Computational analysis of the photograph of the artwork C# minor - Reflexions 4 (AQC0439) [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 109 flat areas. The largest are yellowish gray (22%), yellowish gray (13%) and light olive brown (3.8%). Among the others, those that stand out most sharply from their surroundings are olive black at the top left (1.3%), dark grayish reddish brown on the left (1.7%) and dark olive brown on the left (0.2%). By colour name family: gray 44%, brown 7.8%, blue 6.6%, yellow green 6.5%, green 5.4%, olive brown 4.8%, olive 4.8%, yellow 3.8%, pink 3.6%, olive gray 3.1%, orange yellow 2.6%, white 2.3% and black 2.3%.
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: 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 (11).
| Rank |
Colour |
ISCC-NBS name |
Munsell |
Area |
Contrast |
Position |
| 1 |
22201C |
olive black |
0.6GY 1.4/0.9 |
1.3% |
51.3 |
at the top left |
| 2 |
372F2A |
dark grayish reddish brown |
8.3R 1.9/0.6 |
1.7% |
49.9 |
on the left |
| 3 |
312B26 |
dark olive brown |
1.0Y 1.8/1.1 |
0.2% |
45.7 |
on the left |
| 4 |
1E1D1A |
black |
N 1.0/ |
0.2% |
41.8 |
at the bottom |
| 5 |
4D3F3B |
dark reddish gray |
5.9R 2.7/1.2 |
0.3% |
40.8 |
at the top left |
| 6 |
362B23 |
dark olive brown |
1.0Y 1.8/1.1 |
0.6% |
40.8 |
in the centre |
| 7 |
854F3B |
moderate reddish brown |
0.8YR 3.8/5.2 |
0.3% |
40.4 |
on the right |
| 8 |
C5CBBE |
light greenish gray |
7.2GY 8.1/1.1 |
0.3% |
40.3 |
in the centre |
| 9 |
364D55 |
grayish blue |
4.8B 3.0/2.2 |
0.4% |
39.2 |
in the centre |
| 10 |
33322D |
dark grayish olive |
0.6GY 2.1/0.9 |
1.1% |
37.7 |
on the right |
| 11 |
724335 |
moderate reddish brown |
1.8YR 3.4/4.5 |
0.1% |
37.3 |
at the bottom |
| 12 |
BAB991 |
grayish yellow green |
0.8GY 7.5/2.7 |
2.3% |
37.3 |
at the top left |
| 13 |
C8CCC1 |
light gray |
1.0GY 8.1/0.5 |
0.1% |
32.6 |
on the left |
| 14 |
C39741 |
dark orange yellow |
0.4Y 6.3/7.4 |
0.1% |
31.9 |
at the top |
| 15 |
949C83 |
grayish yellow green |
5.5GY 6.2/1.8 |
0.8% |
31.7 |
at the top left |
| 16 |
A5B9C2 |
pale blue |
6.7B 7.4/2.3 |
1.0% |
31.4 |
on the left |
| 17 |
B7985B |
dark yellow |
3.8Y 6.4/5.2 |
0.2% |
31.2 |
at the top left |
| 18 |
282725 |
reddish black |
9.8R 1.5/0.6 |
0.6% |
29.6 |
at the top |
| 19 |
784735 |
moderate reddish brown |
1.0YR 3.5/5.2 |
0.1% |
27.8 |
at the bottom |
| 20 |
7C8185 |
greenish gray |
8.2BG 5.3/0.6 |
0.7% |
27.7 |
on the right |
| 21 |
4B5D4C |
grayish green |
0.1G 3.7/2.1 |
1.8% |
27.1 |
in the centre |
| 22 |
6A6664 |
dark reddish gray |
3.7R 4.2/0.6 |
0.7% |
25.9 |
on the right |
| 23 |
73573C |
moderate brown |
6.9YR 3.8/3.4 |
0.8% |
25.6 |
in the centre |
| 24 |
2F3539 |
dark grayish blue |
1.2PB 2.1/1.4 |
0.5% |
25.6 |
in the centre |
| 25 |
357A61 |
moderate green |
7.2G 4.6/5.2 |
0.8% |
25.4 |
at the bottom left |
| 26 |
767266 |
light grayish olive |
0.6GY 4.7/1.3 |
0.1% |
23.7 |
at the top |
| 27 |
CC9370 |
light brown |
3.6YR 6.5/5.4 |
0.3% |
23.5 |
at the top right |
| 28 |
88573D |
strong brown |
2.4YR 4.1/5.5 |
0.6% |
23.0 |
at the top right |
| 29 |
7E6F65 |
light brownish gray |
4.5YR 4.6/1.4 |
0.1% |
22.8 |
at the top left |
| 30 |
28322C |
dark grayish green |
9.4GY 2.0/1.5 |
0.1% |
22.2 |
in the centre |
| 31 |
925B30 |
strong brown |
5.1YR 4.4/6.2 |
0.1% |
22.0 |
at the top |
| 32 |
B2AEA9 |
pinkish gray |
2.3R 7.0/0.8 |
1.3% |
21.9 |
on the right |
| 33 |
4E6C89 |
moderate blue |
2.8PB 4.4/5.1 |
0.8% |
21.8 |
in the centre |
| 34 |
B2B9BD |
light greenish gray |
9.5BG 7.5/0.6 |
0.2% |
21.3 |
on the right |
| 35 |
D5CEC7 |
yellowish gray |
8.2YR 8.2/0.8 |
2.5% |
20.5 |
on the left |
| 36 |
50907A |
light green |
7.3G 5.5/4.8 |
0.2% |
20.3 |
in the centre |
| 37 |
9A6A4E |
light brown |
5.0YR 4.9/5.0 |
0.4% |
19.8 |
in the centre |
| 38 |
92A3BB |
pale blue |
4.9PB 6.6/3.9 |
0.6% |
19.2 |
on the right |
| 39 |
484842 |
olive gray |
0.5GY 3.2/0.7 |
0.5% |
18.9 |
at the top |
| 40 |
D4D28D |
pale greenish yellow |
0.9GY 8.3/4.8 |
0.1% |
18.7 |
in the centre |
| 41 |
DCC7AC |
brownish pink |
7.8YR 8.0/2.6 |
3.0% |
18.6 |
in the centre |
| 42 |
669D83 |
light green |
6.5G 5.9/4.2 |
0.3% |
18.5 |
on the left |
| 43 |
A2ACA1 |
light greenish gray |
0.6G 6.9/0.7 |
3.2% |
18.3 |
on the right |
| 44 |
6E4628 |
moderate brown |
5.0YR 3.2/4.3 |
0.8% |
17.5 |
at the top left |
| 45 |
897F47 |
light olive |
5.5Y 5.1/4.5 |
0.4% |
16.8 |
in the centre |
| 46 |
9D9A74 |
light grayish olive |
0.7GY 6.2/2.9 |
0.2% |
16.5 |
in the centre |
| 47 |
886A46 |
moderate yellowish brown |
9.8YR 4.7/4.2 |
0.7% |
16.3 |
at the top left |
| 48 |
D2C5B7 |
yellowish gray |
8.0YR 7.9/1.7 |
13% |
16.0 |
at the top |
| 49 |
99A274 |
moderate yellow green |
3.4GY 6.5/3.5 |
0.3% |
15.9 |
at the top right |
| 50 |
CD9D68 |
light yellowish brown |
7.6YR 6.7/5.5 |
0.1% |
15.8 |
in the centre |
| 51 |
AE7644 |
brownish orange |
6.3YR 5.3/6.4 |
0.1% |
15.7 |
at the top |
| 52 |
706148 |
moderate olive brown |
1.8Y 4.2/2.3 |
0.1% |
15.7 |
in the centre |
| 53 |
415446 |
dark grayish green |
10.0GY 3.3/2.2 |
0.1% |
15.5 |
at the bottom left |
| 54 |
C59766 |
light brown |
7.7YR 6.4/5.6 |
0.1% |
15.4 |
at the top |
| 55 |
D2A672 |
light yellowish brown |
7.6YR 7.0/5.5 |
0.1% |
15.4 |
in the centre |
| 56 |
B68938 |
dark yellow |
1.7Y 5.9/7.0 |
1.0% |
15.3 |
at the top right |
| 57 |
274056 |
dark greenish blue |
7.8B 2.7/3.2 |
0.1% |
15.3 |
at the top |
| 58 |
48667A |
grayish blue |
2.6PB 4.1/3.9 |
0.1% |
15.3 |
at the top |
| 59 |
BA8858 |
light brown |
7.7YR 6.1/5.7 |
0.1% |
15.1 |
at the top |
| 60 |
567391 |
moderate blue |
2.9PB 4.7/5.2 |
0.8% |
14.9 |
on the left |
| 61 |
CB9863 |
light yellowish brown |
8.5YR 6.7/6.0 |
0.1% |
14.3 |
in the centre |
| 62 |
E3B679 |
pale orange yellow |
8.4YR 7.6/5.8 |
1.7% |
14.2 |
at the top right |
| 63 |
5B3D27 |
moderate brown |
6.9YR 2.8/3.8 |
0.3% |
14.1 |
on the left |
| 64 |
8B8754 |
light olive |
7.7Y 5.4/3.7 |
0.1% |
14.0 |
on the right |
| 65 |
BA8350 |
moderate orange |
6.3YR 5.9/6.3 |
0.1% |
13.8 |
in the centre |
| 66 |
646052 |
grayish olive |
0.5GY 4.1/1.3 |
0.6% |
13.6 |
at the bottom |
| 67 |
657663 |
grayish green |
0.4G 4.6/1.9 |
0.1% |
13.2 |
in the centre |
| 68 |
C48E5B |
moderate orange |
6.2YR 6.2/6.3 |
0.1% |
13.0 |
in the centre |
| 69 |
879076 |
grayish yellow green |
6.8GY 5.8/2.7 |
0.2% |
13.0 |
on the left |
| 70 |
63674F |
grayish olive |
0.5GY 4.1/2.0 |
0.1% |
12.9 |
on the left |
| 71 |
B6B3AD |
yellowish gray |
0.8GY 7.2/0.5 |
22% |
12.6 |
at the bottom |
| 72 |
608372 |
moderate green |
5.4G 5.1/2.7 |
0.1% |
12.5 |
in the centre |
| 73 |
ADB586 |
moderate yellow green |
3.6GY 7.1/3.4 |
1.3% |
12.4 |
at the top right |
| 74 |
5D4129 |
dark yellowish brown |
9.1YR 3.0/3.2 |
0.1% |
12.3 |
on the left |
| 75 |
A1B5BE |
pale blue |
9.1B 7.2/2.0 |
0.6% |
12.2 |
on the right |
| 76 |
C2C3C4 |
light gray |
N 7.9/ |
1.1% |
12.2 |
at the bottom right |
| 77 |
9C9D9B |
medium gray |
N 6.3/ |
0.4% |
11.9 |
at the top |
| 78 |
7A6F5A |
grayish yellowish brown |
9.3YR 4.6/1.8 |
0.1% |
11.8 |
at the bottom |
| 79 |
5A7463 |
grayish green |
2.8G 4.6/2.3 |
0.6% |
11.6 |
at the bottom left |
| 80 |
657982 |
grayish blue |
5.7B 4.9/2.3 |
0.2% |
11.6 |
at the top |
| 81 |
6D6562 |
dark reddish gray |
3.7R 4.2/0.6 |
0.4% |
11.4 |
in the centre |
| 82 |
4B4A45 |
olive gray |
0.5GY 3.2/0.7 |
0.3% |
11.4 |
at the top |
| 83 |
737A7C |
greenish gray |
8.0BG 5.0/0.6 |
0.3% |
11.4 |
at the top |
| 84 |
AAA175 |
grayish greenish yellow |
7.5Y 6.6/3.5 |
0.1% |
11.2 |
in the centre |
| 85 |
9D8D72 |
light olive brown |
1.3Y 5.8/2.2 |
3.8% |
11.1 |
at the bottom |
| 86 |
7E9882 |
moderate yellowish green |
2.2G 6.0/2.9 |
0.2% |
10.4 |
at the bottom left |
| 87 |
8B9899 |
greenish gray |
8.9BG 6.2/1.2 |
0.9% |
10.3 |
at the top |
| 88 |
938855 |
light olive |
8.1Y 5.7/4.2 |
1.8% |
10.3 |
at the top right |
| 89 |
BECAD8 |
very pale blue |
3.0PB 8.1/2.9 |
0.2% |
10.1 |
on the right |
| 90 |
687A8E |
grayish blue |
2.4PB 5.0/2.8 |
0.4% |
9.3 |
on the right |
| 91 |
92A07F |
moderate yellow green |
6.1GY 6.4/3.1 |
1.1% |
8.9 |
on the right |
| 92 |
606234 |
moderate olive |
0.6GY 4.0/3.8 |
0.1% |
8.9 |
on the left |
| 93 |
8295A8 |
pale blue |
4.8PB 6.0/3.9 |
0.9% |
8.7 |
on the left |
| 94 |
9FAB8D |
grayish yellow green |
6.9GY 6.7/2.5 |
1.3% |
8.4 |
on the right |
| 95 |
A99F90 |
light brownish gray |
3.7YR 6.5/1.4 |
0.8% |
8.3 |
in the centre |
| 96 |
84888A |
greenish gray |
8.4BG 5.7/0.6 |
0.1% |
8.0 |
at the bottom right |
| 97 |
969388 |
light olive gray |
0.7GY 6.0/0.6 |
0.2% |
7.2 |
at the bottom |
| 98 |
978F81 |
light brownish gray |
9.4YR 5.8/0.8 |
2.8% |
7.1 |
at the bottom right |
| 99 |
748EAB |
light blue |
4.3PB 5.7/5.0 |
0.1% |
6.4 |
on the left |
| 100 |
959485 |
light olive gray |
0.7GY 6.0/1.1 |
0.4% |
5.9 |
at the bottom |
| 101 |
90897B |
light olive brown |
3.2Y 5.7/1.3 |
0.9% |
5.5 |
at the bottom |
| 102 |
8F918D |
greenish gray |
0.5G 5.9/0.8 |
0.1% |
5.5 |
at the bottom left |
| 103 |
A99988 |
light grayish yellowish brown |
8.7YR 6.4/1.7 |
0.5% |
5.3 |
at the top right |
| 104 |
696549 |
grayish olive |
5.5Y 4.2/2.0 |
0.1% |
5.0 |
on the left |
| 105 |
86876B |
light grayish olive |
0.7GY 5.3/1.8 |
0.3% |
5.0 |
on the left |
| 106 |
69633E |
moderate olive |
7.4Y 4.1/3.3 |
0.2% |
4.6 |
at the top |
| 107 |
64654C |
grayish olive |
0.5GY 4.1/2.0 |
0.1% |
4.2 |
on the left |
| 108 |
E3DBD0 |
yellowish white |
7.9YR 8.8/0.8 |
0.2% |
3.8 |
at the bottom left |
| 109 |
4A5B66 |
grayish blue |
7.6B 3.7/1.7 |
0.2% |
3.4 |
on the right |
Colour name families
| Family |
Area |
| gray |
44% |
| brown |
7.8% |
| blue |
6.6% |
| yellow green |
6.5% |
| green |
5.4% |
| olive brown |
4.8% |
| olive |
4.8% |
| yellow |
3.8% |
| pink |
3.6% |
| olive gray |
3.1% |
| orange yellow |
2.6% |
| white |
2.3% |
| black |
2.3% |
| olive black |
0.8% |
| olive green |
0.8% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.193 |
| Mean Local Roughness |
0.025 |
| Roughness Uniformity |
0.022 |
| Edge Density |
0.124 |
| Mean Gradient Magnitude |
0.199 |
| Gradient Variance |
0.063 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.008 |
| Pattern Complexity |
0.119 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.617 |
| Spatial Variation |
0.065 |
| Texture Consistency |
0.737 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.596 |
| Brightness Variance |
0.193 |
| Brightness Uniformity |
0.677 |
| Brightness Skewness |
-0.828 |
| Brightness Entropy |
7.445 |
| Rms Contrast |
0.193 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.627 |
| Mean Local Contrast |
0.026 |
| Contrast Uniformity |
0.114 |
| Dynamic Range |
1.0 |
| Effective Dynamic Range |
0.639 |
| Shadow Percentage |
11.963 |
| Midtone Percentage |
43.106 |
| Highlight Percentage |
44.93 |
| Shadow Clipping |
0.003 |
| Highlight Clipping |
0.002 |
| Tonal Balance |
0.133 |
| Fine Contrast |
0.014 |
| Medium Contrast |
0.033 |
| Coarse Contrast |
0.049 |
| Multiscale Contrast Ratio |
0.283 |
| Edge Contrast |
0.199 |
| Contrast Clustering |
0.263 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.681 |
| Color Clustering |
0.786 |
| Color Transition Smoothness |
0.489 |
| Transition Uniformity |
0.568 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.011 |
| Mean Saturation |
0.192 |
| Saturation Variance |
0.028 |
| Low Saturation Ratio |
0.799 |
| Medium Saturation Ratio |
0.192 |
| High Saturation Ratio |
0.009 |
| Saturation Clustering |
0.999 |
| Hue Concentration |
0.602 |
| Complementary Balance |
0.134 |
| Analogous Dominance |
0.76 |
| Temperature Bias |
0.428 |
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.
