Computational analysis of the photograph of the artwork Eb minor - Reflexions 2 (AQC0436) [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 47 flat areas. The largest are light greenish gray (69%), grayish blue (3.1%) and pale orange yellow (2.9%). Among the others, those that stand out most sharply from their surroundings are grayish brown on the right (0.1%), dark blue on the right (0.7%) and blackish blue on the left (0.3%). By colour name family: gray 60%, blue 25%, pink 2.5%, orange yellow 1.8%, green 1.7%, brown 1.5%, olive gray 1.4% and red 1.2%.
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: 1536x2048 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 (6).
| Rank |
Colour |
ISCC-NBS name |
Munsell |
Area |
Contrast |
Position |
| 1 |
493D30 |
grayish brown |
5.7YR 2.6/1.5 |
0.1% |
43.5 |
on the right |
| 2 |
1A2D44 |
dark blue |
4.5PB 1.8/3.6 |
0.7% |
38.5 |
on the right |
| 3 |
252728 |
blackish blue |
7.9PB 1.4/1.0 |
0.3% |
37.0 |
on the left |
| 4 |
E7BE7E |
pale orange yellow |
0.5Y 7.8/5.8 |
2.9% |
35.9 |
in the centre |
| 5 |
454B4F |
dark greenish gray |
6.6BG 3.1/0.7 |
0.2% |
35.9 |
on the right |
| 6 |
4A545E |
dark bluish gray |
1.6PB 3.5/1.3 |
0.1% |
24.0 |
in the centre |
| 7 |
535B61 |
dark bluish gray |
1.7PB 3.8/1.3 |
0.1% |
22.5 |
in the centre |
| 8 |
573C2E |
moderate brown |
6.9YR 2.7/2.7 |
0.1% |
22.4 |
in the centre |
| 9 |
2E4356 |
dark grayish blue |
9.6B 2.7/2.8 |
0.1% |
22.2 |
on the left |
| 10 |
A38830 |
dark yellow |
5.1Y 5.8/6.7 |
0.1% |
22.1 |
on the right |
| 11 |
9A9243 |
dark greenish yellow |
8.7Y 5.9/5.8 |
0.1% |
21.6 |
on the right |
| 12 |
A09340 |
dark yellow |
6.6Y 6.0/5.9 |
0.1% |
21.0 |
on the right |
| 13 |
284054 |
dark grayish blue |
9.6B 2.7/2.8 |
0.3% |
19.2 |
at the top right |
| 14 |
AF7766 |
grayish reddish orange |
9.8R 5.3/5.0 |
0.9% |
18.1 |
in the centre |
| 15 |
904D48 |
grayish red |
4.8R 4.0/6.6 |
0.8% |
17.9 |
at the top |
| 16 |
4A545E |
dark bluish gray |
1.6PB 3.5/1.3 |
0.1% |
17.8 |
in the centre |
| 17 |
CA9C98 |
moderate pink |
2.9R 6.8/4.4 |
2.1% |
17.3 |
in the centre |
| 18 |
586063 |
dark greenish gray |
7.5BG 4.1/0.7 |
0.1% |
17.3 |
on the right |
| 19 |
89817C |
light brownish gray |
9.6YR 5.5/0.9 |
0.1% |
16.0 |
at the bottom left |
| 20 |
6C7C88 |
grayish blue |
2.4PB 5.0/2.8 |
0.6% |
15.6 |
on the right |
| 21 |
4F6472 |
grayish blue |
9.9B 4.0/3.0 |
1.4% |
15.3 |
on the left |
| 22 |
9FA3A7 |
light greenish gray |
9.1BG 6.6/0.6 |
69% |
14.6 |
in the centre |
| 23 |
442722 |
dark grayish reddish brown |
8.9R 1.8/2.9 |
0.2% |
14.5 |
at the top |
| 24 |
878285 |
medium gray |
N 5.4/ |
0.8% |
14.0 |
on the left |
| 25 |
2A3C50 |
dark blue |
4.3PB 2.5/3.5 |
0.3% |
13.4 |
at the top |
| 26 |
303D4A |
dark blue |
4.9PB 2.5/2.2 |
0.2% |
11.8 |
at the top |
| 27 |
5D758F |
grayish blue |
2.7PB 4.7/3.9 |
2.0% |
11.7 |
at the bottom |
| 28 |
6F7F89 |
grayish blue |
2.4PB 5.0/2.8 |
3.1% |
11.5 |
in the centre |
| 29 |
949FA4 |
pale blue |
2.5PB 6.3/1.5 |
1.8% |
11.4 |
in the centre |
| 30 |
283F5E |
dark blue |
5.5PB 2.5/4.5 |
0.1% |
11.3 |
at the bottom |
| 31 |
707E8D |
grayish blue |
5.2PB 5.1/2.5 |
0.1% |
11.1 |
at the bottom right |
| 32 |
D69C95 |
moderate yellowish pink |
6.7R 6.9/5.0 |
0.4% |
10.4 |
in the centre |
| 33 |
898D81 |
light olive gray |
0.7GY 5.7/0.6 |
2.7% |
10.1 |
at the top left |
| 34 |
342A28 |
dark grayish reddish brown |
8.3R 1.9/0.6 |
0.6% |
9.8 |
at the top |
| 35 |
495E6F |
grayish blue |
2.1PB 3.8/2.6 |
1.9% |
9.8 |
at the top |
| 36 |
677874 |
grayish green |
9.7G 4.9/2.0 |
0.7% |
8.2 |
at the top left |
| 37 |
708091 |
grayish blue |
2.5PB 5.3/2.8 |
0.1% |
7.9 |
at the bottom |
| 38 |
989A9A |
medium gray |
N 6.3/ |
0.6% |
7.3 |
on the right |
| 39 |
B2B1AD |
yellowish gray |
0.8GY 7.2/0.5 |
0.1% |
6.1 |
on the right |
| 40 |
8A979E |
pale blue |
2.5PB 6.0/1.5 |
0.4% |
5.9 |
on the right |
| 41 |
8C8E8A |
medium gray |
N 5.7/ |
0.3% |
5.4 |
on the right |
| 42 |
A8A6A6 |
pinkish gray |
2.5R 6.7/0.8 |
0.3% |
4.7 |
in the centre |
| 43 |
616567 |
dark gray |
N 4.2/ |
0.3% |
4.7 |
at the top left |
| 44 |
A9ACAD |
light gray |
N 6.9/ |
0.3% |
4.4 |
on the right |
| 45 |
B2C2D0 |
very pale blue |
3.0PB 7.8/2.9 |
0.1% |
4.1 |
at the bottom right |
| 46 |
A4A8A8 |
light greenish gray |
9.2BG 6.9/0.6 |
0.3% |
2.3 |
on the right |
| 47 |
A1A6A9 |
light purplish gray |
9.3PB 6.7/1.3 |
0.1% |
1.2 |
on the right |
Colour name families
| Family |
Area |
| gray |
60% |
| blue |
25% |
| pink |
2.5% |
| orange yellow |
1.8% |
| green |
1.7% |
| brown |
1.5% |
| olive gray |
1.4% |
| red |
1.2% |
| yellow |
1.0% |
| olive |
0.7% |
| purple |
0.7% |
| orange |
0.7% |
| yellow green |
0.5% |
| black |
0.5% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.145 |
| Mean Local Roughness |
0.017 |
| Roughness Uniformity |
0.018 |
| Edge Density |
0.052 |
| Mean Gradient Magnitude |
0.146 |
| Gradient Variance |
0.041 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.005 |
| Pattern Complexity |
0.112 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.615 |
| Spatial Variation |
0.078 |
| Texture Consistency |
0.661 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.588 |
| Brightness Variance |
0.145 |
| Brightness Uniformity |
0.753 |
| Brightness Skewness |
-0.919 |
| Brightness Entropy |
7.085 |
| Rms Contrast |
0.145 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.466 |
| Mean Local Contrast |
0.019 |
| Contrast Uniformity |
0.0 |
| Dynamic Range |
1.0 |
| Effective Dynamic Range |
0.494 |
| Shadow Percentage |
6.469 |
| Midtone Percentage |
60.035 |
| Highlight Percentage |
33.496 |
| Shadow Clipping |
0.001 |
| Highlight Clipping |
0.0 |
| Tonal Balance |
0.0 |
| Fine Contrast |
0.008 |
| Medium Contrast |
0.024 |
| Coarse Contrast |
0.038 |
| Multiscale Contrast Ratio |
0.219 |
| Edge Contrast |
0.146 |
| Contrast Clustering |
0.339 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.719 |
| Color Clustering |
0.618 |
| Color Transition Smoothness |
0.624 |
| Transition Uniformity |
0.718 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.002 |
| Mean Saturation |
0.123 |
| Saturation Variance |
0.02 |
| Low Saturation Ratio |
0.886 |
| Medium Saturation Ratio |
0.108 |
| High Saturation Ratio |
0.006 |
| Saturation Clustering |
1.0 |
| Hue Concentration |
0.217 |
| Complementary Balance |
0.179 |
| Analogous Dominance |
0.597 |
| Temperature Bias |
-0.199 |
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.
