Computational analysis of the photograph of the artwork B minor - Reflexions 6 (AQC0441) [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 61 flat areas. The largest are moderate olive brown (16%), moderate reddish brown (8.6%) and light grayish reddish brown (8.6%). Among the others, those that stand out most sharply from their surroundings are moderate yellowish pink in the centre (0.1%), dark grayish yellow brown in the centre (0.8%) and pale orange yellow on the left (0.6%). By colour name family: brown 41%, olive brown 10%, orange yellow 9.4%, orange 9.3%, olive 8.0%, pink 6.9%, gray 4.8%, olive gray 3.5% and red 2.7%.
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 (7).
| Rank |
Colour |
ISCC-NBS name |
Munsell |
Area |
Contrast |
Position |
| 1 |
E9AE90 |
moderate yellowish pink |
0.6YR 7.5/5.6 |
0.1% |
56.7 |
in the centre |
| 2 |
352312 |
dark grayish yellow brown |
0.0Y 1.5/2.0 |
0.8% |
43.2 |
in the centre |
| 3 |
C9B8A6 |
pale orange yellow |
0.6Y 7.6/2.1 |
0.6% |
39.8 |
on the left |
| 4 |
42311C |
dark olive brown |
1.9Y 2.3/2.9 |
0.3% |
39.3 |
on the right |
| 5 |
F8AC6E |
light orange |
4.9YR 7.6/8.5 |
0.2% |
36.7 |
in the centre |
| 6 |
ECA43F |
strong orange yellow |
8.5YR 7.2/10.2 |
1.7% |
33.8 |
at the bottom |
| 7 |
190904 |
dark brown |
6.9YR 0.5/1.1 |
0.5% |
33.3 |
at the top |
| 8 |
F7B67F |
light orange |
6.0YR 7.7/6.9 |
0.5% |
29.8 |
on the left |
| 9 |
C18E62 |
light brown |
4.9YR 6.2/5.8 |
3.6% |
27.8 |
at the top right |
| 10 |
37210D |
dark olive brown |
1.9Y 1.5/2.5 |
0.3% |
27.2 |
at the top |
| 11 |
D67E47 |
moderate orange |
3.4YR 6.0/9.4 |
0.1% |
26.8 |
at the bottom |
| 12 |
735639 |
moderate brown |
6.9YR 3.8/3.4 |
0.1% |
26.1 |
at the top right |
| 13 |
E0B176 |
moderate orange yellow |
9.2YR 7.6/6.3 |
6.4% |
24.9 |
at the top left |
| 14 |
725D66 |
grayish purple |
5.6RP 4.1/2.3 |
0.1% |
24.6 |
on the left |
| 15 |
9A856E |
light grayish yellowish brown |
8.8YR 5.6/2.7 |
4.0% |
24.1 |
in the centre |
| 16 |
555C5D |
dark greenish gray |
7.2BG 3.8/0.7 |
1.6% |
23.7 |
at the bottom right |
| 17 |
442F08 |
dark yellowish brown |
0.1Y 2.0/4.0 |
0.1% |
23.5 |
at the top right |
| 18 |
A93421 |
deep reddish orange |
8.5R 3.9/11.6 |
1.2% |
23.2 |
at the top |
| 19 |
D78F20 |
deep orange yellow |
8.1YR 6.3/10.3 |
2.2% |
22.2 |
in the centre |
| 20 |
A64B31 |
dark reddish orange |
9.9R 4.2/8.5 |
2.6% |
21.8 |
at the top |
| 21 |
4E524C |
dark greenish gray |
0.0G 3.4/1.1 |
3.2% |
21.1 |
at the bottom |
| 22 |
B79781 |
light grayish reddish brown |
3.3YR 6.3/2.9 |
8.6% |
19.6 |
at the bottom left |
| 23 |
44310B |
dark olive brown |
3.9Y 2.2/3.9 |
0.1% |
18.5 |
at the top right |
| 24 |
816A76 |
grayish purple |
5.3RP 4.7/2.5 |
0.3% |
18.1 |
in the centre |
| 25 |
ECAA89 |
moderate yellowish pink |
2.4YR 7.5/5.9 |
0.5% |
16.8 |
in the centre |
| 26 |
D1A784 |
moderate yellowish pink |
4.7YR 7.0/4.8 |
5.3% |
16.0 |
at the top right |
| 27 |
969079 |
light grayish olive |
0.7GY 6.0/1.7 |
6.6% |
15.9 |
at the bottom right |
| 28 |
975322 |
strong brown |
4.9YR 4.2/7.5 |
7.1% |
15.7 |
at the top |
| 29 |
A0878A |
light grayish purplish red |
6.6RP 5.7/3.3 |
0.2% |
14.8 |
on the left |
| 30 |
D0723C |
strong orange |
2.7YR 5.8/10.1 |
0.3% |
14.8 |
at the top left |
| 31 |
A17B5C |
light brown |
6.6YR 5.4/4.3 |
0.1% |
14.1 |
on the right |
| 32 |
5A5674 |
grayish violet |
0.7P 3.7/4.0 |
0.1% |
14.1 |
in the centre |
| 33 |
4F3117 |
dark yellowish brown |
0.4Y 2.4/3.9 |
0.1% |
13.9 |
at the top |
| 34 |
715A32 |
moderate olive brown |
1.8Y 4.0/3.9 |
16% |
13.9 |
on the right |
| 35 |
A2875C |
light yellowish brown |
9.7YR 5.6/4.2 |
0.1% |
13.3 |
at the bottom |
| 36 |
51300D |
dark yellowish brown |
9.1YR 2.5/4.8 |
0.1% |
13.0 |
at the top right |
| 37 |
89725B |
grayish yellowish brown |
8.9YR 4.9/2.8 |
0.2% |
12.3 |
in the centre |
| 38 |
9A8055 |
dark grayish yellow |
2.6Y 5.5/4.2 |
0.4% |
12.0 |
in the centre |
| 39 |
B8685F |
moderate reddish orange |
8.3R 5.3/7.3 |
0.1% |
11.9 |
at the bottom left |
| 40 |
766857 |
grayish olive |
5.3Y 4.5/2.0 |
0.1% |
11.9 |
in the centre |
| 41 |
E89C6D |
moderate orange |
3.3YR 7.0/8.0 |
0.1% |
11.6 |
in the centre |
| 42 |
25190E |
dark olive |
4.1Y 1.0/1.7 |
0.7% |
11.6 |
on the left |
| 43 |
B09565 |
light yellowish brown |
0.7Y 6.2/4.6 |
0.1% |
11.5 |
at the bottom right |
| 44 |
705509 |
moderate olive brown |
2.0Y 3.7/6.4 |
0.2% |
11.4 |
in the centre |
| 45 |
796B58 |
grayish yellowish brown |
9.3YR 4.6/1.8 |
0.1% |
11.4 |
in the centre |
| 46 |
977E55 |
light olive brown |
1.8Y 5.2/3.7 |
0.1% |
10.9 |
on the right |
| 47 |
84453B |
moderate reddish brown |
8.1R 3.6/5.7 |
8.6% |
10.6 |
on the left |
| 48 |
9F7C60 |
light brown |
6.5YR 5.3/3.3 |
2.2% |
10.3 |
at the top right |
| 49 |
AC8F60 |
light yellowish brown |
9.6YR 5.9/4.2 |
0.2% |
10.1 |
at the bottom right |
| 50 |
BC685F |
moderate reddish orange |
8.3R 5.3/7.3 |
0.1% |
9.6 |
at the bottom left |
| 51 |
5D3608 |
strong brown |
7.3YR 2.6/5.4 |
0.1% |
9.6 |
at the top |
| 52 |
463822 |
grayish olive |
5.9Y 2.5/2.5 |
0.1% |
8.7 |
on the right |
| 53 |
9A6C15 |
strong yellowish brown |
0.2Y 4.8/8.0 |
0.3% |
8.2 |
in the centre |
| 54 |
5A2517 |
deep brown |
2.4YR 2.2/6.1 |
3.3% |
8.1 |
on the left |
| 55 |
9E8459 |
dark grayish yellow |
1.7Y 5.5/3.7 |
0.1% |
7.8 |
at the bottom right |
| 56 |
757467 |
light grayish olive |
0.6GY 4.7/1.3 |
4.8% |
7.4 |
at the bottom |
| 57 |
676959 |
grayish olive green |
6.4GY 4.4/1.5 |
0.2% |
7.2 |
at the bottom right |
| 58 |
886854 |
light brown |
6.7YR 4.7/3.3 |
0.5% |
6.9 |
at the bottom left |
| 59 |
7F6146 |
moderate yellowish brown |
0.7Y 4.3/3.3 |
0.1% |
5.7 |
at the top right |
| 60 |
AF7F71 |
light grayish red |
7.7R 5.5/4.2 |
0.1% |
5.2 |
in the centre |
| 61 |
755F4C |
grayish brown |
6.4YR 4.0/2.3 |
0.1% |
3.7 |
in the centre |
Colour name families
| Family |
Area |
| brown |
41% |
| olive brown |
10% |
| orange yellow |
9.4% |
| orange |
9.3% |
| olive |
8.0% |
| pink |
6.9% |
| gray |
4.8% |
| olive gray |
3.5% |
| red |
2.7% |
| yellow |
0.9% |
| green |
0.8% |
| black |
0.6% |
| yellow brown |
0.5% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.164 |
| Mean Local Roughness |
0.008 |
| Roughness Uniformity |
0.009 |
| Edge Density |
0.015 |
| Mean Gradient Magnitude |
0.089 |
| Gradient Variance |
0.015 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.011 |
| Pattern Complexity |
0.118 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.568 |
| Spatial Variation |
0.097 |
| Texture Consistency |
0.662 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.468 |
| Brightness Variance |
0.164 |
| Brightness Uniformity |
0.65 |
| Brightness Skewness |
-0.052 |
| Brightness Entropy |
7.319 |
| Rms Contrast |
0.164 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.618 |
| Mean Local Contrast |
0.01 |
| Contrast Uniformity |
0.006 |
| Dynamic Range |
0.882 |
| Effective Dynamic Range |
0.525 |
| Shadow Percentage |
20.968 |
| Midtone Percentage |
64.583 |
| Highlight Percentage |
14.449 |
| Shadow Clipping |
0.0 |
| Highlight Clipping |
0.0 |
| Tonal Balance |
0.114 |
| Fine Contrast |
0.004 |
| Medium Contrast |
0.012 |
| Coarse Contrast |
0.026 |
| Multiscale Contrast Ratio |
0.163 |
| Edge Contrast |
0.089 |
| Contrast Clustering |
0.338 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.683 |
| Color Clustering |
0.522 |
| Color Transition Smoothness |
0.756 |
| Transition Uniformity |
0.894 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.013 |
| Mean Saturation |
0.469 |
| Saturation Variance |
0.052 |
| Low Saturation Ratio |
0.268 |
| Medium Saturation Ratio |
0.532 |
| High Saturation Ratio |
0.2 |
| Saturation Clustering |
1.0 |
| Hue Concentration |
0.977 |
| Complementary Balance |
0.002 |
| Analogous Dominance |
0.996 |
| Temperature Bias |
0.995 |
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.
