Computational analysis of the photograph of the artwork D Minor - Research on Harmony - Variation 2 (AQC0755) [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 26 flat areas. The largest are moderate orange yellow (16%), yellowish gray (15%) and strong orange yellow (15%). Among the others, those that stand out most sharply from their surroundings are black at the bottom right (9.4%), strong yellow at the bottom right (1.2%) and black in the centre (0.2%). By colour name family: orange 23%, gray 22%, orange yellow 17%, yellow 10%, black 9.4%, brown 9.2% and red 8.0%.
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: 2968x3958 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 (10).
| Rank |
Colour |
ISCC-NBS name |
Munsell |
Area |
Contrast |
Position |
| 1 |
1A1A1A |
black |
N 1.0/ |
9.4% |
47.2 |
at the bottom right |
| 2 |
D1A435 |
strong yellow |
2.0Y 6.9/9.2 |
1.2% |
46.8 |
at the bottom right |
| 3 |
272322 |
black |
N 1.4/ |
0.2% |
38.9 |
in the centre |
| 4 |
E2C6A0 |
pale orange yellow |
7.7YR 8.1/3.5 |
0.4% |
38.4 |
at the bottom |
| 5 |
452928 |
dark grayish reddish brown |
7.6R 2.1/2.2 |
0.2% |
35.0 |
in the centre |
| 6 |
7A462A |
strong brown |
2.7YR 3.5/5.6 |
2.7% |
34.9 |
at the bottom |
| 7 |
913C39 |
moderate red |
5.7R 3.7/8.0 |
0.9% |
31.4 |
on the right |
| 8 |
A28132 |
dark yellow |
3.2Y 5.6/6.6 |
0.6% |
31.2 |
in the centre |
| 9 |
913C53 |
moderate purplish red |
9.6RP 3.8/8.1 |
1.8% |
30.7 |
on the left |
| 10 |
943C56 |
moderate purplish red |
9.6RP 3.8/8.1 |
5.5% |
29.0 |
on the right |
| 11 |
B37349 |
brownish orange |
4.0YR 5.4/6.6 |
3.1% |
25.6 |
on the right |
| 12 |
93433C |
dark reddish orange |
7.6R 3.9/7.3 |
0.3% |
24.3 |
on the left |
| 13 |
B0AA9E |
yellowish gray |
2.6Y 7.0/1.3 |
1.7% |
21.4 |
at the bottom |
| 14 |
B0A89A |
yellowish gray |
2.6Y 7.0/1.3 |
5.4% |
21.0 |
at the top left |
| 15 |
B78439 |
dark orange yellow |
9.9YR 5.7/7.1 |
1.9% |
20.5 |
on the left |
| 16 |
CA9D31 |
strong yellow |
1.6Y 6.6/8.8 |
9.0% |
19.3 |
at the bottom |
| 17 |
EACBB1 |
light yellowish pink |
5.5YR 8.4/3.0 |
0.6% |
19.2 |
in the centre |
| 18 |
B1ACA2 |
yellowish gray |
8.9YR 7.0/0.8 |
15% |
18.2 |
at the bottom left |
| 19 |
DF992F |
strong orange yellow |
9.6YR 6.8/10.1 |
15% |
12.6 |
in the centre |
| 20 |
DD802A |
strong orange |
5.5YR 6.2/10.8 |
1.6% |
9.9 |
at the top right |
| 21 |
DC9952 |
moderate orange yellow |
7.6YR 6.8/8.0 |
16% |
9.5 |
at the top right |
| 22 |
E87F12 |
strong orange |
3.7YR 6.3/13.2 |
5.6% |
7.7 |
at the top left |
| 23 |
B17348 |
brownish orange |
4.0YR 5.4/6.6 |
0.1% |
4.3 |
on the right |
| 24 |
C59F87 |
moderate yellowish pink |
4.2YR 6.6/3.8 |
0.1% |
1.6 |
on the left |
| 25 |
E57E13 |
strong orange |
4.3YR 6.1/12.7 |
0.2% |
1.4 |
at the top |
| 26 |
1A1916 |
olive black |
0.6GY 1.0/0.9 |
0.3% |
0.5 |
at the bottom right |
Colour name families
| Family |
Area |
| orange |
23% |
| gray |
22% |
| orange yellow |
17% |
| yellow |
10% |
| black |
9.4% |
| brown |
9.2% |
| red |
8.0% |
| pink |
0.8% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.194 |
| Mean Local Roughness |
0.017 |
| Roughness Uniformity |
0.015 |
| Edge Density |
0.081 |
| Mean Gradient Magnitude |
0.165 |
| Gradient Variance |
0.042 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.009 |
| Pattern Complexity |
0.12 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.593 |
| Spatial Variation |
0.146 |
| Texture Consistency |
0.535 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.542 |
| Brightness Variance |
0.194 |
| Brightness Uniformity |
0.643 |
| Brightness Skewness |
-1.289 |
| Brightness Entropy |
6.857 |
| Rms Contrast |
0.194 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.799 |
| Mean Local Contrast |
0.021 |
| Contrast Uniformity |
0.092 |
| Dynamic Range |
1.0 |
| Effective Dynamic Range |
0.627 |
| Shadow Percentage |
17.097 |
| Midtone Percentage |
55.762 |
| Highlight Percentage |
27.14 |
| Shadow Clipping |
0.001 |
| Highlight Clipping |
0.0 |
| Tonal Balance |
0.0 |
| Fine Contrast |
0.008 |
| Medium Contrast |
0.026 |
| Coarse Contrast |
0.044 |
| Multiscale Contrast Ratio |
0.189 |
| Edge Contrast |
0.165 |
| Contrast Clustering |
0.465 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.767 |
| Color Clustering |
0.459 |
| Color Transition Smoothness |
0.584 |
| Transition Uniformity |
0.72 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.01 |
| Mean Saturation |
0.485 |
| Saturation Variance |
0.096 |
| Low Saturation Ratio |
0.324 |
| Medium Saturation Ratio |
0.396 |
| High Saturation Ratio |
0.28 |
| Saturation Clustering |
0.999 |
| Hue Concentration |
0.96 |
| Complementary Balance |
0.0 |
| Analogous Dominance |
0.993 |
| Temperature Bias |
0.999 |
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.
