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Selecting out materials and moving to the base image.

For a digital imagery project, one of the most commonly used selection methods will be the Magnetic Lasso located under the Lasso tool. Open up source images 1 and 2 of two different evergreen trees. Resize the image and resolution as in the above exercise (Image--Image Size and set size = 10"x 7.5" and resolution = 200), both of which will reduce the file size.

Magnetic Lasso

The Magnetic Lasso reads the difference between pixel colors. Minimize Source 2 image and zoom into Source 1. Activate the Magnetic Lasso hidden under the Lasso tool. Start by selecting along the edge of the evergreen and keep dragging along the edge of it until you loop back around to the beginning point (or double-click to end your selection).

Starting Your Selection Over

End your selection by double-clicking; then start your selection over or go to Select--Deselect, right-click and go to Deselect, or hold Control+D to start completely over.

Adding to Your Selection

To add to your selection hold the Shift key while selecting out the area to add. In the options bar you can also set the option to Add to Selection as seen in figure 46.


Deleting Part of Your Selection

To delete part of your selection hold the ALT key while selecting the area to take out. In the options bar you can also set the option to Subtract from Selection.

You can also use these tips with any of the other selection tools to add or delete areas of your selection. Making a good clean initial selection is critical for obtaining a seamless final project and for creating a great resource library of materials.

Freehand Lasso

For more selection detail, zoom into the edge of the tree and use the Freehand Lasso to add to the selection. Add to the selection by using the Shift key or setting the options bar to Add to Selection. This will help with getting a more natural branching structure that was perhaps cut off by the Magnetic Lasso.

Saving and Loading Your Selection

Once your selection is finished, you can save it within this image so that it can be used for other projects without you spending time in making that good clean selection all over again.

   Go to Select--Save Selection--Name and give it a name.

   To reload it as a selection later, go to Select--Load Selection and
   select the name you gave it. When you save this image as a .psd or
   Photoshop file, the selection you created and saved will also be

Moving the Source Image to the Base Image

Select the Move tool and then click and drag the tree to the base image. You will see the frame of the base image become highlighted. Release the tree and notice that it has been put on its own layer.

Working with Layers

In the Layers palette, double-click on Layer 1 and rename it Tree 1 (figure 4-7).


Flipping the Source Image

Because the base image has a slight shadow cast to the right, we will flip this tree so that it appears to have that sun angle. Activate the Tree 1 layer by selecting it in the Layers palette. Go to Edit, then Transform and select Flip Horizontal.

By Professor Ashley Calabria

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Title Annotation:CHAPTER 4: Photoshop Imaging
Author:Calabria, Ashley
Publication:Computer Graphics for Landscape Architects, An Introduction
Geographic Code:1USA
Date:Jan 1, 2009
Previous Article:Setting up the drawing: resize images using dpi and Overall Size.
Next Article:Sizing and arranging the source images.

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