In this Photoshop tutorial I’ll show you how you can extract a subject from an image using selection techniques. These selection techniques can help you to even extract out a single piece of details. Basically, I’ll introduce three extraction techniques for selection and it doesn’t matter whether you are beginner or advanced level of Photoshop user, this tutorial will surely help you.
First Technique : Using Quick Selection Tools
First technique is very simple and most of us using this techniques in our work flow using quick selection Tools like, Quick Selection Tool (W), Magical Wand Tool (W) and Polygon Lasso Tool (L).
Let’s make the selection with first technique. I have this landscape image open in Photoshop. Now I want to make the selection of sky parts of the landscape. To do this, just activate the Quick Selection Tool (W) and drag it over the sky parts of landscape.
Here we’ve selected sky parts of the landscape. It’s a pretty much simple technique and works best when we have a solid background as we’ve in the landscape.
Now just add a Layer Mask to landscape layer and boom!. The sky part is gone. Very clean and decent selection.
Why we can’t use Magic Wand Tool (W)? Since Magic Wand Tool (W) works based on color samples so it will only make the selection of color area which it samples from the background. If you click, with this tool, on the blue parts then only the blue color pixels will be selected not the rest. You can see the below image that I’ve clicked on the blue part (top left corner) as a result only those parts, having blue color pixels, is selected.
That’s why we are not using it. Similarly, rest of the tools such as Polygon Lasso Tool, Rectangle Tool, Elliptical Marquee Tool has limitation. Try them and see why they are not suitable to use when we’ve large solid background area for selection.
Second Technique: Selecting Parts and Removing Objects from an Image
Second selection technique used when we need to select the portion of an image which we want like selecting model from its background, making the selection of an object and any particular area. In this techniques we use Pen Tool (P) and which is very useful in order to make selections. Let’s say we want to extract the model from its background. Activate the Pen Tool (P). Set it Mode to Path on the option bar.
Now start making a model selection by placing first anchor point on the model. Now I just have a starting point for my path. To create a path around the model I’ll have to go around the model adding an anchor point in each part of the model body where the path needs to change direction. Once you’ve gone through entire model parts, then simply click on the starting anchor point to close the path. We all are human and mistake do happen while making the selection. With Pen Tool (P), you can easily go back to your previous anchor point without losing the entire path. To go back, simply press CTRL + Z .
You cannot go back to previous point while making selection using Polygon Lasso Tool and this is the reason that you should use Pen Tool (P). That is why Pen Tool (P) is best. Now while our path is selected, right click on anywhere in the document and then choose make selection.
Now click on the add layer mask icon at bottom of layer panel to extract the model.
Always zoom in while making selection using Pen Tool (P). Initially, Pen Tool (P) looks complicate to understand and really very difficult to use if you are beginner. But once you know how to use it then it is the best selection tools available in Photoshop.
Third Technique : Making Advanced Selections
With this technique you can make the more complex selections. In this techniques we’ll use the combination of Channels and Calculations to make the selections. Open up the tree image in Photoshop and I want make the selection of tree.
Let’s make the selection with Magic Wand Tool (W). With this you’ve to click on the blue sky parts between the branches of tree to make the selection. This is time consuming and it’s not appropriate to click over and over again to sample the color for selection.
We can’t use the Quick Selection Tool (W) as well because we don’t have solid background for selection. However, if you use then it can also ruin the selection.
What about Pen Tool (P)? It is more time consuming than last one. With this tool, we’ve to go around the entire tree in order to make selection. I don’t think it’s a good idea and it will take hours to make the selection.
To overcome these limitations, we’ll use Channel Techniques. First switch to Channel group at bottom of layer panel. If channel is not showing on layer panel then go to Window > Channel to show the tab of channels. Under the Channel group you’ll find the three channel named Red, Blue and Green.