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Chapter07 Chapter07 Presentation Transcript

  • Ch 7: Selecting Pixels Photoshop CS6 Essentials By Scott Onstott
  • Ch 7: Selecting Pixels Using the Rectangular Marquee • Hold the Shift key to make square selections • Hold the Opt key to create the rectangle/square from the center • Hold the Cmd key to cut the selection and move it with the cursor • Use the arrow keys to nudge the selection one pixel at a time • You can feather the selection on the options bar which means partially select pixels at the edges Image courtesy Richard Trueman
  • Ch 7: Selecting Pixels Using Fixed Ratios and Sizes • Choose Fixed Size if you want to make a selection based on a number of pixels. • You can also use a fixed size based on a number of inches or centimeters; type in or cm on options bar to make marquee size based on resolution • To use the golden rectangle proportion (shown at right) use Fixed Ratio style with Width set to 1 and Height set to 1.618 or vice versa Image courtesy Richard Trueman
  • Ch 7: Selecting Pixels Saving and Loading Selections • Selections are lost when you close files in Photoshop unless you save them • Save a selection using the Select menu • Saving a selection creates an alpha channel which is a grayscale image representing the selection (white is selected, black is not and shades of gray are partially selected) • The variety of file formats supporting alpha channels is limited • Load a selection from the Select menu or by Cmd-clicking its alpha channel thumbnail
  • Ch 7: Selecting Pixels Lassoing Selections • Select pixels freehand by drawing loops with the lasso • Hold Shift to add to the selection • Hold Opt to subtract from the selection • Alternatively use the Boolean mode buttons on the options bar to add/subtract/intersect and create new selections • Using a tablet stylus can made lassoed selections more accurate Photo courtesy of iStockphoto, ©Doga Yusuf Dokdok, Image #10283262
  • Ch 7: Selecting Pixels Fading Effects • The purpose of selection is to do “something” to the pixels you are identifying • The sky’s the limit on what that “something” can be. For example, you might use adjustments, masks, or filters on selections. • You have the opportunity immediately after applying that special something to Fade it using the Edit > Fade command. • Fade is like Undo on a slider. Photo courtesy of iStockphoto, ©Doga Yusuf Dokdok, Image #10283262
  • Ch 7: Selecting Pixels Drawing Selections • You can use vector drawing tools such as the rectangle, circle, pen tool, and so on to create selections • Use Paths mode on the options bar when using a drawing tool • After creating a work path click the Load Path As Selection icon at the bottom of the Paths panel • Alternatively Hold Cmd and click the Add Layer Mask icon at the bottom of the Layers panel to add the work path as a vector mask Photo courtesy of iStockphoto, ©Luis Alvarez, Image #978869
  • Ch 7: Selecting Pixels Painting Selections: • Press Q or click the bottommost button in the Tools panel to enter Quick Select mode • Press B to select the Brush tool and choose a brush tip, size, and hardness • Paint on the image and a transparent red overlay called rubylith appears • Press Q again (or click the same bottom button) to convert your painting into a selection Photo courtesy of iStockphoto, ©Martin Bowker, Image #4954117
  • Ch 7: Selecting Pixels Selecting by Color • Choose Select > Color Range to select by color • Select the Add to selection eyedropper in the Color Range dialog box and drag across the thumbnail to select a range of colors • Adjust the sliders to fine tune the range of colors that area selected and click OK • Remove any unwanted stray pixels from the selection with the Lasso tool Photo courtesy of iStockphoto, ©K.J. Schraa, Image #2351702
  • Ch 7: Selecting Pixels Quick Select and Refine Edge • The Quick Select tool can create a rough selection with on-the-fly edge analysis by dragging the tool as if it were a paintbrush • You can remove pixels by holding Opt with the Quick Select tool • After you have a rough selection use Refine Edge to clean it up • Use the Refine Radius tool within Refine Edge and paint over any problem areas such as hair • This combination of tools is very fast and efficient Photo courtesy of iStockphoto, ©Hammondovi, Image #13707719