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Intricate Selections with low contrast

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  #11  
Old 09-20-2008, 03:53 PM
ktg222 ktg222 is offline
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Re: Intricate Selections with low contrast

I used a modified version of Russell Brown's tutorial to make a mask of the building on a background copy layer. I put a blue sky layer below the background copy layer and used Blend If to bring back in the clouds. I reduced he opacity of the blue layer to make it less intense.
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  #12  
Old 09-20-2008, 04:03 PM
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Daviskw Daviskw is offline
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Re: Intricate Selections with low contrast

Hi there

I used a pen selection all except the antennae...There I applied image to the red layer and used multiply. Added part of a new sky then played a little...great image

Butch
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  #13  
Old 09-20-2008, 09:32 PM
bestremera bestremera is offline
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Re: Intricate Selections with low contrast

You guys are Amazing!
What I don't know about selections . . . .
How do you start with one method of selection then add another different method.
I only know how to start and finish with one method

Thanks some more, Bob
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  #14  
Old 09-20-2008, 10:16 PM
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cricket1961 cricket1961 is offline
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Re: Intricate Selections with low contrast

I can't resist a good calculations challenge!

Hard to tell because of the jpg compression, but try these settings and probably adjust from there.

Chris
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  #15  
Old 09-21-2008, 06:57 AM
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Swampy Swampy is offline
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Re: Intricate Selections with low contrast

Bob, Thank you. Glad you liked the tutorial. :-)

You can start a selection with one method and use that selection to create a mask. Then, with the mask selected, you can continue using other selection tools fill each newly created selection, on the mask, with the appropriate mask color (black or white).

For example, let's say the subject is a car. I'll use the marquee tool to basically select the area of the car, and create the mask with that selection. This just removes the gross background areas. Then I'll use the pen tool and select more detail around the car and add that to the mask by filling each new selection with black (on the mask). I just keep cutting away more and more of the background this way until all the background is hidden.
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  #16  
Old 09-21-2008, 12:55 PM
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Markzebra Markzebra is offline
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Re: Intricate Selections with low contrast

Chris is obviously a bit of an expert with the Calculations - try his method, and then use dodge and burn brushes to modify the mask, these can be set up with low opacity color dodge and burn mode brushes, or directly with the burn or dodge tools

Personally I would have probably done the whole thing with the pen tool, although the method above may in practice be better. Nice shot.
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  #17  
Old 09-21-2008, 01:14 PM
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lurch lurch is offline
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Re: Intricate Selections with low contrast

Chris: Many thanks for providing a bit of insight into thinking about calculations - it made this one easy. Penned the building bottom, used overlay paintbrush on building top and sky, touched up layer mask with normal paintbrush in black or white as appropriate. Since this was an extraction exercise I just replaced the sky with solid color.

Bestremera: Great shot!
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  #18  
Old 09-21-2008, 05:11 PM
bestremera bestremera is offline
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Re: Intricate Selections with low contrast

Thanks Swampy and everybody,
I'm not going to stop until I get this selection/mask thing licked.
Bob
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  #19  
Old 09-29-2008, 08:56 AM
musicman_bmh musicman_bmh is offline
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Re: Intricate Selections with low contrast

chris,
how are you getting the correct numbers to put in for the calculations? And are you inverting the channels before you open calculations?
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  #20  
Old 09-29-2008, 04:22 PM
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Re: Intricate Selections with low contrast

Just another way of doing things, in the interest of offering options.

A technique I have found that works well with a lot of straight edges like you have in this picture, sounds involved, but it takes longer to describe than to do.

Duplicate the base layer, create a level adjustment mask by clicking the layer icon at the bottom of the layers pallette (it looks like a yin/yang thing) adjust levels until there is a clear separation between the building and the sky (Building will be dark, sky light in this example).

Merge the level adjustment layer into the second layer. Draw a simple square or circular marquee around the spire and copy the section onto a third layer.

Hide layers 1 and 2.

Then, zoom way in and, using the color picker (Select>Color Range) pick out the sky colors in the little "windows" in the spire. Remember,you can choose multiple colors or levels of color by choosing the dropper with the + next to it. Once you click OK, all the colors you chose will be highlighted.

Invert the selection and copy it to a new layer. You now have 4 layers. Hide layer 3.

Select the 4th layer subject by holding down CTRL and clicking on the layer icon. Now select the base layer again, and , right click within the marquee, copy the selection to a new layer.

You can then use the polygon marquee tool to select the rest of the building as normal and copy it to a new layer. Once you have that done, just merge the clean spire with the clean cutout of the building.

Now you can do whatever you want with the rest (adjust for the sky etc) or you can choose the new building cutout, invert and copy the sky to a layer to work in it alone.

See the link for a screen shot of my layers pallette.
http://i49.photobucket.com/albums/f2...ups/Picker.jpg

Hope that all makes sense!~
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