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Cutting Blonde hair from busy background

Aug 2, 2012, 05:19
Post: #1
Cutting Blonde hair from busy background
Hi. Can someone please tell me if there is a method in GIMP that can be used for cutting out flowing "Blonde" hair from a Multicoloured background using the "Channels". It seems that it can be done using Photoshop, but there do not seem to be any tutorials around for GIMP. There are heaps for cutting out dark coloured hair from all sorts of backgrounds but nothing to cut out flowing blonde hair from a multicoloured background. Any help would be appreciated.
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Aug 5, 2012, 02:57
Post: #2
RE: Cutting Blonde hair from busy background
(Aug 2, 2012 06:53)ofnuts Wrote:  http://www.youtube.com/watch?v=AnbxtMCHKV0

http://www.gimpusers.com/tutorials/highpass-masking

Otherwise you can indeed use the channel-mixer to obtain a BW picture where the hairs stand out more on the background...

On the whole cutting hair on a really busy background is going to be long and difficult, and you may have to create several different masks depending on the background part you want to remove, and combine them in a global mask at the end.

Don't be fooled by the tutorials, they use pictures that make it look easy.

Thanks for the reply. I understand what you mean about the difficulty. I have had some success with dark hair subjects, but I have attached a picture of one like I am talking about. I would like to learn how to do it with this type of picture. This is why I was wondering if there was a tutorial that used the channels. As for making a global mask, I have tried doing that with a photoshop tutorial but although I made some progress, I never could work out how to make the global mask and go on from there.
Regards
Gary


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Dec 2, 2012, 06:06
Post: #3
RE: Cutting Blonde hair from busy background
Sorry to be a pain but i am still having problems with being able to do what you suggest here. I love using GIMP, but I must admit I am leaning towards Photoshop as the number of tutorials that I have viewed to do exactly what I want seem to abound using that program. I appreciate the feedback I have already had on this subject, but being a novice user, I cannot understand (believe me ...after many hour of trying), how to cut out a image of a girl with flowing hair with a busy background. I have attached another picture that I have been experimenting with . Is it possible to explain in more detail what I need to do to carry out the process using the "Channels" method? Are there any other help videos or sites that can be visited to assist my understanding on how to do this.
Many thanks for your help so far......
Gary


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Dec 2, 2012, 12:53
Post: #4
RE: Cutting Blonde hair from busy background
I would not go too much by PS tutorials, as Ofnuts has often said, they tend to be very specific to the image.

So here is a Gimp how-to which is very specific to the image, lol.

[Image: ed7Jj.jpg]

I use this method on maps which of course have fine detail which I want to preserve. Whichever way you use, the object is to get a black and white image that is used for a layer mask.

This is real time, nothing cut out. 6 minutes start to finish
http://youtu.be/N87VHCkbsts

** https://www.gimp-forum.net/ now answering questions**
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Dec 2, 2012, 14:41
Post: #5
RE: Cutting Blonde hair from busy background
Hi .. many thanks for the answer, I will have a look and give it a go. I love using GIMP but sometimes find it a bit frustrating looking for ways to do some of the things I would like to do like this. Many thanks again ... Gary
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Dec 2, 2012, 14:41
Post: #6
RE: Cutting Blonde hair from busy background
Hi .. many thanks for the answer, I will have a look and give it a go. I love using GIMP but sometimes find it a bit frustrating looking for ways to do some of the things I would like to do like this. Many thanks again ... Gary
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Dec 2, 2012, 17:06
Post: #7
RE: Cutting Blonde hair from busy background
Just wanted to say thanks to Rich for posting the video, it looks real useful. I had no idea about indexing or the colour map - I always use fuzzy select and the quick mask to remove busy backgrounds - this new way looks like a much better system and I'll try it out on my next photo manipulation. Cheers.

Gaza, you might have heard of this place already, but if not it's worth looking at as it offers links to many Gimp tutorials. http://www.xmarks.com/site/similar/1/wik...reated=all

[Image: DjIVv.png?1]

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Dec 3, 2012, 04:03
Post: #8
RE: Cutting Blonde hair from busy background
Thanks again for you help you folk. But .. I still have a problem. I followed the tutorial by every step (about 10 times now!!!) and for some reason when I change the image from RGB to 16 bit colour using the "Image" Mode, Indexed procedure, it not only changes the duplicate image which I have selected but it also changes the original image ( I do not have the locks switched on). So when I proceed to remove all the greens, I can see them being removed from both of the images (i.e. both the original and duplicate layers). So when I have made my mask and I copy and paste it, I end up with a 16bit colour image on the transparent layer. The interesting thing is though, that if I take a paint brush and choose the duplicate image layer and make a mark, the mark only appears on the duplicate. It does not make the change to the unselected layer. Maybe I have a selection in my setup which is wrong? Why it changes both the original AND the duplicate images I have no idea. Hopefully one of you kind people know what is happening and can put me out of my misery. Many thanks again for your help. …Gary
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Dec 3, 2012, 04:21
Post: #9
RE: Cutting Blonde hair from busy background
By the way .... I should have added that after I carried out the removal of the greens in the indexing process, I did not forget to select RGB again. Mind you I notice in the tutorial that when RGB is in fact selected again, the image does not change on the screen?
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Dec 3, 2012, 09:26
Post: #10
RE: Cutting Blonde hair from busy background
@ gazza

Just wondering if you duplicated the image (Image -> Duplicate) or just duplicated the layer.

IMHO best to work on a completely separate image. Whatever you do remember the objective is to produce an image that can be used as a mask.

For that girl1 image, with well defined areas of colour reducing the number of colours can work, but you use whatever is necessary to get that mask. Use / combine several methods if required, use applications other than Gimp if required. I sometimes use Inkscape, sometimes use a little scientific app called ImageJ.

Once you have that mask then you can apply it to the original image via a layer mask. I always put everything back to RGB, Indexed images such as .gif are stuck to 256 colours max.

Another thing about a layer mask, you can paint in some other colours than black and white to get intermediate transparency, sometimes useful for feathering-in.

Keep experimenting, there is always something new to learn.

** https://www.gimp-forum.net/ now answering questions**
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Dec 3, 2012, 14:33
Post: #11
RE: Cutting Blonde hair from busy background
Thanks again for your help. I "really" appreciate. I will give your suggestions a go ...cheers..
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