Make Perfect Selection for Human Object by Utilising Channel Mask Technique in Photoshop

Posted on July 5th, 2009 under Photo Effect, it has 28 Comments and 50,711 Views so far.

In this tutorial, I will show you a rather useful technique I use in Photoshop to make perfect human selection, which requires the combination of channel mask and the quick selection tool available in Photoshop CS3.

I have received a number of emails lately in regards to this topic and I have decided to post this short tutorial with a step-by-step guide for beginners. Once you master this skill, you can apply it to pretty much every human image you want to selection/extract.

Meanwhile, if you have any tips/tricks about making selections, you’re more than welcome to share your experience with us, just drop a comment below :)

Although this is not a formal photo effect tutorial but rather a tip/trick, I have created a final image here:

OK let’s get started!

To complete this tutorial, you will need to the following stock image:

Girl

Step 1

Load the Girl stock image into Photoshop. We know the ultimate goal is to seperate the girl from the rest of the image, but how do we start. Firstly let’s take a look at the image:

The overall lighting is quite good and it doesn’t have a lot of colour variation.
This is a human portrait so that means taking out the hairs and making selection around it will be difficult.
You may think of using Pen Tool, but what happen if you’re just not that good at it??

After those thoughts above, it’s time to get down to business. To begin with, let’s take a look at the channels in the channel palatte and select the “Blue” channel as shown below:

1 select channel

The reason I chose the “Blue” channel here is because it provide the biggest contrast from the model to the background, comparing with the Red and Green channel.

1 blue

Step 2

Now we’re are on the blue channel. The second thing we’re going to do is to increase the contrast as much as we can, while preserving the hair bits. To do this, we can make a duplication of the “Blue” Channel by right-click and choose “Duplicate channel”.

On the “Blue Copy” channel, go to Image > Adjustment > Brightness /Contrast and apply the following settings:

2 bc

Then hit Ctrl + L and bring up the level adjustments tool, apply the following settings:

2 level

and you will have the following effect:

2 after level

Step 3

Now we will have to use the power of the Quick Selection tool to select the light colour part of the girl’s body. To do this, simply grab the Quick Selection tool (W) from the tool box, set the brush size to 2px and tick “Auto-Enhance” option, make a selection of the white part as shown below:

3 quick sel

Hint: make use the + and – quick selection tool available on the option bar for adjustments, don’t worry about the hair bits on the outside as they’re already in black colour.

When you finish the selection, simply fill it with black colour:

3 after quick

De-select the image when you’re done, if you see a white gap on the girl body, simply use a black brush to fill it.

Step 4

Now you will see around the girl’s body (which is in Black), there are some areas cover in dark grey colour. We must get rid of them in order to make our selection better. To do this, simply use the Quick Selection Tool to make a selection around the girl, then press Ctrl + Shift + I and inverse this selection. Grab the Eraser Tool to gently erase those dark grey bits off:

4 eraser

The reason we make the selection is that by doing so, we will not accidentally erase the parts on the girl’s body.

Here is the effect so far:

4 eraser 2

Now we have successfully completed a Channel Mask, which we

Step 5

Now we can go back to the layer palatte, go to select > load selection and choose the following:

5 load sel

and you will see now the model is selected:

5 after load

Press Ctrl + J and make a duplication of the selection, and create a new layer in between and fill it with white colour, you will see we have now successfully make a pretty good selection for the girl model:

5 effect

Step 6

Now we can of course fine tune the image a bit by using the Sharpen Filter. Go to Filter > Sharpen > Smart Sharpen and apply the following settings:

6 sharpen

Also add a series of adjustment layers on top of it will help to bring out extra light and contrast: (Go to Layer > Adjustment Layer)

For all adjustment layers, make sure to tick the “Use previous layer as clipping mask” option.

Black and White:

6 bw

Levels

6 lv

Curves

6 curves

Hue and Saturation

6 hue

and here is the effect so far:

6 effect

Step 7

Now we have a perfect girl image, without any background and great to work on as a starting point. It’s time to use your imagination and creativity :) I simply use some custom brushsets from qbrushes.com and add some patterns in the background, adjusted the colour balance a bit.

That’s for this tutorial! Hope you enjoy it and find it useful, drop me a comment if you have any question, I will try my best to help you out.

Cheers and have a nice day!

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28 Comments

ricardofx Says:
thankx a lot @james; really thanx dude.
psaddict Says:
Awesome tutorial

Added to http://www.psaddict.com
Thu Hoai Says:
woa! wonderful! thanks very much
Nym Says:
thanx james. best channel mask tutorial on the web :)
James Says:
Thanks everyone, glad you all enjoy it!
Ryan Gliozzo Says:
nice tutorial. Learning this actually saves me from having to buy some stock photography for a project.
Thankyou!
Flex developer Says:
Hmm.. very interesting lesson. Thanks for job!
todo sobre el mundo de la actualidad informatica Says:
good input

todo sobre el mundo de la actualidad informatica
Robin Says:
Very nice tutorial – great detail!
cynthai Says:
This is a great tutorial. I was looking for something like this for some pictures I had.
Johnson Koh Says:
Interesting techniques! ;)
Emlak AVM Says:
Thx for detailed explanation.
worioh Says:
thanks very much
lots of details
SABOOR Says:
Realy very nice
Nathalie Says:
can i ask why is it black and white when i finished your step 6?! huhu
Kristin Says:
I try to fill the person black, but it does not work. I can just fill the outside.
santosh Says:
Boss the image which you are using for selection it had blurred background and the stock image are you giving us it has solid background which creates problem while following the step again on same image, so please replace the first image from stock

BTW trick is really coooooool
Thanks for that…. :)
Darren Says:
I was wondering if you had a way to do this for someone who doesn’t have CS3/CS4 quick selection is not in CS2 which is what I’m using. Thanks
Madz Says:
I like the tutorial but I also had a little problem. Like Nathalie’s, my picture turned black and white when I finished step 6. Did I do something wrong or forgot a step?
bids Says:
awesome!!!!!!!! this is, for me the best extraction technique i’ve tried so far! thanks man!!!!
emlak Says:
paylaşım içim teşekkürler
http://www.hitube.org Says:
o i like
Ashely Adams : Sticker Printing Says:
Hey James……..this is surely one of the best channel mask tutorials I’ve come across. I believe this will be helpful for both layman and professional designers. Keep posting.
image clipping Says:
Informative tutorial. Thanks!!
Henriko Says:
Very handy tutorial! Thanks for sharing ;-)
Amanda Says:
I’m having problems, and it’s really kind of frustrating haha. I got the quick selection tool step done, except I can’t, for some reason, select the triangle of background that her arm makes when she put her hand on her head? How can I select that section as well so it isn’t included with her in the next step?
Adan Says:
Im all good until step 6, my picture is black and white. not colorful. its colorful if i take the black and white off but its black and white. u need to explain urself better. Everyting is exactly as u said, ive done it over and over and still black and white.