5: Using Selections and Masks in Objective-C

Paint QR Code in Objective-C 5: Using Selections and Masks

5: Using Selections and Masks
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First, use the Marquee tool to draw a rectangular selection around the eagle s head
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Next, use the Magic Wand tool to remove the green background from the selection
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Photoshop 7: Tips & Techniques
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If you have trouble removing all of the green background at once, undo your operation (Edit | Undo) and make sure your Tolerance is set to 32 in the Options bar at the top of the screen for the Magic Wand tool To make the edges of your selection smooth, place a check mark in the box next to Anti-aliased
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Use the Magic Eraser to Remove Areas of Color with a Single Click
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Oftentimes, a designer needs to quickly remove an area of color from an image Previously, this may have involved countless hours of erasing with the normal eraser, or drawing selections An easier way to quickly remove an area of color is to use the Magic Eraser tool To quickly remove an area of color from an image, such as the green background from the Eaglepsd file in the Photoshop 7 Samples folder, click and hold on the Eraser tool in the toolbox to reveal two additional eraser tools The tool at the bottom of the menu is the Magic Eraser, which is also accessible on your keyboard by pressing SHIFT-E (You may have to press SHIFT-E several times until you cycle through the other eraser tools and reach the Magic Eraser) To use the Magic Eraser, click once anywhere within the green background QUICK TIP or on whichever color range you wish to remove Photoshop automatically removes Want to get rid of that green fringe around the the color from those pixels, leaving them edge of the eagle that s left over from the transparent (as shown in Figure 5-6 by the background See the next tip, Remove Fringe gray blocks behind the eagle) Areas to Clean up Selections You can edit the range of colors removed by increasing or decreasing the Tolerance in the Options bar; the higher the number, the wider the range of colors removed For smooth edges, place a check mark in the box next to Anti-aliased To restrict Photoshop to removing only pixels in the color range that are touching the one you click, place a check mark in the box labeled Contiguous To reduce the opacity of the color range instead of removing it altogether, change the Opacity setting in the Options bar
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Remove Fringe Areas to Clean Up Selections
It is common that when you move or copy an irregularly shaped selection particularly one with anti-aliased or soft edges a few pixels tag along from outside the selection area For example, when I used the Magic Eraser tool to quickly remove the green background from the Eaglepsd file found in the Photoshop 7 Samples folder in the previous tip, a few green pixels were stuck around the eagle s
5: Using Selections and Masks
Figure 5-6
The Magic Eraser enables you to delete areas of color with a single click
white head (refer to Figure 5-6) The Defringe command in Photoshop makes it easy to clean up selections like this one To clean up selections that have leftover pixels of unwanted color often called a halo around the outside edge of a selection, first make sure the selection is on its own layer in Photoshop For example, if you used the Magic Eraser to remove the green background from the Eaglepsd file in the previous tip, you are left with the eagle itself on Layer 1 Then, choose Layer | Matting | Defringe and specify the amount of solid color pixels to remove from the edge of the layer If you re unsure, it s best to try 1 pixel first, because you can always perform the action again to remove additional pixels of color
Use the Single Row and Single Column Marquee Tools to Create Quick Borders
Two versions of the Marquee tool the Single Row Marquee and Single Column Marquee are rarely used by most designers However, these two tools can be particularly useful to web designers who need to create quick single-pixel borders
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