Masking out Difficult Images in Photoshop
September 24, 2006 10:39 pm
Masking out Difficult Images in Photoshop
We will use Channels to help mask out complex objects with clean edges. This technique will also save you a lot of time and enable you to make precise cutouts.
It would be very difficult and time consuming to separate this image from its background because of the complexity and fine detail involved with the feathers on the lady’s headdress. This tutorial will focus on using Channels to help mask out complex objects with clean edges. This technique will also save you a lot of time. The initial goal is to separate the feathers from the pink background on the left side of the face, there are lots of places where tiny bits of pink are showing through the feathers
Make a duplicate layer of the image. This way the original is preserved on the background and we are working on a duplicated layer. Hide the background by clicking off its visibility icon. Choose Select>Color Range from the Menu. When the Color Range Dialog box open, choose the Left Eye Dropper tool and click on the background color in the image window (pink). You will see the selected color turn white in the dialog box. More the Fuzziness slider until the image is mostly black and the background is a clean as you can get it. Tip: To add a color to the selection click on the eyedropper tool with the plus sign and click in the image. Click ok
With the selection active, switch to the Channels palette. Click
the save selection as channel button, it’s the second one to
the left on the bottom of the channels palette. A new alpha channel
will now be visible. Press “Ctrl/Cmd+D” to Deselect and
click on Alpha 1 in the channels palette. The main window will now
turn black and white. The advantage of using a channel is the
ability to fine tune the selection without effecting the original
image. Black represents the areas that we want to keep and white,
the areas to be discarded.
Notice that there are areas of gray, these would be semi-transparent and need to become solid black and white (except for areas that should be semi transparent such as soft edges). There are tiny dots also visible, these will make for a very messy selection. Here is a quick solution that I have come up with: Click Image>Adjustments>Levels..
Time to fine tune the mask. Choose a black brush and make the edge hard. Paint over all the areas that belong in the object to mask out. Use a larger brush for large areas and a smaller brush for finer detail such as around the feathers. Use a white paint color to paint out the areas that should be removed.
Sometimes it can be hard to guess which part of the image belongs in the foreground and a peek at the original image is needed. Click on eye icon to the left of RGB at the top of the Channels palette (Fig 5). The original photo is now visible and the mask appears as a reddish color. Click the eye icon to go back to the mask view. The mask can also be hidden by toggling the eye (visibility icon). Keep going until you have a clean mask.
Hold Cmd(Ctrl PC) and click on the Alpha 1 thumbnail. You will now see an active selection. Click on RGB to see the color image. Open the layers palette. Select the working layer and press the Delete key (Backspace on Windows). The masked area of the backround will now be removed to reveal a nice clean masking effect. At this point In am only worried about removing the pink background on the left.
If there are areas that still need to be removed such as on the right side of this image, repeat the preceeding steps. Because each image is unique, some will need several passes and some can be done in a single pass. As you can see, this technique is very effective and the image can be dropped onto any background. Look at the top left of the image to see how precise the cut out is on the detailed feathers. Try that with the pen tool!
For more cool techniques like this on an easy to follow video format check out Photoshop Secrets For Digital Photographers photoshopCD.com
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Thank you for sharing your expertise. I have Photoshop 5.0LE on disc and I wondered if these effects that you refer to can be applied using that version? If the answer is yes, then I think it is about time I changed over from PSP. Best wishes, Dave