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Adobe Photoshop CS5 : Sizing Digital Images - Resizing an Image (part 3) - Rotate Canvas Command, Free Transform Command

1/8/2013 5:27:59 PM
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4.Rotate Canvas Command

Sometimes your image will need to be rotated or flipped. Loading your image upside down on the scanner, loading a slide backwards into a slide scanner, or turning the camera on its side when taking a portrait can cause inverted or reverse images. You may also want to make a change to your image for compositional purposes.

The Rotate Canvas command offers several choices. You can choose to rotate the image 180° (half a rotation), 90° clockwise or counterclockwise, or an arbitrary amount (the user types in a number of degrees). Additionally, the entire canvas can be flipped (creating a mirrored image). You can choose to flip the canvas horizontally or vertically:

1.
Open the image Ch04_Rotate.tif from.

2.
Choose Image > Rotate Canvas 90° CW (clockwise). The image is now properly oriented.

Fluid View Rotation

There may be times when you want to freely rotate your view (just as you might angle a piece of paper to make it easier to draw). In this case, you are rotating just the view, not the actual image. Just press R to access the Rotate View tool. You can then click within the canvas and rotate the image for distortion-free viewing at any desired angle. This makes it really easy when painting or cloning to avoid having to crank your head or wrist in the middle of a brush stroke. Photoshop provides a compass to help you stay oriented, and you can click the Reset View button in the Options bar to return the canvas to its default orientation. You’ll need an Open GL capable graphics card to use this feature.


5. Free Transform Command

The Free Transform command is another useful way to rotate and size an image. It works best when you have an object located on its own floating layer (not a Background) or if you have an active selection.


1.
Open the file Ch04_Free_Transform_ Basic.psd.

This image has two layers: a background, which is a pattern, and a vector shape layer. A vector layer is a special layer in Photoshop. It can be resized and transformed repeatedly with no degradation in quality. Vector layers use math to describe curves and can be freely manipulated.

2.
If it’s not visible, call up the Layers panel by selecting Windows > Layers.

3.
Select the Vector Shape layer so it is active.

4.
Choose Edit > Free Transform or press Command+T (Ctrl+T).

You can access several controls for the Free Transform command by right-clicking/Control-clicking. Try the following transformations on the Vector Shape layer. You can press the Esc key to cancel the transformation or Return (Enter) to apply it.

  • Scale. You can scale by dragging a handle. Hold down the Shift key as you drag a corner handle to scale proportionately. Hold down the Option (Alt) key to scale in both directions simultaneously. To scale numerically, enter a value in the Options bar.

  • Rotate. You can rotate a preset amount by selecting Rotate 180°, Rotate 90° CW, or Rotate 90° CCW. To rotate freely by dragging, move your mouse outside the Free Transform box. It will become a curved, two-headed arrow. Hold down the Shift key while rotating to constrain the rotation to 15° increments. Additionally, you can rotate numerically by entering degrees in the rotation box in the Options bar.

  • Skew. Skewing an image creates a sense of distortion, as if the image were leaning. To skew the image, hold down Command+Shift (Ctrl+Shift) and drag a side handle (not a corner handle). The cursor will change to a white arrowhead with a small double arrow.

  • Distort. If you want to distort an image freely, choose Distort. This allows you to move the corners of the image freely (a process also known as corner-pinning). You can also access this command by pressing Command (Ctrl) while dragging a corner point.

  • Perspective. Transforming perspective creates the illusion that the image is being viewed from above or from the side. You can access this command by pressing Command+Option+Shift (Ctrl+Alt+Shift) or from the context menu. This is a useful command to fix perspective problems or to add perspective effects.

  • Warp. The Warp command was first introduced in Photoshop CS2. It allows you to distort an image into a number of predefined shapes available in the Options bar (such as Arch, Flag, or Twist). By choosing Custom, several points can be freely dragged to distort the image as desired.

  • Flip Horizontal and Flip Vertical. These simple commands let you flip an individual layer without flipping the entire canvas.

The Free Transform command has one major benefit over choosing individual transform commands from the Image menu: Free Transform lets you apply transformations in one continuous operation, which reduces quality loss in raster images.

Open the file Ch04_Free_Transform_Additional.psd. Using the Free Transform command, you can rotate, size, and flip the images to create a better layout.

 
Others
 
- Adobe Photoshop CS5 : Sizing Digital Images - Resizing an Image (part 2) - Crop Tool
- Adobe Photoshop CS5 : Sizing Digital Images - Resizing an Image (part 1) - Image Size, Canvas Size
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