Computational analysis of the photograph of the artwork B Major - Research on Harmony - Variation 2 (AQC0692) [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 22 flat areas. The largest are dark grayish olive (13%), grayish yellow (12%) and moderate olive green (10%). Among the others, those that stand out most sharply from their surroundings are pale orange yellow at the bottom left (0.9%), pale yellow at the top left (3.9%) and grayish olive green at the top (0.1%). By colour name family: yellow 33%, olive 15%, gray 12%, olive green 10.0%, brown 5.1%, olive gray 3.9%, purple 3.7%, yellow brown 3.5%, blue 2.8%, olive brown 2.3%, green 2.1%, yellow green 1.9%, orange yellow 1.4% and reddish purple 1.3%.
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: 2043x2043 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 |
E1CFA5 |
pale orange yellow |
0.9Y 8.3/3.4 |
0.9% |
62.6 |
at the bottom left |
| 2 |
E2CB94 |
pale yellow |
2.8Y 8.2/4.4 |
3.9% |
41.5 |
at the top left |
| 3 |
474D31 |
grayish olive green |
4.8GY 3.1/2.5 |
0.1% |
40.1 |
at the top |
| 4 |
8E727F |
grayish purple |
5.0RP 5.0/2.6 |
2.8% |
37.9 |
at the top |
| 5 |
D2B94B |
strong yellow |
5.7Y 7.6/8.0 |
2.5% |
37.9 |
in the centre |
| 6 |
515B37 |
moderate olive green |
3.4GY 3.7/3.5 |
0.2% |
37.2 |
in the centre |
| 7 |
62809C |
grayish blue |
1.2PB 5.3/4.3 |
0.1% |
34.7 |
in the centre |
| 8 |
747066 |
light grayish olive |
0.6GY 4.7/1.3 |
9.2% |
28.1 |
on the right |
| 9 |
CBB27D |
grayish yellow |
3.1Y 7.3/4.5 |
6.3% |
27.1 |
on the right |
| 10 |
B69D47 |
dark yellow |
5.0Y 6.4/6.7 |
0.1% |
26.5 |
in the centre |
| 11 |
9194A6 |
pale purple |
9.1PB 6.1/2.4 |
5.3% |
25.0 |
at the bottom right |
| 12 |
D7C093 |
grayish yellow |
4.1Y 7.9/3.6 |
12% |
24.4 |
on the right |
| 13 |
D8CB49 |
brilliant greenish yellow |
7.5Y 8.1/8.7 |
7.0% |
22.9 |
in the centre |
| 14 |
6C8753 |
moderate yellow green |
6.7GY 5.1/4.4 |
0.2% |
22.9 |
in the centre |
| 15 |
405643 |
dark grayish green |
10.0GY 3.3/2.2 |
2.0% |
20.1 |
in the centre |
| 16 |
546042 |
moderate olive green |
6.4GY 3.9/3.1 |
10% |
18.3 |
at the top left |
| 17 |
AE9F4F |
dark yellow |
6.6Y 6.3/5.9 |
3.2% |
18.0 |
at the top |
| 18 |
36322B |
dark grayish olive |
0.6GY 2.1/0.9 |
13% |
16.1 |
at the bottom left |
| 19 |
B4882F |
dark yellow |
2.4Y 5.9/7.9 |
0.5% |
15.2 |
in the centre |
| 20 |
5B483C |
dark grayish yellow brown |
9.6YR 3.3/1.9 |
5.1% |
11.9 |
at the bottom |
| 21 |
716E70 |
purplish gray |
7.8P 4.6/1.3 |
10% |
10.4 |
at the bottom |
| 22 |
767833 |
moderate yellow green |
2.5GY 4.9/5.5 |
5.6% |
10.1 |
on the left |
Colour name families
| Family |
Area |
| yellow |
33% |
| olive |
15% |
| gray |
12% |
| olive green |
10.0% |
| brown |
5.1% |
| olive gray |
3.9% |
| purple |
3.7% |
| yellow brown |
3.5% |
| blue |
2.8% |
| olive brown |
2.3% |
| green |
2.1% |
| yellow green |
1.9% |
| orange yellow |
1.4% |
| reddish purple |
1.3% |
| violet |
1.0% |
| red |
0.6% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.2 |
| Mean Local Roughness |
0.015 |
| Roughness Uniformity |
0.025 |
| Edge Density |
0.051 |
| Mean Gradient Magnitude |
0.108 |
| Gradient Variance |
0.051 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.146 |
| Pattern Complexity |
0.114 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.654 |
| Spatial Variation |
0.132 |
| Texture Consistency |
0.638 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.504 |
| Brightness Variance |
0.2 |
| Brightness Uniformity |
0.602 |
| Brightness Skewness |
0.059 |
| Brightness Entropy |
7.221 |
| Rms Contrast |
0.2 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.716 |
| Mean Local Contrast |
0.015 |
| Contrast Uniformity |
0.0 |
| Dynamic Range |
0.996 |
| Effective Dynamic Range |
0.604 |
| Shadow Percentage |
22.247 |
| Midtone Percentage |
46.189 |
| Highlight Percentage |
31.564 |
| Shadow Clipping |
0.002 |
| Highlight Clipping |
0.0 |
| Tonal Balance |
0.0 |
| Fine Contrast |
0.008 |
| Medium Contrast |
0.02 |
| Coarse Contrast |
None |
| Multiscale Contrast Ratio |
1.0 |
| Edge Contrast |
0.108 |
| Contrast Clustering |
0.362 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.765 |
| Color Clustering |
0.619 |
| Color Transition Smoothness |
0.716 |
| Transition Uniformity |
0.66 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.157 |
| Mean Saturation |
0.311 |
| Saturation Variance |
0.033 |
| Low Saturation Ratio |
0.482 |
| Medium Saturation Ratio |
0.491 |
| High Saturation Ratio |
0.027 |
| Saturation Clustering |
0.999 |
| Hue Concentration |
0.923 |
| Complementary Balance |
0.007 |
| Analogous Dominance |
0.964 |
| Temperature Bias |
0.716 |
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.
