Selecting complex objects

Hi All,
I'm trying to select just the leaf in the following picture:
http://grove.ufl.edu/~ashenkin/1-2-19.jpg
I've tried using magic wand in various steps, and it gets pretty good
if I work at it for a while using channels. The problem is that I have
about 120 of these images to process and would prefer to find a better
way to do it. I've downloaded Mask Pro 3, and that doesn't seem to do
as well as just using the magic wand when I set up keep and drop color
pallets.
I'm thinking of this problem in 2 ways: one part of it is selecting
based on color. The problem is that, between the leaflets, the color
of the white background gets shaded and looks rather like the color in
some of the leaflets. So the second part I would like to incorporate
is a sense of edge in the image, rather than pure raster colors. It
seems to me this should be a doable task, but I'm not sure if the tools
are available to accomplish it.
Thanks for any thoughts!
Best,
Allie

Als_trash@hotmail.com

Re: Selecting complex objects

Any chance of adding a small jpeg of the image to your next reply so we can
see exactly what you are after.
Thanks for the tip. Good video. However, my problem remains that some
of the colors I want to mask out are the same colors that I want to
keep. Dodging and Burning aren't going to do the trick for me.
Channel Mixing doesn't differentiate the areas I need differentiated,
because the keep/drop colors, in the tight areas, are essentially the
same. The real difference between the keep areas and the drop areas
are that the keep areas are enclosed within circles of like colors,
while drop areas are between those circles (not enclosed).
In the end, I've reconciled myself to do a first cut selection with a
magic brush to get the general range of colors I'm looking for, then
using a quick mask to fine tune that selection.
I still hold to my opinion that color differentiation married with edge
detection/contour mapping algorithims should, in theory, be able to
tackle this problem. Taking a look at a high-pass filtering of the
image gives an idea of where one might start. But it's something,
apparently, yet to be developed. Thanks very much, everyone, for all
your help. This has been interesting and educational.
Best,
Allie


My View

Re: Selecting complex objects

Thanks for the tip. Good video. However, my problem remains that some
of the colors I want to mask out are the same colors that I want to
keep. Dodging and Burning aren't going to do the trick for me.
Channel Mixing doesn't differentiate the areas I need differentiated,
because the keep/drop colors, in the tight areas, are essentially the
same. The real difference between the keep areas and the drop areas
are that the keep areas are enclosed within circles of like colors,
while drop areas are between those circles (not enclosed).
In the end, I've reconciled myself to do a first cut selection with a
magic brush to get the general range of colors I'm looking for, then
using a quick mask to fine tune that selection.
I still hold to my opinion that color differentiation married with edge
detection/contour mapping algorithims should, in theory, be able to
tackle this problem. Taking a look at a high-pass filtering of the
image gives an idea of where one might start. But it's something,
apparently, yet to be developed. Thanks very much, everyone, for all
your help. This has been interesting and educational.
Best,
Allie
site


Als_trash@hotmail.com

Re: Selecting complex objects

I was looking all over adobe's site for this one. I think it's exactly
what als_trash needs.
Thanks for the link; I bookmarked that puppy.
--
§¦: } theartist


Theartist

Re: Selecting complex objects

Also check out Advanced Masking tutorial (movie) at Russell Brown's website
along with a couple of other masking techniques at this site.
http://www.russellbrown.com/tips_tech.html


My View

Re: Selecting complex objects

I forgot to mention that, in the end, I'm only interested in getting
the total area of these leaves. Thanks again to all who have replied!
allie


Als_trash@hotmail.com

Re: Selecting complex objects

The problem with things like Magic Wand and Lasso is that they don't came
anywhere close to doing a good job, not without a lot of extra fine tuning
work which can take more time than just using the Quick Mask mode and a
brush.
R


Hebee Jeebes

Re: Selecting complex objects

Actually, not as much time as you think. Doing it with a plug-in you have to
learn the plug-in and then you have to fix the less than perfect masking
generated by the plug-in. This will take more time than Quick Mask mode and
a paint brush. Using the lasso tool or other methods and do a good job at it
will take probably more time. If you zoom to say 300 or 400 perfect the
Quick Masking goes fast. Just edge the out side with a small brush so it is
nice and tight and then use a larger brush zoomed out to fill in. Don't use
the fill tool, you will get an edge between the fill and the brushed edge.
Just paint it in. I have found very few things that I couldn't mask out this
way and quickly tool. A graphics tablet will make things faster, but a mouse
works fine too.
R


Hebee Jeebes

Re: Selecting complex objects

Thanks Mike and Granny,
The idea of using levels is a good one.
Mike, the one issue with your method is that some of the pixels I don't
want are of similar color to those I don't want. So, adjusting the
levels doesn't quite help me all that much. Algorhitimically, these
similarly-colored pixels should be somewhat separable through edge
detection, which is what I was getting at before. Those pixels could
be dealt with, as you mention, through use of a paintbrush/pencil.
Again, we get into the issue of time-consumption.
Granny, I think Colin's algorithim amounts to the same method as
Mike's, with some good ideas of how to fill in areas which were spotty.
Thanks for both your ideas - I appreciate your input.
Best,
Allie


Als_trash@hotmail.com

Re: Selecting complex objects

A simple easy way of Masking out Difficult Images in Photoshop is to use
Color range then use Channels to help mask out a complex objects with
clean edges as presented in the Photoshop Tutorial by COLIN SMITH at:
http://www.photoshopcafe.com/tutorials/masking/masking.htm
Granny likes simple and easy
...


Grannysdc

Re: Selecting complex objects

Thanks R. The problem with that approach is that it would suck up tons
of time. As I mentioned, I've done pretty well with the magic wand,
which is quicker than a quickmask, but still looking to get a bit
quicker and sophisticated, if possible. Thanks again.


Als_trash@hotmail.com

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