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Photoshop CS4 Essential Training

Removing a color cast


From:

Photoshop CS4 Essential Training

with Jan Kabili

Video: Removing a color cast

Sometimes an image has an overall colorcast like the one that you see here. There are lots of ways to correct a colorcast, some more complicated than others. In this movie I'd like to show you a few quick ways to try to eliminate a colorcast in a photo. None of these are guaranteed and they don't always work on all images but they're certainly worth a try. The first one is the Auto Color command. I'm going to go up to the Image menu at the top of the screen and there I see 3 Auto commands: Auto Tone, Auto Contrast and Auto Color.
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  1. 2m 31s
    1. Welcome
      1m 27s
    2. Using the example files
      1m 4s
  2. 25m 14s
    1. Touring the interface
      4m 25s
    2. Working with tabbed documents
      5m 15s
    3. Using tools efficiently
      3m 51s
    4. Arranging panels
      3m 53s
    5. Customizing keyboard shortcuts
      2m 50s
    6. Saving a custom workspace
      3m 0s
    7. Changing screen modes
      2m 0s
  3. 19m 3s
    1. Touring the Bridge interface
      6m 31s
    2. Opening images from Bridge
      1m 20s
    3. Reviewing images
      4m 42s
    4. Finding images
      6m 30s
  4. 44m 53s
    1. Setting preferences
      4m 23s
    2. Choosing color settings
      8m 11s
    3. Zooming and panning
      5m 27s
    4. Resizing and image resolution
      3m 17s
    5. Adding to the canvas
      2m 2s
    6. Rotating the canvas
      1m 44s
    7. Choosing color
      4m 49s
    8. Sizing a brush tip
      3m 4s
    9. Undoing and the History panel
      5m 0s
    10. Saving and file formats
      3m 29s
    11. Creating a file from scratch
      3m 27s
  5. 37m 58s
    1. Making geometric selections
      6m 14s
    2. Modifying selections
      4m 43s
    3. Combining selections
      3m 16s
    4. Using the Quick Selection tool
      5m 34s
    5. Refining selection edges
      4m 12s
    6. Using Quick Mask mode
      2m 18s
    7. Selecting with the improved Color Range command
      4m 32s
    8. Selecting with the Magnetic Lasso tool
      2m 28s
    9. Using the Background Eraser tool
      3m 7s
    10. Saving selections
      1m 34s
  6. 39m 56s
    1. Understanding layers
      5m 43s
    2. Creating layers
      5m 12s
    3. Working in the Layers panel
      2m 19s
    4. Locking layers
      4m 17s
    5. Working with multiple layers
      4m 6s
    6. Merging and flattening layers
      3m 55s
    7. Adding a shape layer
      4m 43s
    8. Basic layer masking
      4m 23s
    9. Using layer blend modes and opacity
      5m 18s
  7. 23m 19s
    1. Cropping
      3m 26s
    2. Straightening
      3m 17s
    3. Transforming
      4m 42s
    4. Working with Smart Objects
      6m 48s
    5. Using Content-Aware Scaling
      5m 6s
  8. 1h 10m
    1. Reading histograms
      4m 21s
    2. Using adjustment layers and the Adjustment panel
      6m 4s
    3. Adjusting tones with Levels
      7m 49s
    4. Limiting adjustments with layer masks
      5m 40s
    5. Using masks in the new Masks panel
      6m 9s
    6. Limiting adjustments by clipping
      3m 6s
    7. Adjusting with Shadow/Highlight
      5m 7s
    8. Adjusting with Curves
      7m 37s
    9. Adjusting with Hue/Saturation
      3m 42s
    10. Adjusting with Vibrance
      2m 16s
    11. Removing a color cast
      4m 26s
    12. Using the Black & White adjustment layer
      2m 39s
    13. Using the Dodge Burn and Sponge tools
      4m 11s
    14. Reducing noise
      2m 39s
    15. Sharpening
      4m 42s
  9. 38m 0s
    1. Using the Spot Healing Brush tool
      5m 17s
    2. Using the Healing Brush tool
      5m 51s
    3. Using the Patch tool
      4m 52s
    4. Using the Clone Stamp tool
      4m 8s
    5. Enhancing eyes
      9m 29s
    6. Changing facial structure
      5m 0s
    7. Softening skin
      3m 23s
  10. 44m 38s
    1. What's a raw image?
      4m 25s
    2. Touring the Camera Raw interface
      7m 35s
    3. Working in the Basic panel
      7m 54s
    4. Working in the Tone Curve panel
      2m 21s
    5. Working in the HSL/Grayscale and Split Toning panels
      3m 46s
    6. Looking at the other Camera Raw panels
      3m 45s
    7. Using the Adjustment Brush tool
      4m 2s
    8. Using the Graduated Filter tool
      3m 56s
    9. Working with multiple files
      6m 54s
  11. 21m 6s
    1. Using the Brushes panel
      8m 30s
    2. Filling with color
      3m 49s
    3. Replacing color
      4m 14s
    4. Using gradients
      4m 33s
  12. 16m 55s
    1. Working with point type
      9m 59s
    2. Working with paragraph type
      3m 17s
    3. Warping text
      3m 39s
  13. 25m 23s
    1. Adding a layer style
      4m 6s
    2. Customizing a layer style
      3m 35s
    3. Copying a layer style
      3m 5s
    4. Creating a new style
      3m 32s
    5. Using Smart Filters
      5m 22s
    6. Working in the Filter Gallery
      5m 43s
  14. 13m 14s
    1. Auto-blending focus
      4m 47s
    2. Creating Photomerge panoramas
      4m 2s
    3. Combining group photos
      4m 25s
  15. 23m 27s
    1. Creating an action
      7m 16s
    2. Batch processing with an action
      6m 36s
    3. Using the Image Processor
      9m 35s
  16. 29m 20s
    1. Printing
      11m 32s
    2. Making a contact sheet from Bridge
      6m 12s
    3. Creating a web gallery from Bridge
      7m 17s
    4. Preparing photos for the web
      4m 19s
  17. 30s
    1. Goodbye
      30s

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Photoshop CS4 Essential Training
7h 55m Beginner Oct 13, 2008

Viewers: in countries Watching now:

Photoshop has become an indispensible tool for photographers, designers, and all other creative professionals, as well as students. Photoshop CS4 Essential Training teaches a broad spectrum of core skills that are common to many creative fields: working with layers and selections; adjusting, manipulating, and retouching photos; painting; adding text; automating; preparing files for output; and more. Instructor Jan Kabili demonstrates established techniques as well as those made possible by some of the new features unique to Photoshop CS4. This course is indispensable to those who are new to the application, just learning this version, or expanding their skills. Example files accompany the course.

Topics include:
  • Learning and customizing the interface and workspace
  • Utilizing various manual and guided selection techniques
  • Working with Adobe Camera Raw
  • Adding special effects with layer styles and Smart Filters
  • Creating Photomerge panoramas
  • Optimizing photos for the web and creating web galleries
Subject:
Photography
Software:
Photoshop
Author:
Jan Kabili

Removing a color cast

Sometimes an image has an overall colorcast like the one that you see here. There are lots of ways to correct a colorcast, some more complicated than others. In this movie I'd like to show you a few quick ways to try to eliminate a colorcast in a photo. None of these are guaranteed and they don't always work on all images but they're certainly worth a try. The first one is the Auto Color command. I'm going to go up to the Image menu at the top of the screen and there I see 3 Auto commands: Auto Tone, Auto Contrast and Auto Color.

Auto Color is the one to try to remove a colorcast. I'll select it, and that is the result on this particular image. So that you can compare this to the original, I'll press Command+Z on a Mac or Ctrl+Z on a PC. There's the original and I'll press that shortcut again to show you the current version, quite a bit better. Now there is more to do to this image for sure, but at least I've removed that glaring yellow cast. Let me undo that again to talk about a completely different method, and that is the Average Color Method.

I'm going to make a copy of the single layer in the file by Ctrl+Clicking on the layer on a Mac or right-clicking on a PC and choosing Duplicate Layer. I'll say OK. With that duplicate layer selected I'm going to go to the Filter menu at the top of the screen and choose Blur and Average. That averages all the colors in the layer and gives me this kind of muddy brown. Now what I need to do is to get the complement of this color. To do that I'll go to the Image menu and down to Adjustments, and over to Invert or I could have just pressed the shortcut, Command+I on a Mac or Ctrl+I on a PC.

So the compliment of the muddy brown is just rather nice blue. Notice in the Layers panel that I have my photo on the Background layer and then I have that light blue on the layer above. I'm going to use a layer blending mode to blend the light blue with the photo. So with the light blue layer selected I'll go to the Layer Blending Mode at the top of the Layers panel and I'm going to go down and choose Overlay. And that's the result. I don't think it looks too bad. It's not perfect, but it's certainly better than the original.

I'll show you how that look to remind you by turning the Eye icon off next to the Background copy layer here. That was the original and this is the result of the Average method. If it's too much I can try a different blend mode like Soft Light, which brings back a little of the yellow and I can also vary the opacity of the Background copy layer. But for now I'm just going to take that Background copy layer and drag it to the trashcan at the bottom of the Layers panel, so I can show you one more quick and dirty method to remove a colorcast and that is to use the Gray Eyedropper that you'll find in both the Levels Adjustments panel and the Curves Adjustments panel.

So I'll go to the Levels icon here and click to open the Levels Adjustments panel and add a Levels adjustment layer in the Layers panel. There are 3 eyedroppers here as there are in Curves. I'm going to click the black eyedropper and with that I'm going to click on the area of the image that I want to be the darkest. I think that's right here and when I do that, that particular color is both turned to pure black and neutralized, so that it doesn't have any cast in it. I'm going to click the White eyedropper right here.

Now this is a little trickier and I may have to click a few different times but I'm going to try to click right on this white crack there and that's pretty close. So that removes any cast in the highlights, and if there's still a cast in the mid-tones, although there isn't much anymore, I'll get this gray eyedropper and I'll find an area that I think should be gray, perhaps somewhere over here. I'll have to click a few times to get just the look that I want but that just about does it. So now if I come back to the Layers panel and I click the Eye icon to the left of the Levels adjustment layer, you'll see how the image was and how it is now after applying the Black and White eyedropper to set the black and white points and neutralize those and then the Gray eyedropper to remove any color cast in the mid-tones.

So those are three quick and dirty methods for reducing colorcast in your images. I hope you give them all a try.

Find answers to the most frequently asked questions about Photoshop CS4 Essential Training.


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Q: How can artwork be transferred from Photoshop CS4 to Illustrator CS4 without the background?
A: Save the image in Photoshop’s native PSD format. The background in Photoshop must be transparent, meaning there should be no background layer. (To remove a background layer, move your artwork to a separate layer by selecting and copying the content, minus the background, to a new layer, and then delete the background layer. A checkboard pattern behind your image indicates transparent pixels.) 
 


In Illustrator, select File > Open, and select the PSD file. In Photoshop Import dialog box, select Convert Layers to Objects.

Q: How do I retouch an image I have of an old photograph I scanned?
A: There are a few courses that address image restoration. Check out the Photoshop CS4 Portrait Retouching Essential Training course, and for problems dealing specifically with old photographs, watch the Restoration movies in chapter 15 of the Enhancing Digital Photography with Photoshop CS2. Additionally, learn how to research and date photos with our Growing and Sharing Your Family Tree course.
Q: A client has asked for artwork to be delivered as JPEGs or BMP files in 16-bit format. In Photoshop CS4, there does not appear to be an option to save an image as a 16-bit JPEG. Is there a way to save JPEG files as 16-bit in Photoshop?
A: Unfortunately, JPEGs cannot be saved in 16 bit. JPEGs, by nature, are 8-bit. So if you open a high-bit image into Photoshop CS4, you will see no option in any of the save dialog boxes to save the file as a JPEG. You would first have to convert the image to 8 bit (by choosing Image > Mode > 8 bits/channel) and then save it as an 8-bit JPEG. If you open a high-bit image into Photoshop CS5, you will see the option to save it as a JPEG in the Save, Save As, and Save for Web dialog boxes.  But the JPEG will not be saved as 16-bit. Instead, Photoshop will downsample it to 8-bit for you  before saving it as JPEG.
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