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To make a selection, press the appropriate button, then click and
drag your cursor on the image.
The Selection Wand is probably the most useful Masking tool.
To use it, select it, establish a tolerance, and click on a specific
colored pixel on the image. Tolerance simply means that + or – of
a certain range from the color will be selected.
For instance, if you have a tolerance of 20 and you select the
background, all the colors in the background that are the same
color or within a tolerance of 20 from the color you clicked on will
be selected.
Once a selection has been made, it can be added to or subtracted
from the initial selection.
To add to the selection, click + in the Region Add / Subtract
area or hold down the Ctrl key and click on the image to make
more selections.
To subtract from a selection, click - in the Region Add /
Subtract area or hold down the Alt key and click specific areas
on the images.
This tool is used to Expand, Contract or Smooth an existing
selection. This can be very useful when there is not enough
color difference between the background and the product
(ie a white product on a white background).
While the item is selected, click Modify and select Expand.
This will make the selection expand into the white on the
flashlight by one or two pixels. Finally, press the Delete key
to replace the background with pure white (if pure white R =
255, G = 255, B = 255 was selected).
Sometimes smoothing the image is necessary. The Smooth
feature allows you to smooth the edges of the selected area.
Pressing Modify Selection then selecting Smooth will
make the following interface appear:
Amount determines the amount of smoothing.
Threshold is similar to tolerance and is related to pixel
selection. The lower the number the better the threshold.
You may need to smooth a selection more than once to get
the best results.
• Masking
Sometimes you may need to mask the picture with the selection tools or with the magic wand.
Selection
tools
Magic
wand
Modify
Chapter 5 : Retouching images