Computational analysis of the photograph of the artwork F Major - Research on Harmony - Variation 2 (AQC0735) [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 dark blue (17%), moderate red (15%) and vivid red (11%). Among the others, those that stand out most sharply from their surroundings are bluish black at the bottom right (7.0%), very pale blue at the bottom (3.4%) and pale yellow on the left (0.8%). By colour name family: red 30%, blue 18%, yellow 12%, pink 7.8%, orange yellow 7.2%, purple 6.7%, black 6.2%, gray 4.9% and brown 4.3%.
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: 3024x4032 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 (3).
| Rank |
Colour |
ISCC-NBS name |
Munsell |
Area |
Contrast |
Position |
| 1 |
0B0A12 |
bluish black |
7.8PB 0.3/0.6 |
7.0% |
66.4 |
at the bottom right |
| 2 |
BEC7C8 |
very pale blue |
2.9PB 7.8/1.6 |
3.4% |
45.0 |
at the bottom |
| 3 |
B31C36 |
vivid red |
4.9R 3.9/13.1 |
11% |
41.8 |
at the bottom |
| 4 |
E0D2B6 |
pale yellow |
2.0Y 8.5/2.4 |
0.8% |
40.7 |
on the left |
| 5 |
BEA865 |
moderate yellow |
6.1Y 6.9/5.3 |
0.6% |
37.8 |
on the left |
| 6 |
BAC4C4 |
light greenish gray |
9.7BG 7.8/0.6 |
2.5% |
36.6 |
at the bottom right |
| 7 |
CBB490 |
light grayish yellowish brown |
9.9YR 7.4/3.0 |
1.0% |
35.8 |
at the bottom left |
| 8 |
2D3445 |
dark blue |
4.9PB 2.1/2.3 |
17% |
33.8 |
on the left |
| 9 |
EBCDC8 |
light pink |
2.2R 8.4/3.1 |
2.1% |
32.7 |
at the bottom left |
| 10 |
EBC7E3 |
very light purple |
8.9P 8.3/5.6 |
9.6% |
27.2 |
at the top right |
| 11 |
D93D3F |
vivid red |
6.4R 4.9/14.5 |
0.4% |
25.9 |
at the bottom left |
| 12 |
9E4F56 |
moderate red |
2.8R 4.2/7.3 |
3.0% |
25.3 |
on the left |
| 13 |
E0C4A4 |
pale orange yellow |
7.7YR 8.1/3.5 |
4.8% |
24.9 |
at the top right |
| 14 |
AA3F45 |
moderate red |
4.4R 4.1/10.3 |
15% |
23.8 |
at the top |
| 15 |
8C413A |
grayish red |
7.8R 3.7/6.5 |
1.2% |
23.4 |
in the centre |
| 16 |
7E7C4B |
light olive |
0.7GY 5.0/3.7 |
0.1% |
23.1 |
at the bottom right |
| 17 |
BA7C4B |
moderate orange |
5.1YR 5.7/6.9 |
0.5% |
23.0 |
at the bottom left |
| 18 |
E7C8ED |
very pale purple |
6.2P 8.5/4.8 |
0.2% |
19.0 |
at the bottom |
| 19 |
98714A |
moderate yellowish brown |
8.1YR 5.1/4.8 |
3.0% |
18.0 |
in the centre |
| 20 |
CFA23E |
strong yellow |
2.9Y 6.8/8.3 |
8.7% |
15.6 |
in the centre |
| 21 |
E2C293 |
pale orange yellow |
0.2Y 8.0/4.4 |
1.2% |
14.1 |
on the right |
| 22 |
D07948 |
moderate orange |
2.6YR 6.0/9.0 |
0.2% |
9.1 |
at the bottom |
| 23 |
D9C3A0 |
pale orange yellow |
9.7YR 8.0/3.0 |
5.6% |
8.2 |
on the right |
| 24 |
C88F47 |
dark orange yellow |
7.6YR 6.2/8.1 |
0.2% |
6.8 |
at the bottom |
| 25 |
BDC9C7 |
light greenish gray |
6.9G 8.0/1.1 |
0.1% |
1.7 |
at the bottom right |
Colour name families
| Family |
Area |
| red |
30% |
| blue |
18% |
| yellow |
12% |
| pink |
7.8% |
| orange yellow |
7.2% |
| purple |
6.7% |
| black |
6.2% |
| gray |
4.9% |
| brown |
4.3% |
| orange |
0.9% |
| green |
0.5% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.261 |
| Mean Local Roughness |
0.026 |
| Roughness Uniformity |
0.026 |
| Edge Density |
0.113 |
| Mean Gradient Magnitude |
0.192 |
| Gradient Variance |
0.073 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.012 |
| Pattern Complexity |
0.123 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.646 |
| Spatial Variation |
0.179 |
| Texture Consistency |
0.534 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.477 |
| Brightness Variance |
0.261 |
| Brightness Uniformity |
0.453 |
| Brightness Skewness |
0.037 |
| Brightness Entropy |
7.596 |
| Rms Contrast |
0.261 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.825 |
| Mean Local Contrast |
0.027 |
| Contrast Uniformity |
0.0 |
| Dynamic Range |
1.0 |
| Effective Dynamic Range |
0.788 |
| Shadow Percentage |
34.855 |
| Midtone Percentage |
31.612 |
| Highlight Percentage |
33.533 |
| Shadow Clipping |
0.032 |
| Highlight Clipping |
0.002 |
| Tonal Balance |
0.267 |
| Fine Contrast |
0.015 |
| Medium Contrast |
0.034 |
| Coarse Contrast |
0.045 |
| Multiscale Contrast Ratio |
0.33 |
| Edge Contrast |
0.192 |
| Contrast Clustering |
0.466 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.736 |
| Color Clustering |
0.757 |
| Color Transition Smoothness |
0.513 |
| Transition Uniformity |
0.494 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.015 |
| Mean Saturation |
0.46 |
| Saturation Variance |
0.059 |
| Low Saturation Ratio |
0.309 |
| Medium Saturation Ratio |
0.516 |
| High Saturation Ratio |
0.176 |
| Saturation Clustering |
0.998 |
| Hue Concentration |
0.47 |
| Complementary Balance |
0.201 |
| Analogous Dominance |
0.712 |
| Temperature Bias |
0.486 |
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.
