needs). This text field, though, doesn't seem to be accessible via GUI
Scripting - and this is an area of AppleScript on OSX I haven't used
before, so I could just be missing it. Have tried several of the GUI
element inspectors and I don't see this text field called out in a way
I can get to.
The other option may be to bring up this JPEG options dialog and just
do a blind "copy" since the value in the Quality field is
pre-selected... but haven't gotten that working.
Ideally, I could get a rough quant factor directly with a shell tool of
some kind - but the usual suspects I know of don't report this info in
any meaningful way.
PS, not looking for a simple ratio of the compressed size vs the
original/uncompressed size... that'd be too easy :)
Thanks for any help,
Roger
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