Re: Adding metadata to images
Re: Adding metadata to images
- Subject: Re: Adding metadata to images
- From: Shamyl Zakariya <email@hidden>
- Date: Fri, 6 Jul 2007 10:14:54 -0400
Is there another list I should ask this question on?
All I want to know is how to tag images I write out with metadata
that can be read by MDItem.
email@hidden
In the same episode, the scientist suggests that the
debigulation can only be reversed by a rebigulator.
-- wikipedia
On Jul 5, 2007, at 9:31 AM, Shamyl Zakariya wrote:
I'm writing an app which batch processes bumpmaps to normalmaps
when the user drops files ( or folders ) onto the app's batch window.
Now, I want to filter existing normalmaps from the files dropped.
Consider the situation where a user drops a folder full of bumpmaps
on the app, and generates normalmaps from the bumpmaps. Then later
the user decides to use different settings and drops the folder
back in to the app. I need to filter out the normalmaps that were
generated before.
I've already written some simple image analysis code which seems to
do a pretty good job filtering out normalmaps, but it occurs to me
that if my app were to somehow tag the images it saves as being
normalmaps I could easily use MDItem to extract that info and
discard the normalmap without having to perform a ( relatively )
expensive image analysis.
I know there's no generic way to add metadata to files, but since
my app generates *images*, and since there does seem to be a
standard set of metadata for images, I feel like I ought to be able
to tag the images with a "generated by org.zakariya.normalmappr" or
some other kind of tag. I could then filter out any file with that
tag without having to run image analysis.
So, is there any way to add a tag to an image file?
For context, my app writes the file by using NSBitmapImageRep's
representationUsingType: properties: method which gives me NSData.
I'm willing to use a different image writing approach if I can
embed generator metadata.
email@hidden
"negative, i am a meat popsicle."
-- Major Korben Dallas
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