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North Texas PC User’s Group

North Texas PC User’s Group. Photoshop SIG Hillary Morgan Ferrer Session 3 - August 18, 2007. What we will cover today. Color Theory Histograms Exposure Correcting for Exposure Correcting for Color. C O L O R. Color Theory. The Color Wheel Really Young Girls Can Become Mothers

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North Texas PC User’s Group

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  1. North Texas PC User’s Group Photoshop SIG Hillary Morgan Ferrer Session 3 - August 18, 2007

  2. What we will cover today • Color Theory • Histograms • Exposure • Correcting for Exposure • Correcting for Color

  3. COLOR

  4. Color Theory • The Color Wheel • Really Young Girls Can Become Mothers • Boys make really young girls cry • To take out x you add y

  5. Color Opposites • To take out Red, add Cyan • To take out Green, add Magenta • To take out Blue, add Yellow • And Vice Versa • (examples in PS)

  6. Ways to Manipulate Color in Photoshop • Levels • Curves • Hue/saturation • Selective Color • Color Balance • Photo Filters • Channel Mixer

  7. How Photoshop sees Color • Photoshop sees color in terms of numbers • These numbers are graphed onto a graph called a “histogram” • 8 bits = 256 shades • 0 - 255 • 0 = black • 255 = white

  8. Histograms • For each color, you have this histogram telling you how much of which shade of each color the picture contains. • The colors exist in something called “Channels” • RBG, CMYK

  9. Normal Histogram • No excess of bright whites • No excess of Dark Darks

  10. Bright White Histogram • Picture is predominantly white, so we see a predominant number of pixels on the right side of the histogram

  11. Dark Histogram • Picture predominantly black, so we see a predominant number of pixels on the dark end

  12. Correcting Exposure • Levels • Slide on RGB scale • Slide on R,G,B scale • Black point, white point droppers • Finding Black/White points with alt • Shifting midtones

  13. Correcting Exposure • Curves • Overall darken/lighten • Contrast curve

  14. Over/Under

  15. Over/Under Corrected

  16. White Balance • Makes Colors Neutral • Bright Sun, Cloudy, Open Shade, Tungsten, Flash, Strobe, Halogen • MUST do before with JPG • Can do post with RAW • Measured in degrees Kelvin • Higher the degrees, the bluer it looks • Lower the degrees, the redder it looks

  17. Light Temperatures • Open Shade/Cloudy - 6500 • Direct Sunlight - 5600 • Fluorescent - 3400-3800 • Tungsten - 3200

  18. Shot on Cloudy Day

  19. Eyedroppers in Levels

  20. Ways to neutralize color in PS • Even when color balance in camera, can still get color cast • Gray card • Eye dropper in curves, levels • Auto color • By sight (assuming you have calibrated monitor) • Example (John roar)

  21. Homework…

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