Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/~borders/cgvc120/week03.html
Дата изменения: Mon Jul 11 05:40:28 2011
Дата индексирования: Sun Feb 3 13:49:35 2013
Кодировка:

Поисковые слова: ъбртеэеооще урелфтбмшоще нкпкк
cgvc 121

week 03. Session 05 Tuesday, July 5

  • Color
  • Selections
    • Review Geometic Selections (rectangular and elliptical marquee, polygonal lasso tool)
    • Modifying Selections
    • Combining Selections
    • Magic Wand- selects part of an image based on the similarity in color of adjacent pixels.
      • Tolerance: Determines the similarity or difference of the pixels selected. Enter a value in pixels, ranging from 0 to 255. A low value selects the few colors very similar to the pixel you click.  A higher value selects a broader range of colors.
      • Anti-aliased: Creates a smoother-edged selection.
      • Contiguous:  Selects only adjacent areas using the same colors.  Otherwise, all pixels in the entire image using the same colors are selected.
      • Sample All Layers: selects colors using data from all the visible layers. Otherwise, the Magic Wand tool selects color from the active layer only.
    • Quick Selection Tool
    • Refine Edge- improves the quality of a selections edges and allows you to view the selection against different backgrounds for easy editing.
      • Radius: Determines the size of the region around the selection boundary in which edge refinement occurs.  Increase the radius to create a more exact selection boundary in areas with soft transitions or fine detail, such as those in short hair or fur, or blurred boundaries.
      • Contrast: Sharpens selection edges and removes fuzzy artifacts. Increasing contrast can remove excessive noise near selection edges cause by a high Radius setting.
      • Smooth: Reduces irregular areas [“hills and valleys”] in the selection boundary to create a smoother outline. Enter a value or move the slider from 0 to 100.
      • Feather: Creates a soft-edged transition between the selection and its surrounding pixels.  Enter a value or move the slider to define the width of the feathered edge from 0 to 250 pixels.
      • Contract/Expand: Shrinks or enlarges the selection boundary. Enter a value or move the slider to set the amount from 0 to 100% to expand, 0 to -100% to contract.  Most useful for making subtle adjustment to soft-edged selections. Shrinking the selection can help remove unwanted background colors from selection edges.
  • Expand, Contract, Feather
    • Expand: Can expand your selection by any number of pixels
    • Contract:  Can contract your selection by any number of pixels
    • Feather: Creates a soft transition by selecting the number of pixels you want it to transition
  • Color Range- is a selection tool that makes its selections by colors and sampled areas. Select a sample color and than the add sample dropper to refine your selection.
    • Localized Color: Selects colors adjacent to and on other parts of the photo
    • Range: Selects from the amount of click that you make
  • Replace Color- lets you select specific colors in an image and then replace those colors.  You can set the hue, saturation, and tightness of the selected areas. Or you can use the Color Picker to select the replacement color.

Week 03. Session 06 Thursday, July 7

  • Overview of Filters
    • Utilitarian (Sharpen, Blur, Noise)
    • Creative (Textures, Artistic, Brush Strokes, Distort, Render, Sketc, Stylize, etc.)
  • Filter Topics:
    • Applying filters nondestructively with Smart FIlters
    • Adding noise to an image with Add Noise Filter
    • Sharpening an image with Unsharp Mask
    • Applying a filter to mutliple layers
  • Blending Modes Topics:
    • Cycling through the Blending Modes
    • Three Blending Modes you must know
    • Adding a lens flare effect with Screen
    • Making a cast shadow more realistic with Multiply
    • Creating a diffused glow effect with Overlay
    • Sharpening an image with High Pass and Overlay

homework

Project 03 Object Series Due July 12th