Computational analysis of the photograph of the artwork D7 - Research on Harmony - Variations 4 (AQC1147) [1] by Arnaud Quercy [2], according to IDS-CMP-2025 [3], on an image 1000 pixels on its longer side, on 2026-10-07. 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 18 flat areas. The largest are moderate orange (36%), grayish blue (12%) and strong brown (11%). Among the others, those that stand out most sharply from their surroundings are grayish yellow at the bottom right (4.6%), blackish green in the centre (4.4%) and vivid reddish orange at the bottom (2.7%). By colour name family: orange 34%, brown 15%, blue 15%, yellow 7.5%, pink 7.3%, green 6.5%, black 4.3%, gray 4.0%, orange yellow 3.1% and yellow green 1.1%.
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: 1150x1477 pixels. Analysis date: 2026-10-07.
A) Color Analysis
Flat areas
Ranked by contrast with their surroundings (CIEDE2000). Strokes thinner than 10 pixels are excluded (1).
| Rank |
Colour |
ISCC-NBS name |
Munsell |
Area |
Contrast |
Position |
| 1 |
B0A578 |
grayish yellow |
3.7Y 6.7/3.2 |
4.6% |
54.7 |
at the bottom right |
| 2 |
0F1F16 |
blackish green |
3.2G 0.8/1.9 |
4.4% |
45.2 |
in the centre |
| 3 |
FE6200 |
vivid reddish orange |
0.6YR 6.0/16.1 |
2.7% |
43.4 |
at the bottom |
| 4 |
5F5E61 |
dark bluish gray |
8.5PB 3.9/1.0 |
0.8% |
39.7 |
at the top |
| 5 |
BE8101 |
dark orange yellow |
0.5Y 5.8/9.9 |
0.8% |
36.2 |
in the centre |
| 6 |
417F27 |
strong yellow green |
7.8GY 4.6/8.1 |
3.0% |
35.4 |
on the right |
| 7 |
C1A486 |
light yellowish brown |
8.2YR 6.8/3.6 |
2.6% |
31.8 |
in the centre |
| 8 |
5D6573 |
grayish blue |
5.0PB 4.1/2.3 |
12% |
31.1 |
at the bottom |
| 9 |
0E0A09 |
black |
N 0.3/ |
4.7% |
30.7 |
at the bottom right |
| 10 |
B1381D |
deep reddish orange |
9.6R 4.2/11.9 |
1.3% |
29.8 |
at the top left |
| 11 |
953B01 |
strong brown |
2.4YR 3.6/9.8 |
11% |
29.5 |
in the centre |
| 12 |
F49B66 |
moderate orange |
3.4YR 7.1/9.1 |
36% |
26.9 |
at the top |
| 13 |
BDC601 |
strong greenish yellow |
1.8GY 7.5/10.7 |
1.2% |
25.3 |
on the right |
| 14 |
444D5D |
grayish blue |
5.0PB 3.2/2.1 |
5.5% |
23.4 |
at the bottom right |
| 15 |
FCCAA8 |
light yellowish pink |
4.3YR 8.5/4.4 |
2.3% |
18.2 |
at the top |
| 16 |
C9BF85 |
grayish yellow |
4.8Y 7.6/4.1 |
2.5% |
17.7 |
at the top left |
| 17 |
714C34 |
moderate brown |
5.0YR 3.6/4.1 |
3.6% |
17.6 |
on the right |
| 18 |
393B16 |
dark olive |
0.6GY 2.4/3.7 |
0.3% |
17.4 |
in the centre |
Colour name families
| Family |
Area |
| orange |
34% |
| brown |
15% |
| blue |
15% |
| yellow |
7.5% |
| pink |
7.3% |
| green |
6.5% |
| black |
4.3% |
| gray |
4.0% |
| orange yellow |
3.1% |
| yellow green |
1.1% |
| olive |
0.7% |
| olive black |
0.5% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.216 |
| Mean Local Roughness |
0.012 |
| Roughness Uniformity |
0.017 |
| Edge Density |
0.019 |
| Mean Gradient Magnitude |
0.075 |
| Gradient Variance |
0.025 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.147 |
| Pattern Complexity |
0.126 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.618 |
| Spatial Variation |
0.152 |
| Texture Consistency |
0.478 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.495 |
| Brightness Variance |
0.216 |
| Brightness Uniformity |
0.562 |
| Brightness Skewness |
-0.408 |
| Brightness Entropy |
7.201 |
| Rms Contrast |
0.216 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.691 |
| Mean Local Contrast |
0.011 |
| Contrast Uniformity |
0.0 |
| Dynamic Range |
0.976 |
| Effective Dynamic Range |
0.714 |
| Shadow Percentage |
26.434 |
| Midtone Percentage |
45.421 |
| Highlight Percentage |
28.145 |
| Shadow Clipping |
0.013 |
| Highlight Clipping |
0.0 |
| Tonal Balance |
0.0 |
| Fine Contrast |
0.007 |
| Medium Contrast |
0.014 |
| Coarse Contrast |
None |
| Multiscale Contrast Ratio |
1.0 |
| Edge Contrast |
0.075 |
| Contrast Clustering |
0.522 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.747 |
| Color Clustering |
0.55 |
| Color Transition Smoothness |
0.794 |
| Transition Uniformity |
0.829 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.143 |
| Mean Saturation |
0.542 |
| Saturation Variance |
0.073 |
| Low Saturation Ratio |
0.223 |
| Medium Saturation Ratio |
0.477 |
| High Saturation Ratio |
0.3 |
| Saturation Clustering |
0.999 |
| Hue Concentration |
0.675 |
| Complementary Balance |
0.108 |
| Analogous Dominance |
0.806 |
| Temperature Bias |
0.633 |
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.
