Computational analysis of the photograph of the artwork E Major - Research on Harmony (AQC0591) [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 25 flat areas. The largest are moderate blue (58%), brilliant yellow green (9.5%) and vivid yellow (9.1%). Among the others, those that stand out most sharply from their surroundings are black at the top (0.6%), brilliant greenish yellow at the top (1.6%) and grayish yellow at the top (0.3%). By colour name family: blue 70%, yellow 14%, yellow green 9.7%, green 2.6% and pink 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: 2617x3489 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 (4).
| Rank |
Colour |
ISCC-NBS name |
Munsell |
Area |
Contrast |
Position |
| 1 |
1A1613 |
black |
N 0.7/ |
0.6% |
72.8 |
at the top |
| 2 |
E4D35E |
brilliant greenish yellow |
7.4Y 8.4/8.1 |
1.6% |
55.1 |
at the top |
| 3 |
D1B87B |
grayish yellow |
3.6Y 7.6/5.0 |
0.3% |
53.1 |
at the top |
| 4 |
A3C965 |
brilliant yellow green |
6.4GY 7.6/8.0 |
9.5% |
47.1 |
on the right |
| 5 |
F1BD2B |
vivid yellow |
1.9Y 7.9/11.0 |
9.1% |
41.6 |
on the left |
| 6 |
66B775 |
brilliant yellowish green |
1.4G 6.6/7.4 |
0.3% |
41.5 |
in the centre |
| 7 |
65B05A |
brilliant yellowish green |
9.9GY 6.5/8.8 |
1.9% |
39.2 |
in the centre |
| 8 |
565B6F |
grayish blue |
5.0PB 3.8/2.2 |
5.1% |
37.1 |
at the bottom |
| 9 |
EED3CF |
pale yellowish pink |
0.3YR 8.6/2.3 |
0.7% |
35.8 |
at the top left |
| 10 |
6AAE72 |
moderate yellowish green |
1.0G 6.4/6.3 |
0.2% |
35.3 |
at the top left |
| 11 |
2F4060 |
dark blue |
4.3PB 2.8/4.6 |
0.7% |
34.6 |
in the centre |
| 12 |
376DA1 |
moderate blue |
4.1PB 4.4/8.5 |
58% |
33.5 |
in the centre |
| 13 |
E8D797 |
pale yellow |
3.4Y 8.5/4.8 |
3.3% |
31.3 |
in the centre |
| 14 |
4689BC |
moderate blue |
1.6PB 5.5/8.1 |
0.2% |
28.8 |
in the centre |
| 15 |
BEABAA |
grayish pink |
2.3R 7.1/1.6 |
0.4% |
26.0 |
on the left |
| 16 |
78B0D2 |
light blue |
0.3PB 7.0/6.1 |
2.9% |
24.6 |
at the top left |
| 17 |
5585AD |
moderate blue |
2.3PB 5.2/6.6 |
0.9% |
24.6 |
at the top left |
| 18 |
F5CC2F |
brilliant yellow |
4.2Y 8.3/10.9 |
0.3% |
23.9 |
at the top right |
| 19 |
171F2F |
dark blue |
5.1PB 1.0/2.4 |
0.1% |
22.0 |
at the bottom |
| 20 |
E7B47D |
pale orange yellow |
8.4YR 7.6/5.8 |
0.4% |
15.9 |
in the centre |
| 21 |
5F643E |
moderate olive green |
3.5GY 4.0/3.4 |
0.1% |
15.0 |
in the centre |
| 22 |
418FD3 |
brilliant blue |
4.5PB 5.6/10.8 |
1.4% |
14.1 |
at the top |
| 23 |
79B852 |
brilliant yellowish green |
8.1GY 6.9/9.1 |
0.5% |
12.3 |
on the right |
| 24 |
6F91BB |
light blue |
3.2PB 5.9/6.5 |
0.5% |
6.9 |
on the right |
| 25 |
5291B7 |
light blue |
9.2B 5.7/6.2 |
0.2% |
2.9 |
at the bottom |
Colour name families
| Family |
Area |
| blue |
70% |
| yellow |
14% |
| yellow green |
9.7% |
| green |
2.6% |
| pink |
1.1% |
| black |
0.6% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.178 |
| Mean Local Roughness |
0.015 |
| Roughness Uniformity |
0.029 |
| Edge Density |
0.048 |
| Mean Gradient Magnitude |
0.115 |
| Gradient Variance |
0.08 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.253 |
| Pattern Complexity |
0.112 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.637 |
| Spatial Variation |
0.079 |
| Texture Consistency |
0.555 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.489 |
| Brightness Variance |
0.178 |
| Brightness Uniformity |
0.635 |
| Brightness Skewness |
0.51 |
| Brightness Entropy |
6.966 |
| Rms Contrast |
0.178 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.572 |
| Mean Local Contrast |
0.016 |
| Contrast Uniformity |
0.0 |
| Dynamic Range |
1.0 |
| Effective Dynamic Range |
0.498 |
| Shadow Percentage |
11.886 |
| Midtone Percentage |
63.62 |
| Highlight Percentage |
24.493 |
| Shadow Clipping |
0.005 |
| Highlight Clipping |
0.001 |
| Tonal Balance |
0.0 |
| Fine Contrast |
0.009 |
| Medium Contrast |
0.021 |
| Coarse Contrast |
None |
| Multiscale Contrast Ratio |
1.0 |
| Edge Contrast |
0.115 |
| Contrast Clustering |
0.445 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.75 |
| Color Clustering |
0.374 |
| Color Transition Smoothness |
0.695 |
| Transition Uniformity |
0.456 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.26 |
| Mean Saturation |
0.593 |
| Saturation Variance |
0.028 |
| Low Saturation Ratio |
0.081 |
| Medium Saturation Ratio |
0.709 |
| High Saturation Ratio |
0.21 |
| Saturation Clustering |
0.999 |
| Hue Concentration |
0.505 |
| Complementary Balance |
0.064 |
| Analogous Dominance |
0.709 |
| Temperature Bias |
-0.552 |
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.
