Computational analysis of the photograph of the artwork C# Major - Research on Harmony - Variation 3 (AQC0665) [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 43 flat areas. The largest are light gray (26%), pale blue (18%) and very pale green (11%). Among the others, those that stand out most sharply from their surroundings are dark grayish olive at the top (0.1%), dark grayish olive at the top (0.2%) and black in the centre (1.4%). By colour name family: green 38%, blue 23%, gray 17%, white 10.0%, yellow 4.2%, brown 2.4% and yellow green 1.9%.
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: 2281x3041 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 |
35322F |
dark grayish olive |
0.6GY 2.1/0.9 |
0.1% |
62.0 |
at the top |
| 2 |
3D3A35 |
dark grayish olive |
0.6GY 2.5/0.9 |
0.2% |
56.0 |
at the top |
| 3 |
353331 |
black |
N 2.1/ |
1.4% |
53.5 |
in the centre |
| 4 |
37332C |
dark grayish olive |
0.6GY 2.1/0.9 |
1.1% |
44.6 |
on the right |
| 5 |
B18B7F |
light reddish brown |
1.7YR 6.1/3.6 |
0.5% |
33.5 |
at the bottom left |
| 6 |
3B6452 |
moderate green |
6.5G 3.8/3.4 |
0.4% |
33.0 |
in the centre |
| 7 |
B9886D |
light brown |
4.8YR 6.1/4.9 |
1.5% |
24.4 |
in the centre |
| 8 |
ACBB9B |
grayish yellow green |
7.1GY 7.3/2.4 |
0.1% |
23.3 |
in the centre |
| 9 |
A8AB74 |
grayish greenish yellow |
0.8GY 6.8/4.0 |
0.5% |
20.8 |
at the top |
| 10 |
9BA665 |
moderate yellow green |
2.8GY 6.4/4.7 |
0.8% |
19.5 |
in the centre |
| 11 |
C09A7F |
moderate yellowish pink |
6.4YR 6.6/4.2 |
0.7% |
18.8 |
on the right |
| 12 |
C1C18D |
grayish greenish yellow |
0.8GY 7.7/3.8 |
0.1% |
17.8 |
at the top left |
| 13 |
CBC993 |
pale greenish yellow |
0.9GY 8.0/3.7 |
4.4% |
17.6 |
on the right |
| 14 |
2D7164 |
moderate bluish green |
0.3BG 4.3/4.9 |
7.4% |
17.5 |
at the bottom left |
| 15 |
B8BA8C |
grayish greenish yellow |
0.8GY 7.4/3.3 |
0.2% |
16.8 |
at the top |
| 16 |
76A79E |
light bluish green |
4.1BG 6.3/3.3 |
0.4% |
15.7 |
at the bottom |
| 17 |
C49E82 |
moderate yellowish pink |
4.2YR 6.6/3.8 |
0.3% |
15.3 |
on the right |
| 18 |
92BDB1 |
light bluish green |
4.1BG 7.2/2.7 |
0.3% |
13.8 |
at the bottom |
| 19 |
8D8377 |
light olive brown |
3.4Y 5.4/1.4 |
0.2% |
13.3 |
at the bottom left |
| 20 |
D2D3D2 |
light gray |
N 8.5/ |
26% |
13.2 |
at the top |
| 21 |
528090 |
moderate greenish blue |
6.0B 5.1/4.2 |
1.0% |
12.8 |
at the top left |
| 22 |
558495 |
moderate greenish blue |
6.0B 5.1/4.2 |
0.1% |
11.4 |
at the top left |
| 23 |
BAC7CB |
very pale blue |
2.9PB 7.8/1.6 |
0.1% |
11.1 |
in the centre |
| 24 |
5E848D |
moderate greenish blue |
3.0B 5.2/3.2 |
0.1% |
10.8 |
at the top |
| 25 |
598695 |
moderate greenish blue |
7.1B 5.2/3.8 |
0.1% |
9.9 |
at the top left |
| 26 |
A4C5B3 |
very pale green |
6.4G 7.6/2.3 |
11% |
9.8 |
at the bottom right |
| 27 |
618280 |
grayish green |
8.0BG 5.2/2.4 |
0.6% |
9.7 |
at the bottom right |
| 28 |
887F74 |
light brownish gray |
4.1YR 5.2/1.4 |
0.1% |
9.0 |
at the bottom |
| 29 |
8CAFB6 |
pale blue |
4.8B 6.7/2.7 |
18% |
8.9 |
on the left |
| 30 |
598692 |
moderate greenish blue |
7.1B 5.2/3.8 |
0.3% |
8.0 |
on the left |
| 31 |
559685 |
light bluish green |
0.9BG 5.6/4.5 |
0.1% |
7.7 |
at the bottom left |
| 32 |
5C8690 |
moderate greenish blue |
7.1B 5.2/3.8 |
0.1% |
7.7 |
on the left |
| 33 |
C2CCC4 |
light greenish gray |
0.9G 8.1/0.7 |
0.9% |
7.6 |
on the left |
| 34 |
668381 |
grayish green |
8.0BG 5.2/2.4 |
0.1% |
6.5 |
on the right |
| 35 |
5D8996 |
moderate greenish blue |
2.4B 5.4/3.6 |
0.1% |
6.5 |
at the top left |
| 36 |
8AA8A9 |
pale green |
9.0BG 6.7/2.3 |
11% |
6.5 |
on the right |
| 37 |
87A0A5 |
pale green |
8.8BG 6.4/2.3 |
0.1% |
6.4 |
in the centre |
| 38 |
807873 |
light brownish gray |
9.7YR 5.1/0.9 |
0.1% |
6.1 |
at the bottom left |
| 39 |
6D9F92 |
light bluish green |
4.0BG 6.0/3.3 |
5.5% |
5.5 |
at the bottom right |
| 40 |
749D94 |
light bluish green |
3.4BG 6.0/2.8 |
1.4% |
5.2 |
at the bottom |
| 41 |
ACBFA6 |
pale green |
8.4GY 7.4/1.9 |
0.2% |
4.9 |
on the right |
| 42 |
5C8C93 |
moderate greenish blue |
2.4B 5.4/3.6 |
0.3% |
4.8 |
at the top right |
| 43 |
9AAFB2 |
pale blue |
9.0B 6.8/1.9 |
0.1% |
4.7 |
in the centre |
Colour name families
| Family |
Area |
| green |
38% |
| blue |
23% |
| gray |
17% |
| white |
10.0% |
| yellow |
4.2% |
| brown |
2.4% |
| yellow green |
1.9% |
| pink |
0.8% |
| olive |
0.7% |
| black |
0.6% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.171 |
| Mean Local Roughness |
0.024 |
| Roughness Uniformity |
0.018 |
| Edge Density |
0.147 |
| Mean Gradient Magnitude |
0.201 |
| Gradient Variance |
0.046 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.008 |
| Pattern Complexity |
0.122 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.618 |
| Spatial Variation |
0.108 |
| Texture Consistency |
0.699 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.652 |
| Brightness Variance |
0.171 |
| Brightness Uniformity |
0.737 |
| Brightness Skewness |
-0.866 |
| Brightness Entropy |
7.283 |
| Rms Contrast |
0.171 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.521 |
| Mean Local Contrast |
0.026 |
| Contrast Uniformity |
0.297 |
| Dynamic Range |
1.0 |
| Effective Dynamic Range |
0.549 |
| Shadow Percentage |
5.734 |
| Midtone Percentage |
40.274 |
| Highlight Percentage |
53.992 |
| Shadow Clipping |
0.002 |
| Highlight Clipping |
0.0 |
| Tonal Balance |
0.04 |
| Fine Contrast |
0.013 |
| Medium Contrast |
0.032 |
| Coarse Contrast |
0.049 |
| Multiscale Contrast Ratio |
0.268 |
| Edge Contrast |
0.201 |
| Contrast Clustering |
0.301 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.696 |
| Color Clustering |
0.795 |
| Color Transition Smoothness |
0.499 |
| Transition Uniformity |
0.692 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.009 |
| Mean Saturation |
0.214 |
| Saturation Variance |
0.027 |
| Low Saturation Ratio |
0.743 |
| Medium Saturation Ratio |
0.248 |
| High Saturation Ratio |
0.009 |
| Saturation Clustering |
1.0 |
| Hue Concentration |
0.655 |
| Complementary Balance |
0.017 |
| Analogous Dominance |
0.792 |
| Temperature Bias |
-0.648 |
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.
