Computational analysis of the photograph of the artwork G Major - Research on Harmony - Variation 4 (AQC0837) [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 19 flat areas. The largest are pale yellow green (33%), pale yellow green (20%) and grayish yellow green (16%). Among the others, those that stand out most sharply from their surroundings are olive black in the centre (0.9%), moderate yellowish pink at the bottom right (0.2%) and dark orange yellow in the centre (9.1%). By colour name family: yellow green 65%, green 12%, gray 5.3%, yellow 4.8%, orange yellow 4.2%, brown 2.6%, olive brown 2.2% and olive 1.8%.
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: 2434x3246 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 (11).
| Rank |
Colour |
ISCC-NBS name |
Munsell |
Area |
Contrast |
Position |
| 1 |
27261A |
olive black |
0.6GY 1.4/0.9 |
0.9% |
44.2 |
in the centre |
| 2 |
C0D1AA |
pale yellow green |
6.5GY 8.2/2.8 |
33% |
24.7 |
at the top right |
| 3 |
DEB8A1 |
moderate yellowish pink |
5.7YR 7.8/3.1 |
0.2% |
21.2 |
at the bottom right |
| 4 |
BD8D32 |
dark orange yellow |
0.8Y 6.0/7.9 |
9.1% |
18.9 |
in the centre |
| 5 |
8C5F17 |
strong yellowish brown |
9.2YR 4.2/7.5 |
0.2% |
17.8 |
in the centre |
| 6 |
876829 |
light olive brown |
4.0Y 4.6/5.4 |
0.2% |
17.7 |
at the bottom |
| 7 |
966F19 |
light olive brown |
1.4Y 4.7/7.2 |
0.1% |
13.5 |
at the top |
| 8 |
906F25 |
light olive brown |
1.0Y 4.7/6.8 |
0.1% |
11.8 |
in the centre |
| 9 |
B8994D |
dark yellow |
3.2Y 6.5/6.5 |
0.9% |
11.4 |
at the top left |
| 10 |
95641D |
strong yellowish brown |
9.4YR 4.5/7.4 |
0.1% |
10.2 |
in the centre |
| 11 |
9E7418 |
light olive brown |
1.8Y 5.0/7.6 |
2.3% |
9.3 |
at the top |
| 12 |
906A1B |
light olive brown |
1.4Y 4.7/7.2 |
0.5% |
8.5 |
at the top |
| 13 |
929F96 |
greenish gray |
0.6G 6.2/0.8 |
0.2% |
8.1 |
at the bottom right |
| 14 |
97987E |
grayish yellow green |
4.6GY 6.2/2.4 |
0.4% |
7.7 |
at the bottom |
| 15 |
A0A083 |
grayish yellow green |
0.7GY 6.6/2.2 |
0.2% |
7.4 |
at the top |
| 16 |
BFC3A4 |
pale yellow green |
5.2GY 7.7/2.1 |
3.8% |
4.6 |
at the top left |
| 17 |
BAC1A4 |
pale yellow green |
5.2GY 7.7/2.1 |
20% |
2.1 |
on the left |
| 18 |
A4AD8A |
grayish yellow green |
4.9GY 6.8/2.3 |
9.7% |
1.6 |
at the bottom left |
| 19 |
ADBC98 |
grayish yellow green |
7.1GY 7.3/2.4 |
16% |
1.1 |
at the bottom right |
Colour name families
| Family |
Area |
| yellow green |
65% |
| green |
12% |
| gray |
5.3% |
| yellow |
4.8% |
| orange yellow |
4.2% |
| brown |
2.6% |
| olive brown |
2.2% |
| olive |
1.8% |
| white |
0.6% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.135 |
| Mean Local Roughness |
0.023 |
| Roughness Uniformity |
0.017 |
| Edge Density |
0.144 |
| Mean Gradient Magnitude |
0.189 |
| Gradient Variance |
0.036 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.004 |
| Pattern Complexity |
0.118 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.628 |
| Spatial Variation |
0.075 |
| Texture Consistency |
0.614 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.693 |
| Brightness Variance |
0.135 |
| Brightness Uniformity |
0.805 |
| Brightness Skewness |
-1.502 |
| Brightness Entropy |
6.897 |
| Rms Contrast |
0.135 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.37 |
| Mean Local Contrast |
0.025 |
| Contrast Uniformity |
0.342 |
| Dynamic Range |
1.0 |
| Effective Dynamic Range |
0.396 |
| Shadow Percentage |
1.952 |
| Midtone Percentage |
30.886 |
| Highlight Percentage |
67.161 |
| Shadow Clipping |
0.005 |
| Highlight Clipping |
0.0 |
| Tonal Balance |
0.0 |
| Fine Contrast |
0.013 |
| Medium Contrast |
0.031 |
| Coarse Contrast |
0.046 |
| Multiscale Contrast Ratio |
0.289 |
| Edge Contrast |
0.189 |
| Contrast Clustering |
0.386 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.706 |
| Color Clustering |
0.424 |
| Color Transition Smoothness |
0.537 |
| Transition Uniformity |
0.765 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.005 |
| Mean Saturation |
0.263 |
| Saturation Variance |
0.046 |
| Low Saturation Ratio |
0.81 |
| Medium Saturation Ratio |
0.088 |
| High Saturation Ratio |
0.102 |
| Saturation Clustering |
0.999 |
| Hue Concentration |
0.941 |
| Complementary Balance |
0.0 |
| Analogous Dominance |
0.996 |
| Temperature Bias |
0.337 |
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.
