Computational analysis of the photograph of the artwork D Major - Research on Harmony - Variation 4 (AQC0699) [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 23 flat areas. The largest are deep orange yellow (31%), dark olive brown (14%) and brownish orange (12%). Among the others, those that stand out most sharply from their surroundings are light yellowish brown on the right (0.2%), moderate yellowish green in the centre (0.3%) and moderate orange at the bottom right (2.6%). By colour name family: orange yellow 31%, brown 20%, orange 18%, yellow 8.7%, black 5.6%, olive brown 4.3%, olive black 4.2%, yellow brown 2.6%, olive 1.7%, green 1.5% and olive green 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: 2548x2548 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 (0).
| Rank |
Colour |
ISCC-NBS name |
Munsell |
Area |
Contrast |
Position |
| 1 |
201C17 |
dark olive brown |
1.2Y 1.1/1.0 |
14% |
50.4 |
on the right |
| 2 |
DAAD74 |
light yellowish brown |
8.5YR 7.3/5.9 |
0.2% |
40.0 |
on the right |
| 3 |
5A8B55 |
moderate yellowish green |
9.4GY 5.3/5.9 |
0.3% |
32.1 |
in the centre |
| 4 |
E69366 |
moderate orange |
3.3YR 6.7/8.1 |
2.6% |
30.9 |
at the bottom right |
| 5 |
324E34 |
dark yellowish green |
9.6GY 2.9/3.3 |
0.5% |
30.6 |
in the centre |
| 6 |
A67F23 |
light olive brown |
2.0Y 5.3/7.5 |
0.2% |
29.2 |
in the centre |
| 7 |
3E682A |
dark yellowish green |
8.4GY 4.0/6.6 |
0.4% |
28.4 |
on the right |
| 8 |
315A3E |
dark yellowish green |
0.9G 3.5/4.4 |
0.5% |
28.1 |
at the top right |
| 9 |
55412E |
moderate olive brown |
1.9Y 3.0/2.7 |
11% |
27.1 |
in the centre |
| 10 |
5B7227 |
moderate olive green |
5.2GY 4.4/6.5 |
0.9% |
25.3 |
at the top right |
| 11 |
E78A1B |
strong orange |
6.5YR 6.5/11.7 |
1.2% |
21.7 |
on the right |
| 12 |
2D2F22 |
dark grayish olive |
0.6GY 1.7/0.9 |
0.5% |
21.7 |
at the bottom right |
| 13 |
506325 |
moderate olive green |
4.4GY 3.9/5.4 |
0.1% |
20.1 |
in the centre |
| 14 |
D5B57A |
grayish yellow |
1.4Y 7.4/4.9 |
0.2% |
19.5 |
in the centre |
| 15 |
A6781E |
light olive brown |
2.2Y 5.3/7.9 |
2.1% |
16.1 |
on the right |
| 16 |
A55E2A |
brownish orange |
4.0YR 4.6/7.9 |
12% |
15.3 |
at the bottom left |
| 17 |
DB8753 |
moderate orange |
2.6YR 6.3/8.9 |
6.1% |
14.5 |
at the top right |
| 18 |
D4B576 |
moderate yellow |
2.1Y 7.4/5.4 |
3.6% |
14.3 |
on the left |
| 19 |
B69A75 |
dark grayish yellow |
1.5Y 6.4/3.6 |
1.6% |
12.6 |
at the bottom right |
| 20 |
A97419 |
strong yellowish brown |
9.2YR 5.2/8.6 |
0.9% |
11.3 |
at the top right |
| 21 |
AF8D5F |
light yellowish brown |
0.7Y 5.9/4.6 |
2.7% |
10.9 |
at the top right |
| 22 |
B69662 |
light yellowish brown |
0.7Y 6.2/4.6 |
6.7% |
10.9 |
at the top |
| 23 |
CD891D |
deep orange yellow |
9.3YR 6.2/10.0 |
31% |
10.5 |
on the left |
Colour name families
| Family |
Area |
| orange yellow |
31% |
| brown |
20% |
| orange |
18% |
| yellow |
8.7% |
| black |
5.6% |
| olive brown |
4.3% |
| olive black |
4.2% |
| yellow brown |
2.6% |
| olive |
1.7% |
| green |
1.5% |
| olive green |
1.0% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.181 |
| Mean Local Roughness |
0.006 |
| Roughness Uniformity |
0.015 |
| Edge Density |
0.006 |
| Mean Gradient Magnitude |
0.041 |
| Gradient Variance |
0.018 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.358 |
| Pattern Complexity |
0.094 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.629 |
| Spatial Variation |
0.135 |
| Texture Consistency |
0.349 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.461 |
| Brightness Variance |
0.181 |
| Brightness Uniformity |
0.608 |
| Brightness Skewness |
-0.816 |
| Brightness Entropy |
6.679 |
| Rms Contrast |
0.181 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.804 |
| Mean Local Contrast |
0.006 |
| Contrast Uniformity |
0.0 |
| Dynamic Range |
0.969 |
| Effective Dynamic Range |
0.561 |
| Shadow Percentage |
22.389 |
| Midtone Percentage |
72.513 |
| Highlight Percentage |
5.098 |
| Shadow Clipping |
0.0 |
| Highlight Clipping |
0.0 |
| Tonal Balance |
0.0 |
| Fine Contrast |
0.004 |
| Medium Contrast |
0.008 |
| Coarse Contrast |
None |
| Multiscale Contrast Ratio |
1.0 |
| Edge Contrast |
0.041 |
| Contrast Clustering |
0.651 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.758 |
| Color Clustering |
0.573 |
| Color Transition Smoothness |
0.882 |
| Transition Uniformity |
0.874 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.343 |
| Mean Saturation |
0.615 |
| Saturation Variance |
0.054 |
| Low Saturation Ratio |
0.089 |
| Medium Saturation Ratio |
0.451 |
| High Saturation Ratio |
0.461 |
| Saturation Clustering |
1.0 |
| Hue Concentration |
0.972 |
| Complementary Balance |
0.0 |
| Analogous Dominance |
0.977 |
| Temperature Bias |
0.955 |
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.
