Reference

The glossary.

The 70 terms used across the v1 curriculum. Each definition is the same one that surfaces in the hover tooltips on concept, artist, exercise, and lesson pages — kept short for in-context reading.

Categories

Value and tone 10
Color 12
Edges 7
Light and form 10
Composition and design 8
Drawing and observation 5
Brushwork and mark-making 6
Process, method, and technique 6
Critique and diagnostic vocabulary 6

Value and tone10 terms

chiaroscuro: The strong contrast of light and dark used to model form and create drama.
halation: The slight luminous glow at the edge between a light and dark passage; a sign of optical fidelity.
massing: Grouping the painting into a small number of large value shapes; the foundation of strong composition.
notan: The Japanese-rooted design concept of pure light-and-dark pattern, independent of subject. Reduce the painting to three or four pure values and check whether the design works.
tenebrism: An extreme form of chiaroscuro in which most of the canvas is in deep shadow with only small lit passages.
value key: The overall location of a painting's values on the scale — high key (most values light), middle key, or low key (most values dark).
value pass: A diagnostic exercise: examining only the value structure of a work, ignoring color. Often done by squinting or converting the painting to black and white.
value plan: A small preparatory study (often three or four values) that establishes the value design before painting begins.
value range: The distance between the lightest and darkest tones in a work.
value structure: The underlying organization of values in a painting that gives it pictorial coherence.

Color12 terms

analogous colors: Colors adjacent on the color wheel; produce harmony but limited contrast.
broken color: Small, distinct strokes of varied color placed side-by-side rather than blended; central to Impressionism.
chroma: The intensity or saturation of a color, independent of value or hue.
color harmony: A pleasing relationship between colors in a painting, often guided by a deliberate scheme.
color note: A specific patch of color in a painting, especially in plein air practice — observed and placed.
color temperature: The relative warmness or coolness of a color, often the most powerful relationship in a painting.
complementary colors: Colors opposite on the color wheel (red/green, blue/orange, yellow/violet); produce maximum contrast and neutralize each other when mixed.
hue: The pure color identity (red, blue, yellow, etc.), independent of value or chroma.
limited palette: A working palette restricted to a small number of pigments (e.g., a Zorn palette of four colors). The classical discipline for developing color.
muddy color: A common error: color drained of chroma through over-mixing or unwanted complementary mixing.
saturation: Synonym for chroma — the intensity or purity of a color.
Zorn palette: A four-color limited palette (yellow ochre, vermilion or cadmium red, ivory black, white) associated with Anders Zorn.

Edges7 terms

edge variety: Deliberate variation between hard, soft, lost, and found edges throughout a painting.
found edge: An edge that emerges from a previously lost or undefined area, drawing the eye back.
hard edge: A sharp, distinct boundary between two shapes.
killing edge: Deliberately softening or eliminating an edge to subordinate that area in the composition.
lost edge: An edge that dissolves into an adjacent shape of similar value or color; a powerful focal-point tool.
sfumato: Leonardo's smoky transitions between values and edges; the supreme example of the soft and lost edge.
soft edge: A blended or gradual boundary between shapes.

Light and form10 terms

cast shadow: The shadow thrown by a form onto a surface separate from itself.
core shadow: The darkest band on a form, located just on the shadow side of the terminator.
form light: The lit side of a three-dimensional form.
form principle: The structured understanding of how light describes form: form light, halftone, core shadow, reflected light, cast shadow.
halftone: The transitional value between the form light and the core shadow.
key light: The primary, dominant light source on a subject.
occlusion shadow: The deepest shadow where two surfaces meet (e.g., where two objects touch); receives no reflected light.
reflected light: Light bouncing into the shadow side of a form from a nearby surface; lifts the shadow so it doesn't read as a black hole.
rim light: A bright edge of light along the silhouette of a back-lit subject.
terminator: The boundary between the lit and shadowed sides of a form.

Composition and design8 terms

balance: The distribution of visual weight across a composition.
dominant shape: The largest or most visually significant shape in a composition.
eye path: The route the viewer's eye travels through a painting, directed by the composition.
focal point: The primary point of visual interest in a composition.
golden section: The proportion (approximately 1:1.618) often used as a compositional guide.
negative space: The shapes between or around subjects; an active part of composition, equal in importance to positive space.
rule of thirds: A simple compositional guide placing the focal point on one of four intersections dividing the picture into thirds.
tangent: A pictorial error where two edges or contours meet exactly, flattening pictorial depth.

Drawing and observation5 terms

comparative measurement: Judging proportion by comparing one part of the subject to another, rather than measuring absolutely.
contour: The outer edge or outline of a form.
gesture: The underlying line of action, energy, or movement of a pose or composition.
plumb line: A vertical reference line used to check the alignment and angle of subject features.
sight-size: A method in which the drawing or painting is made the exact size of the subject as seen from the artist's position.

Brushwork and mark-making6 terms

alla prima: Wet-into-wet painting brought to completion in one session or pass. Also called direct painting or premier coup.
drag: A stroke pulled across the surface so that paint catches only on the high points of the weave; produces broken texture.
impasto: Thickly applied paint that stands proud of the surface.
painterly: A style emphasizing visible brushwork over polished surface.
premier coup: First-strike painting; an alla prima approach common in plein air and rapid study.
scumble: A semi-opaque, dragged layer of lighter or different-temperature paint over a dry layer; produces broken-color atmosphere.

Process, method, and technique6 terms

dead color: A neutral underpainting that establishes value structure before color is introduced.
fat over lean: The rule for oil layering: each successive layer should contain more oil than the one below to prevent cracking.
glazing: Building color through transparent layers over a dry underpainting.
grisaille: A monochrome (typically gray) underpainting on which color glazes are applied.
imprimatura: A thin transparent toned ground applied before drawing or painting begins.
scumbling: Applying a semi-opaque, broken layer over a dry layer below; a layering technique frequently paired with glazing.

Critique and diagnostic vocabulary6 terms

blown highlights: Highlights pushed past the value scale into pure white, losing modeling.
crushed shadows: A common error: shadow values mashed together with no internal separation.
edge pass: A diagnostic look only at the edge handling of a painting.
muddy: Color drained of chroma through over-mixing; a common error.
the eye exits the painting: A compositional flaw: the eye follows a line or gradient out of the picture and does not return.
twins: A pictorial error: two elements of equal size or weight competing for attention.

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