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CSC/FAR 020, Computer Graphics, October 21, 2013

CSC/FAR 020, Computer Graphics, October 21, 2013. Dr. Dale E. Parson http://faculty.kutztown.edu/parson Outline for week 6 Retouch & Related,. Exposure. Retrieve retouch.zip from Parsons/Outbox. Open ParsonShadow.psd. Note face in hat’s shadow. Image -> Adjustments -> Shadow / Highlights

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CSC/FAR 020, Computer Graphics, October 21, 2013

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  1. CSC/FAR 020, Computer Graphics, October 21, 2013 Dr. Dale E. Parson http://faculty.kutztown.edu/parson Outline for week 6 Retouch & Related,

  2. Exposure • Retrieve retouch.zip from Parsons/Outbox. • Open ParsonShadow.psd. • Note face in hat’s shadow. • Image -> Adjustments -> Shadow / Highlights • Shadows brightens the shadow areas. • Amount increases luminance, keeps color ratios intact. • Radius gives number of pixels measured for correction. • Tonal width gives range of pixel values used for correction. • Highlights darkens the highly lit areas.

  3. Exposure Continued • Midtone contrast sets amount of contrast in middle-light areas. • Black and white clipping set cutoff levels. • Color correction boosts or drops saturation. • Try effect on entire image. • Note loss of contrast in rock shadows. • Try effect on figures after magnetic lasso selection of figures only.

  4. Photo Filters • Add a Photo Filter Adjustment Layer. • You might think cooling would be appropriate for the desert, but . . . • Warming or red filtering works better with the rocks. • Density adjusts the filter’s visual thickness. • Try adjusting opacity and fill of this adjustment layer as well.

  5. Correcting Overexposure in an Adjustment Layer • Delete the previous filter adjustment layer. • Add a Levels adjustment layer. • Use Blending Mode Multiply to darken. • Use Blending Mode Screen to lighten. • You can add multiple Adjustment Layers -> Levels -> Blending Mode Multiply for successive approximation. Tweak opacity of final layer. • Merge Adjustment Layers when you are satisfied.

  6. Correcting Backlit Photos • Close Photoshop files without saving. • In Bridge, select ParsonUnshavedDarkS210. • Do NOT open in Photoshop. • Edit -> develop settings -> camera raw defaults • Double click opens with camera raw. • Fill Light slider corrects for back lighting. • Open in Photoshop, compare to ParsonUnshavedDarkS210 Copy (original).

  7. Correcting Backlit Photos – Manual Alternative • Edit -> Develop settings -> Clear Settings in Bridge. • Open ParsonUnshavedDarkS210 in Photoshop. • Add a Levels Adjustment Layer, adjust upper and midrange sliders for exposure. • To darken background, add a layer mask, Fill with Black, and then Brush with White to remove portions of the mask to lighten areas. • Filter -> Render -> Lighting Effects to add spotlights, etc.

  8. Lens Blur Filter • Reopen ParsonShadow (desert photo), Duplicate Background Layer. • Add a Layer Mask, use Gradient tool to apply a back/white foreground/background gradient. • Verify Layer Mask, then Disable. • Select the layer’s image thumbnail, then use Filter -> Blur Lens to add blurring. • Set blur filter to layer mask as reference.

  9. Motion Blur and Smart Image • Start over with a Duplicate Layer of ParsonShadow. • Filter -> Convert for Smart Filter to create a filter with parameters you can tweak after you apply the filter. • Filter -> Motion Blur, set the parameters. • Paint with Black or Fill with Black in the Smart Filters Mask to unblur a section. • Double Click the Motion Blur entry below the mask to recompute the blur parameters.

  10. Smart Gaussian Blur • Start over with a Duplicate Layer of ParsonShadow. • Filter -> Convert for Smart Filter to create a filter with parameters you can tweak after you apply the filter. • Select an area before blurring, then Invert selection to select the surrounding image. • Filter -> Blur -> Gaussian Blur.

  11. Removing Spherical andChromatic Lens Aberrations • Open, Duplicate Layer for ParsonUnshavedD90.jpg. • Note spherical aberration. • Filter -> Convert for Smart Filters. • Use Filter -> Distort -> Lens Corrections to remove Spherical Aberration. • Use Scale to restore foreground image size. • Lens Correction also removes Chromatic Aberration.

  12. Sharpen Focus • Open, Duplicate Layer for ParsonFocus.jpg. • Note out of focus professor. • Select professor’s pixels. • Filter -> Sharpen -> Smart Sharpen. • We won’t make a smart layer -- too time consuming. • Amount 213%, pixels 10 seems in the ballpark. • Toggle Preview on and off. • “Pixels” says where to look for “stray photons.” • “Amount” is how far to move them.

  13. Unsharp Mask • Open, Duplicate Layer for ParsonFocus.jpg. • Note out of focus professor. • Select professor’s pixels. • Filter -> Sharpen -> Unsharp Mask. • We won’t make a smart layer -- too time consuming. • Amount 223%, pixels 4.6 seems tolerable. • Toggle Preview on and off. • I don’t like this one as much.

  14. Duplicating Color Range of one Document in Another • Close All Photoshop, then from Bridge open ParsonShadow then ParsonFocus. • Duplicate Layer in ParsonFocus (target). • Image -> Adjustments -> Match Color. • Use ParsonShadow as the source. • Vary parameters to temper the effect.

  15. Clone Stamp AcrossLayers and Images • Open fresh copies of ParsonShadow and RohrbachCenter. • Using multiple layers, Clone Stamp from one to another. • Using multiple image files, Clone Stamp from one to another.

  16. Color Replacement • In ParsonFocus -> Layer -> Copy Background. • Select the boring, washed-out shirt. • Image -> Adjustments -> Replace Color. • Use eyedropper to select source color. • Use Color Pickers to tune input-to-output. • Use Fuzziness to set color tolerance for input. • You can make teeth whiter, beards darker.

  17. “Softening Focus” • Filter -> Blur -> Surface Blur can soften focus. • Remove unwanted blemishes. • This also works with smart Filters. • You can paint away the effect with a layer mask. • Test parameters on ParsonOnWhiteD90. • It’s like putting on 10 pounds of makeup!

  18. Nip / Tuck • ParsonUnshavedD90 -> Duplicate Layer • Healing Brush cleans up gray area under eye. • It combines Clone Stamp usage with using pixel colors from area being healed. • Select an Ellipse on the forehead, then use Patch Tool to create a Third Eye. • The Spot Healing Brush is a wrinkle remover. • It copies and merges pixels from a parallel stroke.

  19. Red Eye Repair • Use Image -> Adjustments -> Replace Color to give me a Red Eye. • Use Pupil Size just over 50%, Darken just under 50%. • We will do the classic Halloween assignment again.

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