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CSC/FAR 020, Computer Graphics, September 21-23, 2009 Dr. Dale E. Parson Outline for week 3-4 Remote drives in the lab If you do not find the Student Projects or Faculty-Folders folders on the lab machines: Finder -> Go (menu) -> Connect to Server

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csc far 020 computer graphics september 21 23 2009

CSC/FAR 020, Computer Graphics, September 21-23, 2009

Dr. Dale E. Parson

Outline for week 3-4

remote drives in the lab
Remote drives in the lab
  • If you do not find the Student Projects or Faculty-Folders folders on the lab machines:
  • Finder -> Go (menu) -> Connect to Server
  • Enter:
  • Supply K.U. login and password.
  • Student Projects or Faculty-Folders will appears in the Finder.
changing canvas size and crop tool
Changing Canvas Sizeand Crop Tool
  • Retrieve CropLayerSelect from Parsons -> Outbox and unzip on desktop. Browse using the Bridge.
  • Open NIME2009GeOcarina.jpg in Photoshop.
  • Image -> Canvas Size to shrink or grow the canvas.
      • Undo changes, try again.
  • Use Crop Marquee to crop the image.
      • Make sure Options Width, Height and Resolution are Clear.
      • Shield option highlights area to crop.
      • Crop area can be resized, moved, or rotated.
      • Use Enter or Control-click to accept, Escape to cancel.
      • Width and Height can set aspect ratio.
using crop tool to copy image size
Using Crop Tool to Copy Image Size
  • Save a smaller version of NIME2009GeOcarina.jpg as WxH.psd (5X7.psd) in inches.
  • With WxH.psd still open after saving, open Nime2009Trombon1.jpg from the Bridge.
  • In Crop Tool click Clear and Front Image from within 5X7.psd. Now crop Nime2009Trombon1.jpg, rotating marquee to get alignment.
  • Get both images to the same size.
  • Set background to black and enlarge the 5X7.psd to a size that can hold both images by stretching crop region.
  • Select -> All on the trombonist, paste and position into a layer.
regular marquee cropping
Regular Marquee Cropping
  • Select and area with the Marquee selector.
      • Optionally constrain size of Ratio.
  • Image -> Crop to crop from here.
  • Image -> Trim trims away fixed color margins.
  • Ruler Tool (grouped with Eyedropper) allows you to orient along some alignment feature.
  • Image -> Image Rotation -> Arbitrary rotates to this line.
  • Merge the pair of layers in WxH.psd via the Layers command.
  • Sweep a marquee.
  • Create a new Layer via Copy from Layer menu.
  • Undo, try the same with Layer via Cut.
  • Convert background to a layer and back.
  • Layer groups are like Folders. They are useful for maintaining layers.
basic selection
Basic Selection
  • Open NVLakeFireFigure.jpg from Bridge.
  • Select -> All selects all pixels in layer.
      • Note other selection options.
  • Rectangular and Elliptical Selection tools:
      • Options on option bar, go into Refine Edge and explore.
  • Lasso Tools allows rough selection
      • Note new/add/subtract/intersect options.
      • Shift-sweep also adds to selection.
      • Alt/Option-sweep subtracts from selection.
polygonal and magnetic lasso
Polygonal and Magnetic Lasso
  • Draw straight-edge polygons around area,
      • Double-click anywhere or single-click start point to end.
      • Delete key cancels last vertex (last point clicked).
      • Alt/option sweeps reverts to free-form lasso.
  • Magnetic lasso assists using edge detection.
      • Delete and alt/option also work here.
      • Sometimes it closes its own areas based on boundaries.
      • Use zoom (command + and command -) with this.
selections based on color
Selections Based on Color
  • Go to original NVLakeFireFigure.jpg .
      • Clear selections.
  • Use Quick-Selection tool to select the sky.
      • Auto-enhance to improve edge detection.
      • Change brush area to sample larger range of pixels.
      • Add sky and subtract clouds, etc.
      • Use magnetic lasso + and – for fine tuning.
  • Magic wand selects pixels using nearby colors.
      • Lower tolerance is more selective.
      • Control-click Similar to add non-adjacent regions.
  • Create new image with black background.
  • Select All -> copy and paste a new layer.
  • Use color-based tools to Delete portions of image.
select color range
Select -> Color Range
  • Selects based on pixel values with a range of fuzziness. NVLakeFireFigure.jpg:
      • Select the sky within some range of color values.
      • Vary Color Range and “Refine Edge” option parameters.
      • Select -> Inverse, then Marquee subtraction and Magic Wand subtraction to get the rock Figure only.
  • Edit -> Copy, Layer -> New from Copy.
  • Save As Dali.psd.
get rid of the pesky text
Get rid of the pesky text.
  • Edit the new Layer that we just created.
  • Zoom in and use Magic Wand to select text.
      • Cut it to transparent background.
  • Use Select -> Color Range and Marquee Intersection to select & delete black smudges in the text borders.
  • Use Magic Wand to get a letter’s shape, slide the selection, copy some nearby pixels, then paste them back onto the letter.
  • Merge the two working layers and repeat, smudge.
adding layers
Adding layers
  • Add a series of layers from other photos.
      • Select all -> Copy -> Paste (across image files).
      • Drag a layer from one image to another
  • Use cloudy Kutztown sky to fill transparent sky layer.
  • Size layers using crop tool set to target image dimensions.
  • Stack additional, semi-transparent monochrome layers.