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Photoshop for Designers: Color
Illustration by John Hersey

Color correction by the numbers


From:

Photoshop for Designers: Color

with Nigel French

Video: Color correction by the numbers

Here I have an old image that was scanned from a transparency; it has a very noticeable blue cast. All of the aforementioned color correction techniques that I've discussed in this chapter would work to address that cast, but I think we can do it more precisely using a numerical technique. And what I've done is I've put a sample point down here in this foreground area on this concrete floor. So I need you to buy into the idea that the concrete floor should be gray, concrete is gray.
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  1. 1m 41s
    1. Welcome
      1m 0s
    2. Using the exercise files
      41s
  2. 25m 26s
    1. Defining color terms
      2m 38s
    2. Understanding the color wheel
      4m 3s
    3. Understanding color relationships
      1m 7s
    4. Using Kuler to understand color harmony rules and create color palettes
      4m 2s
    5. Using the Kuler web site
      3m 10s
    6. Colors on screen and on paper
      1m 42s
    7. Color as a signifier
      3m 14s
    8. Color inspirations
      2m 39s
    9. Color and accessibility
      2m 51s
  3. 38m 22s
    1. Demystifying the Color Picker
      2m 57s
    2. Understanding the role of foreground and background colors
      5m 39s
    3. Choosing colors
      6m 41s
    4. Managing swatches
      7m 40s
    5. Transparency
      9m 42s
    6. Color channels
      5m 43s
  4. 41m 4s
    1. Understanding additive and subtractive color
      2m 57s
    2. RGB mode
      1m 56s
    3. CMYK mode
      2m 41s
    4. Lab mode
      3m 49s
    5. Indexed mode
      2m 16s
    6. Grayscale mode
      5m 0s
    7. Color management
      14m 15s
    8. Color depth (8-, 16-, 24-, and 32-bit)
      4m 19s
    9. Monitor calibration
      3m 51s
  5. 26m 43s
    1. Evaluating color with the Histogram panel
      3m 18s
    2. Evaluating color with the Info panel
      1m 48s
    3. Boosting color with levels
      3m 48s
    4. Auto Tone and Auto Contrast
      7m 38s
    5. Manually setting the black and white point
      3m 50s
    6. Curves
      6m 21s
  6. 18m 30s
    1. What is color correction?
      5m 45s
    2. White balancing in Camera Raw
      1m 46s
    3. Color correction with color balance
      1m 34s
    4. Color balancing using photo filters
      1m 26s
    5. Color correction with variations
      4m 27s
    6. Color correction by the numbers
      3m 32s
  7. 33m 14s
    1. Selecting color with the Magic Wand
      4m 43s
    2. Selecting color with the Quick Selection tool
      2m 26s
    3. Selecting color with Color Range
      4m 0s
    4. Neutralizing whites with the Multiply blend mode
      2m 55s
    5. Neutralizing blacks with the Screen blend mode
      57s
    6. Masking colors with the Blend If sliders
      2m 54s
    7. Masking hair with a channel mask and removing contaminant colors
      2m 58s
    8. Shifting targeted colors using Hue/Saturation
      5m 4s
    9. Matching colors using Hue/Saturation
      3m 16s
    10. Matching colors using the Match Color command
      1m 36s
    11. Matching colors using the Color blend modes
      2m 25s
  8. 21m 8s
    1. Saturating colors
      4m 9s
    2. Desaturating colors
      1m 57s
    3. Desaturating in Camera Raw
      3m 1s
    4. Creating a color accent with selective saturation
      2m 38s
    5. Enhancing a sunrise with a gradient map
      5m 49s
    6. Increasing vibrance
      1m 19s
    7. Using selective color
      2m 15s
  9. 32m 42s
    1. Designing with spot colors
      12m 15s
    2. Adding a fifth color to a CMYK image
      5m 0s
    3. Adding spot colors to a grayscale image
      5m 24s
    4. Create a metallic print effect
      3m 8s
    5. Creating duotones, tritones, and quadtones
      6m 55s
  10. 30m 45s
    1. Creating a silkscreen print look with a limited color palette
      7m 59s
    2. Combining color with black and white
      2m 22s
    3. Creating a nostalgic travel poster using the Cut Out filter
      6m 27s
    4. Mapping an image to a color look up table (CLUT)
      7m 56s
    5. Converting to black and white
      6m 1s
  11. 48m 34s
    1. Creating a hand-tinted portrait (the easy way)
      3m 29s
    2. Creating a hand-tinted portrait (the harder way)
      11m 23s
    3. Creating an Andy Warhol look
      4m 44s
    4. Applying a gradient map
      4m 4s
    5. Sepia toning an image
      8m 41s
    6. Color tinting an image
      5m 15s
    7. Split toning an image
      2m 9s
    8. Working with line art
      8m 49s
  12. 23s
    1. Goodbye
      23s

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Photoshop for Designers: Color
5h 18m Intermediate Jan 04, 2012

Viewers: in countries Watching now:

In this Photoshop for Designers course, Nigel French focuses on the tools and features in Photoshop designed for choosing, applying, and editing color. The course looks at concepts such as the color wheel and color harmonies as well as the practicalities of using the Color Picker, leveraging the power of color channels, and the characteristics of different color modes in Photoshop. The course includes exercises on correcting color, enhancing color, shifting and replacing colors, working with spot color channels, hand coloring black and white images, and designing with a reduced color palette.

Topics include:
  • Defining color terms
  • Using Kuler to create color palettes
  • Understanding additive and subtractive color
  • Understanding color management
  • Using the Levels, Curves, Auto Tone, and Auto Contrast adjustments
  • Color correction
  • Selecting color—from the Magic Wand to Color Range
  • Neutralizing blacks and whites with blend modes
  • Matching colors
  • Saturating and de-saturating colors
  • Increasing saturation with Vibrance
  • Designing with spot color
  • Colorizing images
Subjects:
Design Color Design Techniques
Software:
Photoshop
Author:
Nigel French

Color correction by the numbers

Here I have an old image that was scanned from a transparency; it has a very noticeable blue cast. All of the aforementioned color correction techniques that I've discussed in this chapter would work to address that cast, but I think we can do it more precisely using a numerical technique. And what I've done is I've put a sample point down here in this foreground area on this concrete floor. So I need you to buy into the idea that the concrete floor should be gray, concrete is gray.

We are all agreed on that. So when I look at the sample point, we see that I have Red: 149, Green: 140, Blue: 194. Remember, for neutral gray, we need all three numbers the same. So what I'm going to do here is using a curve, I'm going to adjust the green curve and I'm going to bring that up to red to 149. 149 is the number we're aiming for here, I'm using the middle value. Then I'm going to leave the red as it is and I'm going to go to the blue curve and bring that down to 149.

Adjusting the green curve isn't going to make much difference because there is not much in it anyways; only 9 levels difference, but adjusting the blue curve is going to affect a tremendous change to this image. So I'm going to come down here to my adjustment layers and choose Curves where I don't want to work on the RGB curve; I want to work on the green curve. Remember, I'm leaving red where it is, and now what I want to do is I want to sample that exact point onto my curve.

I want to see where it occurs on the curve. To make things a little bit easier, if I were to just come back and click in the same place, chances are I wouldn't get exactly the same spot. So I'm going to press my Caps Lock key which turns my cursor to an accurate cursor and then I can position that over the sample point that I have, and hold down my Command key and my Shift key. If I do Command and Shift, it's going to put this point on all three of my color curves and click.

So there is that point on the green curve. Did I get it exactly right? No, I didn't, doesn't matter. Input, I'm going to change that to my input value, my starting color value right here. My Input is going to be 140, my Output is going to be 149, and you'll see that brings the green curve up. As I said, it doesn't really change much about the appearance of the image. But now when we go to the blue curve, let me see there is the point, the equivalent point on the blue curve.

I want the input to be, that's quite a long way off there, 194, and I want the output to be 149, and we can see that makes a massive difference. Let's take a look at this image before. If I turn off that adjustment layer, there we have the blue cost and the after, you'll notice that at my sample point, I have complete neutrality 149, 149, 149, but more important than that, the image looks a whole lot better.

So this is color correction by the numbers. A variant of this technique and the result tends to be much the same is that you add all three numbers together divided by three and then that becomes the output that you are aiming for, for all three of your color curves. Give it a go, you'll be very impressed.

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