Hi,
I am thinking of creating a way of doing image rendering through sling
and thought I would first check with the community as to whether this
has been thought of, and whether there are any thoughts on how this may
work.
Thoughts that I have had as to what this can be used for are (among others):
* scaling
* rotation
* watermarking
* layering (i.e. use one image as background another as foreground)
* format changing e.g. png -> jpg
* quality change (to reduce size of say jpg)
So say /img/test is a png image (with sling:resourceType = "abc/def")
and I requested /img/test.jpg that something would reformat the image
from png to jpg. If I requested /img/test.small.jpg the image would be
reduced and the format changed.
So I guess the most "basic" way of doing this would be to write a
servlet that specifically did a certain type of image creation /
manipulation. But this seems a little tedious to me, and not very
customizable by someone in the future. Another thought would be that
something like JSP or Groovy would be used to do the image manipulation
and there was a script that did this say: /apps/abc/def/jpg.jsp
One of the issues I see with this is that it would require the imageio
and jai libraries to be added somewhere that would then be visible to
this even though in most cases nobody would use jsp for this etc. Also
I don't think this would be that easy for someone who doesn't know a
reasonable amount about jai and imageio.
What I have been thinking about and what I am proposing is another
scripting bundle that is specifically used for image creation and
manipulation. This would then have some sort of source (still thinking
about how this would work) that would define the processing to perform.
Initial thoughts are something along the lines of a set of parameterized
JAI operators, e.g. SubsampleAverageDescriptor, UnsharpMaskDescriptor,
AddDescriptor.
Maybe not strictly a script either but a set of nodes in the repository
which makes up the "script"?
Would be interested in any feedback, other options etc. before I start
design / development of this.
Cheers
Bryce
