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North Texas PC User’s Group

Join us for a deep dive into color theory and image correction techniques in Photoshop. In this session, we'll explore the fundamentals of color through the color wheel, histograms, and exposure settings. Learn how to manipulate color effectively using tools like levels, curves, and selective color adjustments. We will cover balancing colors and correcting photographs for optimal appearance, while understanding how Photoshop interprets color data. Perfect for beginners and enthusiasts looking to elevate their editing skills!

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North Texas PC User’s Group

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Presentation Transcript

  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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