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Photo Compositing Collage, montage, masking, selections, combining, etc.

Complex hair selection

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  #21  
Old 01-19-2006, 01:06 AM
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bart_hickman bart_hickman is offline
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The best way I've found for dealing with color cast like this is to use a channel mixer (set to monochrome) to create a mask that selects the area of color--turn up the blue and turn down the green and red). This makes an image (alpha-channel-to-be) that is black everywhere except where the blue is. The stronger the blue, the brighter it is.

Take this image and paste it into ANOTHER channel mixer (effectively masking its effects and constraining it to the blue fringe area.). The levels on this second channel mixer will turn down blue and slightly green, leave red the same.

This effectively replaces meok's step 4 while maintaining the interactivity of a channel adjust layer and avoiding hand-brushing.

I attached the last three steps--1. blue fringe, 2. masked channel mixer layer, 3. blue removed with masked channel mixer. Hair colors are unaffected.

PS--oh yes, and just like everybody else, I'm dying to see what Flora did too.

Bart
Attached Images
File Type: jpg blue.jpg (28.7 KB, 79 views)
File Type: jpg masked_channel_mixer.jpg (23.0 KB, 112 views)
File Type: jpg blue_gone.jpg (27.8 KB, 117 views)
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  #22  
Old 01-19-2006, 07:55 AM
superfrasky superfrasky is offline
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Thanks all by suggestions, very useful....really THANKS!!
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  #23  
Old 01-19-2006, 03:42 PM
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I also found a way to get there without a mask.
1. Convert the image to LAB
2. Add ablank layer on top
3. Fill the blank layer with solid black
4. Double - click that black layer to bring up the Layer Styles control panel
5. Go to the Blend If pull down box and select the B channel
6. Drag the highlight triangle (white) on the bottom layer from the far right to the center. When you get to the center Alt + Click the triangle to split it and the slowly drag the left half of it to the left (toward blue) until all of the whispy hair gets captured but the blue background is still supressed. Click OK
7. Flatten the image (you are still in LAB color).
8 Ctrl M to bring up the Curves control panel. Lock down the Yellow portion of the slope with at least 3 pts from the centre to the top so that the top half will not move when you do what comes next.
9. Take the lower half of the curve and flatten it completely so that it is lying flat on the X axis.
The results seem to be more fine and more accurate in capturing all the whispy hair than any of the other methods I have tried.
Regards, Murray
Attached Images
File Type: jpg Hair Rev MM Blend If Final Thumb.jpg (95.3 KB, 78 views)
File Type: jpg Hair MM Blend If Screen Shot.jpg (92.0 KB, 118 views)
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  #24  
Old 01-19-2006, 06:45 PM
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byRo byRo is offline
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Murray, that's a very neat method.

Just throwing in another quickie here, using the fact that this is a ChromaKey background......

- Click the eye-dropper on the background;
- Make a new solid colour layer (will be in the background colour);
- Set mode to difference;
- Inspect the result to find a good combination of channels for a mask (Red is good here)

etc.....

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  #25  
Old 01-19-2006, 08:47 PM
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Ro, thanks. Afterward I found that by pulling the right half of the split triangle back toward the yellow side I was able to define catch effectively all of the whispy edge hairs as they are in the original. BTW, your last technique is neat as well.
Best Regards, Murray
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  #26  
Old 01-20-2006, 12:00 AM
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Flora Flora is offline
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Simply Hue/Saturation...

Hi everybody,

superfrasky,

you are welcome! ... Glad we could be of help ...

Murray,

great technique! .... I had actually written a Tutorial on a very similar selection method: Using "Blend If" for Selections and Selective Corrections. ... but never thought of adding a solid black Layer on top ... I have to try it.

Rô,

simple, fast ... great!!! Thank you!!

____________________________________

.... and here is my 'maskless' selection:

In spite of curls and flyaway hair, this picture is quite 'easy' to mask because of its clean contrast between subject and the strong flat colour background ...

After going through one of the conventional routines for masking, as I had done in my first post on this Thread, I simply tried to act directly on the 'colour side' of it ... meaning, I tweaked the background and 'halo' colours directly....

* I opened a Hue/Saturation Adjustment Layer and moved the 'Master' Saturation slider to 100% just to check what colours were where....and realized that background and 'halo' were made by Blues and Cyans ... (Attachment 1).

* ... so ... still working on my Hue/Saturation Adjustment Layer, I moved the 'Master' Saturation slider back to 0, went to the Blues and Cyans and tweaked them as in Attachments 2 and 3

* Attachment 4 shows the result I got with just a simple Hue/Saturation Adjustment Layer .... all curls and even the finest flyaway hairs are intact but cleaned from the bluish 'halo'.

After trying this on this particular picture, I've tried it on other similar images ... needless to say, it works best when the colour contrast is as strong as here or nearly so.
Attached Images
File Type: jpg SNAP-0070a.jpg (91.7 KB, 106 views)
File Type: jpg SNAP-0071a.jpg (78.4 KB, 129 views)
File Type: jpg SNAP-0081a.jpg (78.4 KB, 119 views)
File Type: jpg SNAP-0082.jpg (86.9 KB, 137 views)
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  #27  
Old 01-20-2006, 03:03 AM
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Flora Flora is offline
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.... some more examples of Hue/Saturation background change ....
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File Type: jpg SNAP-0081.jpg (98.4 KB, 124 views)
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  #28  
Old 01-20-2006, 07:59 AM
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Flora, Brilliant!
It is amazing how we often first approach tasks with a complex solution in mind when in fact there is a more elegant solution based on a fundamental concept that gets lost in all of the possible complexities. Thanks you for the additional enlightenment.
Best Regards,
Murray
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  #29  
Old 01-20-2006, 09:05 AM
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Gary Richardson Gary Richardson is offline
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Gotta agree with Murray, thanks for the breakdown Flora, an education as always.
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  #30  
Old 01-20-2006, 03:06 PM
Ken45140 Ken45140 is offline
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Bart: may I ask for a little more help with the method you posted above? You listed the last 3 steps but I must need help with all the rest because I do not wind up with what you show, no matter what variations I have tried.

From your attachments, I seem to get the ColorMixer layer but I can not get the mask layer (that is below the CM layer) to look like yours. I could list my steps but am sure they are wrong or in the wrong order.

Can you elaborate or ask me what I should post to let you help me?

Thanks,

Ken
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