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Working with Color nodes

From: Blender 2.48 Essential Training

Video: Working with Color nodes

Let's learn about the different color adjustment nodes in Blender that we can use to adjust and manipulate all of the colors in an image. First up let's go ahead and press F12. That should pull in this image of my daughter here and we are going to go ahead and adjust the colors a little bit. So let's get started with one of the simpler nodes, the Brightness/Contrast node. To thread that in let's click on the Image Input node and Add > Color > Brightness/Contrast and then we are going thread this output of the Brightness/Contrast node to our SplitViewer.

Working with Color nodes

Let's learn about the different color adjustment nodes in Blender that we can use to adjust and manipulate all of the colors in an image. First up let's go ahead and press F12. That should pull in this image of my daughter here and we are going to go ahead and adjust the colors a little bit. So let's get started with one of the simpler nodes, the Brightness/Contrast node. To thread that in let's click on the Image Input node and Add > Color > Brightness/Contrast and then we are going thread this output of the Brightness/Contrast node to our SplitViewer.

Just grab on a node header to drag it around. The Brightness/Contrast node works just by increasing the Brightness of one image and/or the Contrast. You can type the images input here or you can feed them through the Value node or a Mask node or anything else you want to use to automate the values that are placed in this node. That's what the Brightness/Contrast node does. The idea behind all of these nodes is that you have very simple computing unit and then you string all of these together.

The Inversion node takes the output of whatever threaded node is and inverts the values. This produces a negative of the image, go ahead and scale this down a little bit by pressing Ctrl and the middle mouse button. You can adjust the negatives of the RGB as well as the Alpha value of whatever is fed in. You can see here that this is actually a premultiplied Alpha PNG image with a transparent background. You often use the Inversion node to invert the Alpha channel, so when you are working with an image and you want to switch over the RGB Alpha channel, you can do that.

The Gamma Correction node takes the input image and does a Gamma correction. Usually you go to like 2.2 or something like that to do a complete Gamma correction that lifts all of the values in the image and/or darkens them depending on the value that you put in. I'm going to go ahead and compare the before and after images and that's obviously like a way too much Gamma correction depending on the monitor that you are using and your output format and everything you can do a little Gamma lift to bring out the flesh tones.

The RGB Curve is a really cool curve and it has this Curves Widget again that we can use to adjust the overall color. So if I wanted to, let's say bring out the highs and bring down the lows, basically increasing the contrast we can do that. I'm going to go ahead and slide this over a little bit. There we go. So, you can see what's going on down here. We posterized her colors. This is very similar to Photoshop and all those other packages that do that kind of manipulation.

We can also work on each individual channel. The Red channel here, I'm going to pop- up the Red's and maybe bring down the Green's a little bit and accentuate the Blue's.Let's say we want to knock all of the blues down by half and so, now we have done this very bright yellow, red color. She is on fire. We can also remap the bottom, what we call Black to be any kind of color or any shade of gray. So just by clicking on a preset here, I'm going to just pick a shade of gray.

Now I have brought down the overall blacks to what would be a medium gray on the input side is now actually black on the output side. So I can remap my dynamic range of brightness just by changing the black and the white levels. Next up we have the HSV node, which changes the Hue/Saturation and Value of an image, so we can just do Hue Adjustment and Image Adjustment here. I'm going to just go ahead and delete this, do a little housekeeping here, so you can see when I'm done. All right, so the Hue/Saturation and Value, we can shift the hues of an image, we can increase the saturation and we can decrease the overall values to make it darker, don't like that too much, maybe just touch a little bit.

So this is the way you can do adjustments. Now this has a Factor Input, so we can feed a Mask here and then apply this change to any portion of the image identified by the mask. Let's say if I want to bring out her blue eyes, I could just create a blue for the mask and then adjust the hue for her eyes. So that's the essential Color Adjustment nodes of how we can work on either the entire image or a portion of the image to adjust the color in pretty much anyway that we want.

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This video is part of

Image for Blender 2.48 Essential Training
Blender 2.48 Essential Training

131 video lessons · 25869 viewers

Roger Wickes
Author

 
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  1. 12m 5s
    1. Welcome
      1m 16s
    2. Using the exercise files
      58s
    3. Using Blender's full capabilities
      4m 16s
    4. Getting and installing Blender
      3m 8s
    5. Mouse and keyboard differences on the Mac
      2m 27s
  2. 1h 6m
    1. Blender oddities
      7m 38s
    2. Introducing the User Interface, Console, and Render windows
      3m 8s
    3. Configuring the desktop for an efficient workflow
      6m 27s
    4. Using the mouse and tablet on a PC or a Mac
      5m 7s
    5. Acquiring keyboard skills
      7m 38s
    6. Window panes and types
      7m 53s
    7. Exploring the default scene
      5m 53s
    8. Setting themes, UI colors, and user preferences
      4m 0s
    9. Understanding how to safeguard your data with autosave and backups
      6m 52s
    10. Appending and linking assets
      7m 27s
    11. Using the open-source movies and assets
      4m 18s
  3. 2h 7m
    1. Working with objects in 3D space
      6m 24s
    2. Navigating 3D views
      4m 23s
    3. Understanding Blender modes
      1m 51s
    4. Understanding meshes
      2m 8s
    5. Editing a mesh
      3m 28s
    6. Using the Mirror modifier
      2m 55s
    7. Working with Vertex groups
      2m 35s
    8. Using Bézier curves
      3m 52s
    9. Working with text objects
      5m 23s
    10. Using reference images
      3m 38s
    11. Modeling boots by extruding circles and joining meshes
      8m 59s
    12. Applying the Mirror modifier to duplicate the boot and rotate
      1m 58s
    13. Modeling a helmet with NURBS and the Boolean modifier
      7m 14s
    14. Modeling a belt and pants by making a compound object from multiple primitive objects
      3m 51s
    15. Modeling legs by using edge loops and the Knife tool
      6m 9s
    16. Modeling a chest and arms using edge loops
      5m 30s
    17. Stitching the shoulders and neck
      5m 13s
    18. Modeling hands with the Proportional Editing tool
      9m 4s
    19. Linking vertices to create knuckle joints
      4m 7s
    20. Reinforcing modeling basics to create the face, eyes, nose, and ears
      13m 6s
    21. Appending and linking assets
      3m 54s
    22. Sculpting basics
      3m 3s
    23. Using the Subsurf modifier to smooth
      2m 34s
    24. Parenting
      2m 7s
    25. Working with groups
      2m 1s
    26. Understanding the endless possibilities for editing mesh with modifiers
      2m 37s
    27. Duplicating objects using the Array modifier
      1m 54s
    28. Modeling a set
      7m 52s
  4. 39m 41s
    1. Lighting overview
      4m 25s
    2. Using the Omni lamp
      4m 50s
    3. Working with the Area lamp
      2m 57s
    4. Using the Spot lamp
      4m 9s
    5. Using the Sun, Sky, and Atmosphere lamps
      4m 51s
    6. Using the Hemisphere lamp
      2m 3s
    7. Working with Ambient and Radiosity lighting
      7m 34s
    8. Lighting with three-point and other multipoint lighting rigs
      5m 30s
    9. Understanding shadows
      3m 22s
  5. 1h 21m
    1. Realism overview
      2m 56s
    2. Creating a world in less than seven days
      6m 36s
    3. Applying ambient occlusion
      3m 47s
    4. Working with basic materials
      3m 24s
    5. Working with node materials
      4m 27s
    6. Applying Pipeline options
      2m 51s
    7. Painting vertices
      3m 13s
    8. Using shaders
      7m 59s
    9. Using mirrors
      4m 41s
    10. Working with transparency
      4m 28s
    11. Using halos
      2m 40s
    12. Simulating with Subsurface Scattering (SSS)
      4m 26s
    13. Applying textures
      9m 34s
    14. Mapping image textures to an object to create a decal
      4m 19s
    15. UV unwrapping
      4m 54s
    16. Applying multiple materials to a single object
      3m 31s
    17. Painting in 3D
      4m 14s
    18. Using bump maps
      3m 14s
  6. 1h 25m
    1. Understanding animation
      4m 14s
    2. Keyframing objects
      6m 15s
    3. Keyframing materials
      3m 14s
    4. Creating Shape keys
      2m 28s
    5. Creating Facial Shape key animation using reference video
      2m 12s
    6. Animating by combining Shape keys
      2m 53s
    7. Working with lattices
      3m 37s
    8. Using hooks
      1m 30s
    9. Working with Vertex groups
      2m 33s
    10. Creating armature objects
      3m 44s
    11. Mirroring armatures for bilateral creatures
      3m 43s
    12. Attaching mesh to the armature by way of skinning
      5m 7s
    13. Posing a character
      4m 43s
    14. Using inverse kinematics
      4m 29s
    15. Creating a walk cycle with inverse kinematics
      6m 34s
    16. Completing the walk cycle
      3m 49s
    17. Limiting range of motion and degrees of freedom
      3m 47s
    18. Managing actions using the Action Editor
      3m 52s
    19. Blending actions together using the Non-Linear Animation Editor
      4m 34s
    20. Tracking
      3m 2s
    21. Following a path
      2m 21s
    22. Mimicking an existing animation
      3m 47s
    23. Using the grease pencil
      2m 56s
  7. 50m 43s
    1. Understanding particle systems
      2m 20s
    2. Working with game engine physics
      3m 52s
    3. Spewing particles
      7m 25s
    4. Guiding particles
      3m 43s
    5. Creating reactions and collisions with particle systems
      3m 15s
    6. Creating hair and fur
      4m 25s
    7. Grooming hair and fur
      3m 26s
    8. Jiggling and squishing soft bodies
      3m 43s
    9. Simulating cloth
      6m 10s
    10. Simulating fluids
      5m 47s
    11. Using boids to simulate swarms, schools, and flocks
      6m 37s
  8. 21m 29s
    1. Using Render controls
      6m 18s
    2. Radiosity
      3m 31s
    3. Stamping text on video
      2m 32s
    4. Setting up test renders
      4m 43s
    5. Rendering image sequences
      4m 25s
  9. 1h 5m
    1. Viewing node thumbnail images on certain Macs
      1m 31s
    2. Overview and integration
      2m 12s
    3. Render passes and layers
      4m 27s
    4. Using Input nodes
      6m 22s
    5. Using Output nodes
      3m 54s
    6. Working with Color nodes
      4m 29s
    7. Color mixing and layering
      3m 27s
    8. Using Distort nodes individually and in combination
      7m 15s
    9. Using Vector nodes
      6m 46s
    10. Creating effects with Filter nodes
      8m 49s
    11. Using Converter nodes
      6m 7s
    12. Chroma keying with Matte nodes
      6m 15s
    13. Understanding node groups and reuse
      4m 17s
  10. 38m 43s
    1. The Video Sequence Editor (VSE)
      11m 47s
    2. Integrating audio
      3m 31s
    3. Using VSE Greenscreen and other plug-ins
      5m 40s
    4. Integrating the Compositor with the VSE
      7m 50s
    5. Layering and splicing video
      6m 18s
    6. Speeding up and slowing down sequences
      3m 37s
  11. 5m 26s
    1. Putting it all together: Captain Knowledge visits lynda.com
      5m 12s
    2. Goodbye
      14s

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