Re: JPEG compression factor via AS
Re: JPEG compression factor via AS
- Subject: Re: JPEG compression factor via AS
- From: Roger Howard <email@hidden>
- Date: Thu, 3 Jun 2004 12:12:32 -0700
On Jun 3, 2004, at 10:55 AM, Roger Howard wrote:
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 :)
Nevermind - managed to get jpegdump compiled, and wrote an AppleScript
wrapper for it... works like a charm!
-R
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