Computational analysis of the photograph of the artwork F minor - Research on Harmony - Variation 5 (AQC0599) [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 12 flat areas. The largest are moderate yellowish pink (47%), very dark purplish red (33%) and dark violet (7.8%). Among the others, those that stand out most sharply from their surroundings are strong reddish brown in the centre (0.4%), brownish orange in the centre (0.9%) and pale yellowish pink on the left (4.3%). By colour name family: pink 45%, red 34%, purple 6.1%, blue 5.8%, gray 3.4%, reddish purple 1.4%, brown 1.2% and violet 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: 2599x3264 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 |
201E30 |
dark violet |
0.4P 1.2/3.1 |
7.8% |
46.6 |
on the left |
| 2 |
D29992 |
moderate yellowish pink |
6.7R 6.9/5.0 |
47% |
44.7 |
at the top |
| 3 |
9E1D09 |
strong reddish brown |
9.5R 3.3/11.8 |
0.4% |
32.1 |
in the centre |
| 4 |
B25827 |
brownish orange |
3.1YR 4.8/9.7 |
0.9% |
24.6 |
in the centre |
| 5 |
3B1E2E |
very dark purplish red |
8.3RP 1.5/3.2 |
33% |
21.6 |
at the bottom |
| 6 |
D9CAC6 |
pale yellowish pink |
3.0YR 8.3/1.5 |
4.3% |
21.6 |
on the left |
| 7 |
B49078 |
light brown |
6.3YR 6.3/3.2 |
0.1% |
16.6 |
in the centre |
| 8 |
888085 |
reddish gray |
3.3R 5.5/0.7 |
1.2% |
9.7 |
at the bottom left |
| 9 |
393D44 |
dark bluish gray |
8.2PB 2.5/1.0 |
1.0% |
6.4 |
at the bottom left |
| 10 |
9E6F6C |
grayish red |
3.9R 5.0/4.3 |
1.9% |
5.6 |
at the top right |
| 11 |
E6C6C3 |
light pink |
2.3R 8.1/3.1 |
0.6% |
5.1 |
at the top |
| 12 |
6B5B63 |
grayish purple |
3.1RP 4.0/1.7 |
2.0% |
4.7 |
at the bottom left |
Colour name families
| Family |
Area |
| pink |
45% |
| red |
34% |
| purple |
6.1% |
| blue |
5.8% |
| gray |
3.4% |
| reddish purple |
1.4% |
| brown |
1.2% |
| violet |
1.1% |
| orange |
1.0% |
| white |
0.6% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.254 |
| Mean Local Roughness |
0.019 |
| Roughness Uniformity |
0.024 |
| Edge Density |
0.083 |
| Mean Gradient Magnitude |
0.133 |
| Gradient Variance |
0.044 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.161 |
| Pattern Complexity |
0.145 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.677 |
| Spatial Variation |
0.215 |
| Texture Consistency |
0.285 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.447 |
| Brightness Variance |
0.254 |
| Brightness Uniformity |
0.432 |
| Brightness Skewness |
-0.102 |
| Brightness Entropy |
7.155 |
| Rms Contrast |
0.254 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.818 |
| Mean Local Contrast |
0.019 |
| Contrast Uniformity |
0.0 |
| Dynamic Range |
1.0 |
| Effective Dynamic Range |
0.659 |
| Shadow Percentage |
42.522 |
| Midtone Percentage |
29.365 |
| Highlight Percentage |
28.113 |
| Shadow Clipping |
0.0 |
| Highlight Clipping |
0.002 |
| Tonal Balance |
0.0 |
| Fine Contrast |
0.01 |
| Medium Contrast |
0.023 |
| Coarse Contrast |
None |
| Multiscale Contrast Ratio |
1.0 |
| Edge Contrast |
0.133 |
| Contrast Clustering |
0.715 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.76 |
| Color Clustering |
0.805 |
| Color Transition Smoothness |
0.658 |
| Transition Uniformity |
0.718 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.172 |
| Mean Saturation |
0.354 |
| Saturation Variance |
0.018 |
| Low Saturation Ratio |
0.34 |
| Medium Saturation Ratio |
0.649 |
| High Saturation Ratio |
0.011 |
| Saturation Clustering |
1.0 |
| Hue Concentration |
0.852 |
| Complementary Balance |
0.001 |
| Analogous Dominance |
0.908 |
| Temperature Bias |
0.891 |
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.
