Editing a quick mask
Next, you will refine the selection of the egret by adding to or erasing parts of the masked area. You'll use the Brush tool to make changes to your quick mask. The advantage of editing your selection as a mask is that you can use almost any tool or filter to modify the mask. (You can even use selection tools.) In Quick Mask mode, you do all of your editing in the image window.In Quick Mask mode, Photoshop automatically defaults to Grayscale mode. The foreground color defaults to black, and the background color defaults to white. When using a painting or editing tool in Quick Mask mode, keep these principles in mind:Painting with white erases the mask (the red overlay) and increases the selected area.Painting with black adds to the mask (the red overlay) and decreases the selected area.
Adding to a selection by erasing masked areas
You'll begin by painting with white to increase the selected area within the egret. This erases some of the mask.
| 1. | To make the foreground color white, click the Switch Foreground and Background Colors icon ( ) above the foreground and background color-selection boxes. | | 2. | Select the Zoom tool( ) and magnify your view of the image, if needed.
TOOL TIPS FROM THE PHOTOSHOP EVANGELIST
Julieanne Kost is an official Adobe Photoshop evangelist. Zoom tool shortcutsOften when you are editing an image, you'll need to zoom in to work on a detail and then zoom out again to see the changes in context. Here are several keyboard shortcuts that make the zooming even faster and easier to do.Press Ctrl-spacebar (Windows) or Command-spacebar (Mac OS) to temporarily select the Zoom In tool from the keyboard. When you finish zooming, release the keys to return to the tool you were previously using.Press Alt-spacebar (Windows) or Option-spacebar (Mac OS) to temporarily select the Zoom Out tool from the keyboard. When you finish zooming, release the keys to return to the tool you were using.In the toolbox, double-click the Zoom tool to return the image to 100% view.Hold down Alt (Windows) or Option (Mac OS) to change the Zoom In tool to the Zoom Out tool, and click the area of the image you want to reduce. Each Alt/Option-click reduces the image by the next preset increment.With any tool selected, press Ctrl-+ (Windows) or Command-+ (Mac OS) to zoom in, or press Ctrl- or Command- to zoom out. |
| | 3. | Select the Brush tool ( ). | | 4. | On the tool options bar, make sure that the mode is Normal. Then, click the arrow to display the Brushes pop-up palette, and select a medium-sized brush, such as one with a diameter of 13 pixels. Click off the palette to close it.NoteYou'll switch brushes several times during this lesson. For convenience, you can drag the Brushes palette from the palette well (on the right side of the tool options bar) so that it stays open, making your brush choices readily available.  | | 5. | Using the Brush tool, begin painting over the red areas within the egret's body.Although you are painting with white, what you see in the image window is the erasure of the red mask areas.Don't worry if you paint outside the outline of the egret's body. You'll have a chance to make adjustments later by masking areas of the image as needed.Unedited mask Painting with white Result | | 6. | Continue painting with white to erase all of the mask (red) in the egret, including its beak and legs. As you work, you can easily switch between Quick Mask mode and Standard mode to see how painting in the mask alters the selected area. In Standard mode, notice that the selection border increases to encompass more of the egret's body.Standard mode Edited mask in Standard mode Quick Mask selection If any areas within the body of the egret still appear to be selected, it means that you haven't erased all of the mask.Selection in Standard mode Erasing in Quick Mask mode | | 7. | Once you've erased all of the red areas within the egret, click the Standard Mode button ( ) again to view the quick mask as a selection. |
Subtracting from a selection by adding masked areas
You may have erased the mask beyond the edges of the egret. This means that part of the background is included in the selection. You'll fix these flaws by returning to Quick Mask mode and restoring the mask to those edge areas by painting with black.
| 1. | Click the Quick Mask Mode button ( ) to return to Quick Mask mode. | | 2. | To make the foreground color black, click the Switch Foreground and Background Colors icon () in the toolbox so that the black color swatch appears on top. Remember that in the image window, painting with black will add to the red overlay. | | 3. | Choose a small brush, such as 1, 3, or 5 pixels, from the Brushes pop-up palette. | | 4. | Paint with black to restore the mask (the red overlay) to any of the background area that is still unprotected. Continue working until only the area inside the egret remains unmasked and you are completely satisfied with your mask selection.Remember that you can zoom in and out as you work. You can also switch back and forth between Standard mode and Quick Mask mode.NoteIn Quick Mask mode, you can also use the Eraser tool to remove any excess selection.Painting with black to restore mask | | 5. | In the toolbox, switch to Standard mode to view your final egret selection. | | 6. | Double-click the Hand tool ( ) to make the egret image fit in the window. |
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