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| The only file formats that support all of the Photoshop features are PSD and TIFF. |
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| Making multiple copies of an original file is useful if you want to make and save several different versions of a layout. |
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| The SHIFT+T keyboard shortcut allows you to toggle from the Rectangle Marquee tool to the Elliptical Marquee tool, and vice versa. |
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| The Tool Preset Picker button displays on most options bars. |
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| To activate the Subtract from selection button, you can click it on the options bar, or hold down the ALT key while dragging. |
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| The Feather box is useful for selecting the extra corners of an L-shaped object or for shapes that do not fit within a single rectangle or ellipsis. |
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| The Refine Edge button allows you to specify exact pixel values for a marquee’s height and width. |
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| When drawing a marquee, if you want to start over, you can click somewhere else in the document window to deselect the marquee. |
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| When you drag a newly defined marquee, the image inside the marquee moves along with the marquee. |
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| Once a selection is made, you can at that point add anti-aliasing. |
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| While moving a copy, the mouse pointer changes to a black arrow with a white arrow behind it. |
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| When you first begin to drag with the Move tool, the mouse pointer changes to an arrow with a knife indicating a cut from the original position. |
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| Photoshop layers portions of images when you move them. |
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| Close tracing while creating selections, and careful placement of moved selections, will prevent unwanted layering. |
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| The align and distribute buttons help position selections when more than one layer is selected. |
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| To choose a transformation command, you can click Transform Selection on the shortcut menu that is displayed when you right-click the selection. |
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| In Photoshop, unlike in other applications, you cannot use the Cut, Copy, and Paste commands from the Edit menu to make changes to selections. |
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| If you predefine a selection area by dragging a marquee, the Paste command pastes to the center of the document window. |
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| In transformation mode, the bounding box displays a solid line on the bottom and right, and a pulsating line on the top and left. |
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| When you choose the Scale command on the Transform options bar, using the mouse allows you to SHIFT+drag a sizing handle on the bounding box to scale proportionately. |
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| Once you press the ENTER key to commit a transformation change, you cannot change your mind. |
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| Any transformations applied to a selection are made in relation to the selected reference point. |
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| When you point to any of the scrubby sliders on the Transform options bar, the mouse pointer changes to a hand with a double-headed arrow indicating its ability to drag. |
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| A positive number in the H box skews the selection to the left. |
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| If you drag the H, Y, W, or other labels to the left of the text boxes, the values in the text boxes change; dragging to the left increases the value. |
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| Photoshop allows you to apply transformations to selections only, not entire images or photos. |
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| The initial state of the document is displayed at the bottom of the History palette. |
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| When you select a state in the History palette, the image reverts to how it looked when that change first was applied. |
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| If you select Allow Non-Linear History box in the History Options dialog box, deleting a state deletes that state and those that came after it. |
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| All steps are recorded in the History palette. |
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| All states and snapshots from the last working session remain in the History palette, even after you close and reopen the document on which you were working. |
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| Selecting a state and then changing the image eliminates all the states in the History palette that came after it. |
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| The Lasso tool uses straight line segments. |
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| The Magnetic Lasso tool tries to find the edge of the object by looking for the closest color change and attaches the selection to the pixel on the edge of the color change. |
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| The Polygonal lasso tool displays fastening points on the edge of an object. |
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| The Magnetic Lasso tool is very effective for making selections on images with a busy background or images with low contrast. |
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| Unique to the Magnetic Lasso options bar is a text box to enter the contrast that Photoshop will consider in making the path selection. |
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| A Use tablet pressure to change pen width button on the Magnetic Lasso options bar is used to change the pen width when using graphic drawing tablets instead of a mouse. |
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| A Rate box allows you to specify the rate at which the magnetic lasso sets fastening points. |
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| The arrow keys are used to nudge a selection in small increments. |
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| To create a grid, you turn on the ruler display and then drag from the horizontal ruler at the top of the document window or from the vertical ruler at the left side of the document window. |
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| The grid is useful for laying out elements symmetrically. |
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| Snapping is a permanent magnetic hold. |
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| The Quick Selection tool is used to draw a selection quickly using the keyboard. |
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| The Magic Wand tool lets you select a consistently colored area without having to trace its outline. |
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| The Magic Wand tool especially is effective for solid colored objects. |
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| The Anti-alias check box selects colors using data from all visible layers. |
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| Photoshop immediately warns you if you have chosen a keyboard shortcut used somewhere else in the program. |
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| If you do not save new keyboard shortcuts that you create, they last for the current Photoshop session only. |
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| Keyboard shortcuts assigned to menu commands will display on the right of the command in the menu system. |
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