Instead, I decided on a stock image which seemed manageable to remove the background easily enough… Or so I thought at the time. My plan was to use the Pen Tool to create a Mask and remove it from the background. I realized quickly (well, actually not that quickly) that this particular item was way too complicated for the Pen Tool treatment.

Here's the Tree Stock Image I started with.

All I wanted was the tree; the sky and ground had to go, including the sky behind the tiny little branches. Now, because this was for a printed poster, the image is large, and has to be very detailed even when viewed close, so there wasn’t much room to fudge the details; I needed to remove the sky from behind each and every branch…

My first attempt was to use the Pen Tool and try to mask out the tree. But after 3 hours of work, this is all I had done…

Cellphone photo of Tree Mask using Pen Tool.

This was just ridiculous, at this rate I would have been masking out this tree for 6-7 hours and been less-than-satisfied with the final result; because of this, I gave up immediately on this method (scratch 3 hours from my life… but better to save the rest than continue on with a poor method).

I ended up using Channels to do the task, and it turned out better than I thought it ever would!

How to use Channels in Photoshop:

I’m using Photoshop CS3 to explain this, but the method is very similar across the entire CS – CS5 tree (no pun intended).

Step One:

With an image (preferably the one you are trying to remove an object on) opened in Photoshop, choose Window – > Channels if it’s not already open. By default, the panel is tied in with the Layers panel.

Click on Window -> Channels to open Chennel Menu

Step Two:

Find which Channel gives the most contrast between the foreground and the background by clicking on each one Red, Green and Blue one at a time; the more contrast there is, the better your results. In my case, Blue turned out to have the most contrast.

Find the Channel which offers the most contrast

Step Three:

Using the Magic Wand Tool with a tolerance of 50 I clicked on the tree. The tolerance settings may need to be adjusted depending on your image, however this worked well for me. It did though also pick up the ground:

Select the Tree using the Magic Wand Tool with a 50 Tolerance

I simply used the Rectangle Marquee Tool to unselect the ground, leaving the tree the only selected object.

Step Four:

Head over to the Layers Panel by Clicking on Window -> Layers. You will see the image has returned to full color, yet the tree is still selected. Then it’s just a quick click of the Mask icon in the Layers Panel.

Click on Layers Panel and your object, in full-color is now selected.

Click the Mask Icon and watch the background disappear

That’s it! 5 minutes of work beats hours and hours every time!

I was then able to use the tree in my final composition, and the space between branches showed the design elements behind it!

Final Composition

]]> http://www.orkron.com/using-channels-in-photoshop-to-remove-backgrounds/feed 3 http://www.orkron.com/stock-photo-freebie-logitech-mouse http://www.orkron.com/stock-photo-freebie-logitech-mouse#comments Wed, 02 Dec 2009 21:56:36 +0000 Orkron http://www.orkron.com/?p=1002 I’ve been playing around, taking pictures of objects and I like the look of this Logitech Wireless mouse.

I decided to give away the full-resolution image as a Stock Photo for you to use.

The photo is 2329 x 1814 at 180 dpi (roughly 13 in wide x 10 in tall)

Download: Logitech_Stock_Photo (316) (985 KB ZIP)

I have these available in high-res, in ZIP format – just after the jump.

Download: tulip_01 (ZIP 1.87 MB)
Download: tulip_02 (ZIP 3.47 MB)
Download: tulip_03 (ZIP 1.95 MB)