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Selecting layers from a flattened image


S

strawb

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Untitled-1.jpg

Guys

I'm new here, so hello! I would like to know what the name of the tool/technique is to highlight the green area of the above image. I presume I would use some sort of channel filter or something. Don't worry about the full details of how to do it, just the name of the tools/technique.

My aim is to be able to put the image on a different colour background. I am using CS5.

Strawb.
 
Ok thanks Vafann,

I just thought there would be a way to do it without having to tweak thresholds and individually select the different sections.

I will get the wand out.

Cheers John.
 
strawb said:
Ok thanks Vafann,

I just thought there would be a way to do it without having to tweak thresholds and individually select the different sections.

I will get the wand out.

Cheers John.
Click to expand...

Hi again John :). Maybe the wand wasen´t the best choice, I tired and this was the best I could get out of it, I suppose it get more detailed if it was multiplied some more, but I duplicated the layer 3 times, and multiplied them, but still this wasen´t very good. I really don´t know what to do instead, I hope someone else knows better. :)


tree-wand.jpg
 
For that kinda image can use same methods as for hair extraction.

tree.jpgtree-grey.jpg

1. Make background layer dublicate.
2. With Curves set white point to outside tree and make lot darker tree (adjust that in RGB chanell still in Curves panel).
3. Add Layer Adjustment Layers Black & White and merge it with that dublicated/contrasted layer.
4. Make that greyish layer copy and set blending mode to Multiply.
5. CTRL+click on RGB in Channels panel.
6. Invert selection. Or fill with background you want.
7. If you inverted selection then make original background copy and use selection as mask (or just press CTRL+J).


P.S. Vafann, light grey just isn't best option for background for this image.
 
SeniorS said:
For that kinda image can use same methods as for hair extraction.

View attachment 8737View attachment 8738

1. Make background layer dublicate.
2. With Curves set white point to outside tree and make lot darker tree (adjust that in RGB chanell still in Curves panel).
3. Add Layer Adjustment Layers Black & White and merge it with that dublicated/contrasted layer.
4. Make that greyish layer copy and set blending mode to Multiply.
5. CTRL+click on RGB in Channels panel.
6. Invert selection. Or fill with background you want.
7. If you inverted selection then make original background copy and use selection as mask (or just press CTRL+J).


P.S. Vafann, light grey just isn't best option for background for this image.
Click to expand...
Lol! I know Senior S! It was white, but it turned grey when I was multiplying it, it was a lot harder than I thought. :)
 
That's happened because background wasn't white. If you talking about hair extraction tutorial where cliping mask used then there was white background (little cheating :)).
So before multiply you should make background total white (or very close to white) on dublicated layer of course.
And try not overlight main image as the same time. Tricky sometimes but for this one Curves is best option.
 
SeniorS said:
That's happened because background wasn't white. If you talking about hair extraction tutorial where cliping mask used then there was white background (little cheating :)).
So before multiply you should make background total white (or very close to white) on dublicated layer of course.
And try not overlight main image as the same time. Tricky sometimes but for this one Curves is best option.
Click to expand...

No, I put it on a new white background layer, I don´t know why it turned grey lol. :)
 
I don't know what method you use.
I was talking about making that mask. If you use channel kinda selection then in this picture it isn't 0 white, it have light small but color. And muliplay makes it only darker and darker.
Look at your mask. I bet it isn't white tree on black background but light tree on greyish background.
 
Thanks for your help guys.

I sound like I know what i'm talking about Paul, but alas, I do not. However I couldn't quite get to grips with the method to remove it from the rasterized image.

After you said it was similar to hair extraction. I remember reading about that a while back and ended up using the Filter > Extract... tool and it worked a dream. Thanks for steering me in the right direction.

I'll stick around and see if I can help others out with my limited knowledge.

John.
 
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