Video Editing Color and Image Treatment Syllabus

Color and Image Treatment syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Color and Image Treatment in Video Editing, not a summary of it.

1. 1

   Color Theory for Editors

   2 topics

   • Color and Emotion
   • Color Models
2. 2

   Color Correction

   3 topics

   • Reading Scopes
   • Primary Corrections
   • Matching Shots
3. 3

   Color Grading

   4 topics

   • Secondary Color Grading
   • Creative Looks and Style
   • LUTs and Color Spaces
   • Node and Layer Grading
4. 4

   HDR and Delivery Color

   4 topics

   • SDR vs HDR
   • Rec. 709, Rec. 2020, and DCI-P3
   • Broadcast Safe Levels
   • Color Management Workflows

Color and Image Treatment flashcards for Video Editing

23 of 51 cards from the Color and Image Treatment deck — real questions with worked answers.

1. What is the difference between color correction and color grading?

   Color correction is the technical process of fixing problems and normalizing footage (balancing exposure, contrast, and white balance so the image looks accurate and neutral). Color grading is the creative process that follows, in which color is manipulated stylistically to establish mood, tone, and visual identity.

2. In color psychology for film, what emotions are typically associated with warm colors versus cool colors?

   Warm colors (red, orange, yellow) evoke energy, passion, comfort, danger, or intimacy. Cool colors (blue, green, cyan) evoke calm, sadness, isolation, coldness, or technology/sterility. Colorists exploit these associations to reinforce a scene's emotional intent.

3. What are the approximate color temperatures of tungsten light and daylight, and how does Kelvin value relate to the warmth of light?

   Tungsten light is approximately $3200\,\mathrm{K}$ and daylight is approximately $5600\,\mathrm{K}$. Counterintuitively, lower Kelvin values produce warmer (orange) light, while higher Kelvin values produce cooler (blue) light.

4. What is the RGB color model and what type of color mixing does it use?

   RGB is an additive color model used by displays and cameras, in which red, green, and blue light are combined. Adding all three primaries at full intensity produces white ($R + G + B = \text{white}$), and the absence of all three produces black.

5. What is a subtractive color model, and which primaries does it use?

   A subtractive model (CMY/CMYK, used in print) creates colors by absorbing (subtracting) wavelengths from reflected white light. Its primaries are cyan, magenta, and yellow, with black (K) added in printing; combining all subtractive primaries approaches black, the opposite of additive RGB.

6. What do the three components of the HSL color model represent?

   Hue: the base color, expressed as an angle from $0^{\circ}$ to $360^{\circ}$ on the color wheel. Saturation: the intensity or purity of the color, from gray to fully vivid. Lightness (or Luminance): how bright or dark the color is, from black to white.

7. What is the Y'CbCr color model and why is it used in video instead of raw RGB?

   Y'CbCr separates the image into luma (Y', brightness) and two chroma difference channels (Cb = blue-difference, Cr = red-difference). Because human vision is more sensitive to brightness than to color, the chroma channels can be subsampled to save bandwidth without visible quality loss.

8. State the Rec. 709 luma equation used to compute Y' from the gamma-corrected RGB primaries.

   $$Y' = 0.2126\,R' + 0.7152\,G' + 0.0722\,B'$$ Green contributes the most because the eye is most sensitive to green light, followed by red, then blue.

9. Compare the chroma subsampling schemes 4:4:4, 4:2:2, and 4:2:0.

   4:4:4: no subsampling — full color resolution for every pixel (best for keying/VFX). 4:2:2: chroma sampled at half horizontal resolution — professional acquisition/broadcast standard. 4:2:0: chroma sampled at half horizontal and half vertical resolution — used for delivery formats (e.g., H.264/HEVC streaming) with the smallest data footprint.

10. What does a waveform monitor display, and what is it primarily used for?

    A waveform monitor plots the brightness (luminance) of the image against its horizontal position, with signal level on the vertical axis. It is the primary tool for judging exposure, contrast, and checking that blacks and whites stay within legal levels.

11. What does a vectorscope display, and what is the significance of the skin tone line?

    A vectorscope plots hue (as angle around a circle) and saturation (as distance from center), independent of brightness. The skin tone line (roughly between the red and yellow targets, at about $10$–$11$ o'clock) marks the hue where all human skin tones should fall regardless of complexion; deviation indicates a color cast on skin.

12. What does an RGB parade scope show, and how is it used to detect a color cast?

    An RGB parade shows three side-by-side waveforms, one for each of the red, green, and blue channels. In neutral areas (grays, whites, blacks) all three channels should align at the same level; if one channel sits noticeably higher or lower, the image has a color cast in that channel (e.g., elevated blue in shadows = blue cast).

13. What does a histogram show in color grading, and how do you recognize clipping on it?

    A histogram plots the number of pixels (vertical axis) at each brightness level (horizontal axis), showing overall tonal distribution. Clipping appears as a tall spike pressed against the far left edge (crushed blacks) or far right edge (blown highlights), meaning detail has been lost.

14. What is an IRE unit on a video scope?

    IRE (Institute of Radio Engineers) is a relative unit of video signal amplitude where $0\ \mathrm{IRE}$ = reference black and $100\ \mathrm{IRE}$ = reference white, so $1\ \mathrm{IRE} = 1\%$ of the black-to-white signal range. Waveform monitors are commonly scaled in IRE.

15. What is a primary color correction?

    A primary correction is an adjustment applied to the entire image at once — exposure, contrast, white balance, and saturation across all pixels — as opposed to a secondary correction, which affects only an isolated portion of the image. Primaries are performed first to normalize the shot.

16. What is the recommended order of operations when performing primary correction on a shot?

    1) Set exposure and contrast — establish black point, white point, and mid-tone brightness (using the waveform). 2) Correct white balance/color casts — neutralize whites and blacks (using the RGB parade). 3) Adjust saturation to a natural level (using the vectorscope). Tone before color, correction before creative grading.

17. In the Lift–Gamma–Gain color wheel model, which tonal range does each control affect?

    Lift adjusts the shadows (its influence is strongest at black and tapers toward white). Gamma adjusts the mid-tones. Gain adjusts the highlights (strongest at white). All three overlap smoothly rather than affecting hard-cut ranges.

18. Mathematically, how do lift, gain, and gamma each transform a pixel value $x$ (normalized $0$ to $1$)?

    Gain multiplies the signal: $y = g \cdot x$ (pivots at black). Lift adds an offset weighted toward shadows: $y = x + l\,(1 - x)$ (pivots at white). Gamma applies a power function to mid-tones: $y = x^{\frac{1}{\gamma}}$, leaving black ($0$) and white ($1$) unchanged.

19. How do you correct white balance using a neutral reference in the image?

    Find something that should be truly neutral (white, gray, or black) and adjust temperature/tint or the color wheels until its red, green, and blue levels are equal on the RGB parade. Alternatively, use the white-balance eyedropper on the neutral area; equal $R = G = B$ in neutrals means the cast is removed.

20. What is shot matching and why is it essential in a color grading workflow?

    Shot matching is adjusting every shot in a scene so exposure, contrast, and color balance are consistent from cut to cut, even when shots came from different cameras, lenses, or lighting conditions. It preserves visual continuity so the audience isn't pulled out of the story by jarring color shifts between edits.

21. Describe the hero-shot method for matching shots within a scene.

    Grade one representative shot of the scene first (the "hero" or reference shot), then compare every other shot against it using split-screen/gallery comparison and scopes, adjusting each until it matches. This gives a single objective target rather than matching shots to each other in a chain.

22. How are scopes used to match two shots objectively rather than by eye?

    Display both shots' RGB parades/waveforms and align their key values: match the black points, white points, and mid-tone levels of each channel, then confirm skin tones fall on the same vectorscope angle and saturation. Scopes remove the bias of eye adaptation and uncalibrated perception.

23. What is secondary color grading?

    Secondary grading is any correction limited to an isolated part of the image — selected by hue/saturation/luminance qualification, masks (power windows), or a combination — rather than the whole frame. Examples: adjusting only the sky, only skin tones, or only one object's color.

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