Color Grading Video Filter

Applies tonal color correction by independently adjusting the color balance of shadows, midtones, and highlights.
This filter allows precise control over the emotional tone, visual coherence, and stylistic identity of footage.

Color Grading does not correct exposure errors by itself; it reshapes how colors are distributed across tonal ranges.

What color grading is (and why it matters)

Color grading is the process of intentionally shaping color and tone to support mood, narrative, and visual consistency.

In cinema, it is a fundamental storytelling tool:

• Spaghetti westerns (e.g. Sergio Leone)
  Heavy warm highlights, cool or desaturated shadows, strong tonal separation
  → Emphasizes dust, heat, tension, and moral contrast

• Blade Runner (1982)
  Strong color bias in shadows and highlights (teal, amber, neon hues)
  → Reinforces atmosphere, futurism, and emotional isolation

• In the Mood for Love (2000)
  Selective midtone grading with warm chromatic bias and subdued highlights, combined with controlled shadow density
  → Supports a sense of closeness, repetition, and emotional tension without relying on overt contrast

In all cases, the look is not “natural”; it is designed.

Main controls

Each tonal range has the same control structure and behavior.

Shadows (Lift)

Affects dark areas of the image.

• Controls shadow color bias
• Influences perceived depth and mood
• Overuse can crush blacks or introduce color noise

Midtones (Gamma)

Affects mid-level brightness and color, where most image detail lives.

• Primary tool for skin tones
• Strongly affects overall look
• Small changes have large perceptual impact

Highlights (Gain)

Affects bright areas of the image.

• Controls highlight color cast
• Shapes perceived lighting temperature
• Can easily clip if pushed too far

Color wheel (common to all three)

Each tonal range uses an identical color wheel.

• The black dot in the middle represents neutral (no color bias)

• Moving the dot toward a color:

  • Pushes that color into the selected tonal range
  • Automatically adjusts the corresponding RGB values

Important behavior

• The wheel and R / G / B inputs are fully linked
• Changing one updates the others

Vertical bar (luminance strength)

The vertical bar next to each wheel controls the intensity of the adjustment.

• Top (white)
  Maximum influence

• Center (default)
  Balanced influence

• Bottom (black)
  Decreases luminance for the selected tonal range, resulting in darker output.

This bar directly affects the range and sensitivity of the RGB input fields.

RGB input fields (R / G / B)

Provide numerical control over the same adjustment defined by the wheel.

• The available range depends on the vertical bar position
• Default center position typically limits values to smaller ranges
• Moving the vertical bar expands or contracts the usable range

Important behavior

• RGB values do not represent absolute color
• They represent offsets applied to the selected tonal range

Note:

RGB inputs refine the wheel adjustment; they do not replace it.

Keyframes

All three tonal controls are keyframeable.

This enables:

• Gradual mood shifts
• Day-to-night color transitions
• Emotional emphasis tied to narrative beats

Visual characteristics

• Independent color control by tonal range
• No geometry or sharpness changes
• Can introduce stylized or cinematic looks
• Errors are more visible on skin tones and neutral areas

Recommended use cases

• Establishing a cinematic look
• Matching shots from different cameras
• Enhancing mood and atmosphere
• Stylized genre looks (western, noir, sci-fi)

Limitations

• Not a replacement for exposure correction
• Easy to overdo; subtlety is critical
• Can reveal noise in shadows
• Requires calibrated viewing for precision work