Computational analysis of the photograph of the artwork A Major - Research on Harmony (AQC0647) [1] by Arnaud Quercy [2], according to IDS-CMP-2025 [3], on an image 1000 pixels on its longer side, on 2025-10-03. Each colour is located in the Munsell system and named according to the ISCC-NBS system (267 names, National Bureau of Standards, 1976). The image divides into 15 flat areas. The largest are strong orange (40%), strong yellow (21%) and dark bluish green (17%). Among the others, those that stand out most sharply from their surroundings are dark grayish olive in the centre (1.7%), olive black at the top (0.2%) and white at the top left (0.4%). By colour name family: orange 24%, green 24%, yellow 22%, orange yellow 16%, black 4.9%, olive black 2.7%, gray 1.8%, olive 1.4% and brown 1.0%.
Context
Analysis performed according to IDS-CMP-2025 [3]: (a) colours named by Munsell and ISCC-NBS, areas and flat areas, (b) texture, (c) brightness and contrast, (d) spatial distribution. Source image: 1984x2976 pixels. Analysis date: 2025-10-03.
A) Color Analysis
Flat areas
Ranked by contrast with their surroundings (CIEDE2000). Strokes thinner than 10 pixels are excluded (14).
| Rank |
Colour |
ISCC-NBS name |
Munsell |
Area |
Contrast |
Position |
| 1 |
3E392B |
dark grayish olive |
0.6GY 2.5/1.7 |
1.7% |
57.5 |
in the centre |
| 2 |
1C1912 |
olive black |
0.6GY 1.0/0.9 |
0.2% |
46.7 |
at the top |
| 3 |
DCD9D6 |
white |
1.0GY 8.7/0.5 |
0.4% |
45.5 |
at the top left |
| 4 |
D3CDC1 |
yellowish gray |
8.2YR 8.2/0.8 |
2.2% |
45.2 |
at the bottom left |
| 5 |
14100B |
olive black |
0.6GY 0.6/0.7 |
0.5% |
40.3 |
in the centre |
| 6 |
83440E |
strong brown |
5.1YR 3.6/8.0 |
0.2% |
33.4 |
at the bottom right |
| 7 |
275753 |
dark bluish green |
6.3BG 3.2/3.4 |
17% |
28.9 |
on the left |
| 8 |
14110C |
olive black |
0.6GY 0.6/0.7 |
6.7% |
27.0 |
on the left |
| 9 |
4F9B97 |
light bluish green |
4.8BG 5.8/5.1 |
6.3% |
19.6 |
at the top left |
| 10 |
EAC22B |
strong yellow |
4.0Y 8.0/10.6 |
21% |
15.4 |
in the centre |
| 11 |
A6A74C |
dark greenish yellow |
0.8GY 6.5/6.2 |
0.1% |
13.7 |
at the top |
| 12 |
A9AC4E |
moderate greenish yellow |
0.8GY 6.8/6.7 |
1.5% |
13.6 |
at the top |
| 13 |
EC9319 |
strong orange |
6.9YR 6.8/11.9 |
40% |
12.0 |
on the right |
| 14 |
D99920 |
strong orange yellow |
9.9YR 6.8/10.5 |
0.1% |
4.1 |
at the bottom |
| 15 |
ED9119 |
strong orange |
6.9YR 6.8/11.9 |
0.1% |
1.9 |
at the bottom right |
Colour name families
| Family |
Area |
| orange |
24% |
| green |
24% |
| yellow |
22% |
| orange yellow |
16% |
| black |
4.9% |
| olive black |
2.7% |
| gray |
1.8% |
| olive |
1.4% |
| brown |
1.0% |
| yellow green |
0.8% |
| white |
0.7% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.218 |
| Mean Local Roughness |
0.024 |
| Roughness Uniformity |
0.032 |
| Edge Density |
0.077 |
| Mean Gradient Magnitude |
0.184 |
| Gradient Variance |
0.099 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.02 |
| Pattern Complexity |
0.115 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.644 |
| Spatial Variation |
0.164 |
| Texture Consistency |
0.463 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.537 |
| Brightness Variance |
0.218 |
| Brightness Uniformity |
0.593 |
| Brightness Skewness |
-0.861 |
| Brightness Entropy |
7.17 |
| Rms Contrast |
0.218 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.708 |
| Mean Local Contrast |
0.025 |
| Contrast Uniformity |
0.0 |
| Dynamic Range |
1.0 |
| Effective Dynamic Range |
0.718 |
| Shadow Percentage |
23.995 |
| Midtone Percentage |
47.533 |
| Highlight Percentage |
28.471 |
| Shadow Clipping |
0.045 |
| Highlight Clipping |
0.015 |
| Tonal Balance |
0.0 |
| Fine Contrast |
0.013 |
| Medium Contrast |
0.033 |
| Coarse Contrast |
0.049 |
| Multiscale Contrast Ratio |
0.263 |
| Edge Contrast |
0.184 |
| Contrast Clustering |
0.537 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.751 |
| Color Clustering |
0.628 |
| Color Transition Smoothness |
0.531 |
| Transition Uniformity |
0.325 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.028 |
| Mean Saturation |
0.711 |
| Saturation Variance |
0.053 |
| Low Saturation Ratio |
0.065 |
| Medium Saturation Ratio |
0.305 |
| High Saturation Ratio |
0.629 |
| Saturation Clustering |
0.997 |
| Hue Concentration |
0.584 |
| Complementary Balance |
0.006 |
| Analogous Dominance |
0.748 |
| Temperature Bias |
0.487 |
Methodology
Computational analysis of a photograph of the artwork, reduced to 1,000 pixels on its longer side and filtered by a 3×3 median to remove grain. Colours: each pixel (sRGB rounded to 5 bits per channel) receives its Munsell notation and ISCC-NBS name from a table computed once from published data (Munsell renotation; ISCC-NBS blocks, NBS Special Publication 440, 1976), never from the artworks. Flat areas: connected regions of one name, merged with their neighbours while the CIEDE2000 difference between their mean colours stays below 10; an area is kept from 0.05% of the image; contrast with the surroundings measured 4 to 12 pixels from the edge. Texture: intensity standard deviation, local standard deviation, edge density (Canny), local binary patterns. Brightness: mean, variance, RMS, Michelson and local contrast, shadow / midtone / highlight distribution. Distribution: spatial coherence, transitions, saturation. Methods are deterministic and reproducible. Limits: the measurement concerns the photograph, including its lighting and white balance; two neighbouring areas less than 10 apart are merged.
