# Claim 1: Computational Image Analysis - AQC1147

**Artwork**: D7 - Research on Harmony - Variations 4  
**Artist**: Arnaud Quercy  
**Asset**: AQC1147

Computational analysis of the photograph of the artwork D7 - Research on Harmony - Variations 4 (AQC1147) [@catalogue] by Arnaud Quercy [@orcid], according to IDS-CMP-2025 [@cmp-standard], on an image 1000 pixels on its longer side, on 2026-10-07. 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 18 flat areas. The largest are moderate orange (36%), grayish blue (12%) and strong brown (11%). Among the others, those that stand out most sharply from their surroundings are grayish yellow at the bottom right (4.6%), blackish green in the centre (4.4%) and vivid reddish orange at the bottom (2.7%). By colour name family: orange 34%, brown 15%, blue 15%, yellow 7.5%, pink 7.3%, green 6.5%, black 4.3%, gray 4.0%, orange yellow 3.1% and yellow green 1.1%.

## Context

Analysis performed according to IDS-CMP-2025 [@cmp-standard]: (a) colours named by Munsell and ISCC-NBS, areas and flat areas, (b) texture, (c) brightness and contrast, (d) spatial distribution. Source image: 1150x1477 pixels. Analysis date: 2026-10-07.

### A) Color Analysis

#### Flat areas

*Ranked by contrast with their surroundings (CIEDE2000). Strokes thinner than 10 pixels are excluded (1).*

| Rank | Colour | ISCC-NBS name | Munsell | Area | Contrast | Position |
|---|---|---|---|---|---|---|
| 1 | <span style="display:inline-block;width:20px;height:20px;background-color:#B0A578;border:1px solid #999;vertical-align:middle;"></span> B0A578 | grayish yellow | 3.7Y 6.7/3.2 | 4.6% | 54.7 | at the bottom right |
| 2 | <span style="display:inline-block;width:20px;height:20px;background-color:#0F1F16;border:1px solid #999;vertical-align:middle;"></span> 0F1F16 | blackish green | 3.2G 0.8/1.9 | 4.4% | 45.2 | in the centre |
| 3 | <span style="display:inline-block;width:20px;height:20px;background-color:#FE6200;border:1px solid #999;vertical-align:middle;"></span> FE6200 | vivid reddish orange | 0.6YR 6.0/16.1 | 2.7% | 43.4 | at the bottom |
| 4 | <span style="display:inline-block;width:20px;height:20px;background-color:#5F5E61;border:1px solid #999;vertical-align:middle;"></span> 5F5E61 | dark bluish gray | 8.5PB 3.9/1.0 | 0.8% | 39.7 | at the top |
| 5 | <span style="display:inline-block;width:20px;height:20px;background-color:#BE8101;border:1px solid #999;vertical-align:middle;"></span> BE8101 | dark orange yellow | 0.5Y 5.8/9.9 | 0.8% | 36.2 | in the centre |
| 6 | <span style="display:inline-block;width:20px;height:20px;background-color:#417F27;border:1px solid #999;vertical-align:middle;"></span> 417F27 | strong yellow green | 7.8GY 4.6/8.1 | 3.0% | 35.4 | on the right |
| 7 | <span style="display:inline-block;width:20px;height:20px;background-color:#C1A486;border:1px solid #999;vertical-align:middle;"></span> C1A486 | light yellowish brown | 8.2YR 6.8/3.6 | 2.6% | 31.8 | in the centre |
| 8 | <span style="display:inline-block;width:20px;height:20px;background-color:#5D6573;border:1px solid #999;vertical-align:middle;"></span> 5D6573 | grayish blue | 5.0PB 4.1/2.3 | 12% | 31.1 | at the bottom |
| 9 | <span style="display:inline-block;width:20px;height:20px;background-color:#0E0A09;border:1px solid #999;vertical-align:middle;"></span> 0E0A09 | black | N 0.3/ | 4.7% | 30.7 | at the bottom right |
| 10 | <span style="display:inline-block;width:20px;height:20px;background-color:#B1381D;border:1px solid #999;vertical-align:middle;"></span> B1381D | deep reddish orange | 9.6R 4.2/11.9 | 1.3% | 29.8 | at the top left |
| 11 | <span style="display:inline-block;width:20px;height:20px;background-color:#953B01;border:1px solid #999;vertical-align:middle;"></span> 953B01 | strong brown | 2.4YR 3.6/9.8 | 11% | 29.5 | in the centre |
| 12 | <span style="display:inline-block;width:20px;height:20px;background-color:#F49B66;border:1px solid #999;vertical-align:middle;"></span> F49B66 | moderate orange | 3.4YR 7.1/9.1 | 36% | 26.9 | at the top |
| 13 | <span style="display:inline-block;width:20px;height:20px;background-color:#BDC601;border:1px solid #999;vertical-align:middle;"></span> BDC601 | strong greenish yellow | 1.8GY 7.5/10.7 | 1.2% | 25.3 | on the right |
| 14 | <span style="display:inline-block;width:20px;height:20px;background-color:#444D5D;border:1px solid #999;vertical-align:middle;"></span> 444D5D | grayish blue | 5.0PB 3.2/2.1 | 5.5% | 23.4 | at the bottom right |
| 15 | <span style="display:inline-block;width:20px;height:20px;background-color:#FCCAA8;border:1px solid #999;vertical-align:middle;"></span> FCCAA8 | light yellowish pink | 4.3YR 8.5/4.4 | 2.3% | 18.2 | at the top |
| 16 | <span style="display:inline-block;width:20px;height:20px;background-color:#C9BF85;border:1px solid #999;vertical-align:middle;"></span> C9BF85 | grayish yellow | 4.8Y 7.6/4.1 | 2.5% | 17.7 | at the top left |
| 17 | <span style="display:inline-block;width:20px;height:20px;background-color:#714C34;border:1px solid #999;vertical-align:middle;"></span> 714C34 | moderate brown | 5.0YR 3.6/4.1 | 3.6% | 17.6 | on the right |
| 18 | <span style="display:inline-block;width:20px;height:20px;background-color:#393B16;border:1px solid #999;vertical-align:middle;"></span> 393B16 | dark olive | 0.6GY 2.4/3.7 | 0.3% | 17.4 | in the centre |

#### Colour name families

| Family | Area |
|---|---|
| orange | 34% |
| brown | 15% |
| blue | 15% |
| yellow | 7.5% |
| pink | 7.3% |
| green | 6.5% |
| black | 4.3% |
| gray | 4.0% |
| orange yellow | 3.1% |
| yellow green | 1.1% |
| olive | 0.7% |
| olive black | 0.5% |

### B) Texture Analysis

| Metric | Value |
|--------|-------|
| Global Roughness | 0.216 |
| Mean Local Roughness | 0.012 |
| Roughness Uniformity | 0.017 |
| Edge Density | 0.019 |
| Mean Gradient Magnitude | 0.075 |
| Gradient Variance | 0.025 |
| Gradient Smoothness | 0.0 |
| Directional Coherence | 0.147 |
| Pattern Complexity | 0.126 |
| Pattern Repetition | 1.0 |
| Detail Frequency Ratio | 0.618 |
| Spatial Variation | 0.152 |
| Texture Consistency | 0.478 |

### C) Brightness & Contrast Analysis

| Metric | Value |
|--------|-------|
| Mean Brightness | 0.495 |
| Brightness Variance | 0.216 |
| Brightness Uniformity | 0.562 |
| Brightness Skewness | -0.408 |
| Brightness Entropy | 7.201 |
| Rms Contrast | 0.216 |
| Michelson Contrast | 1.0 |
| Weber Contrast | 0.691 |
| Mean Local Contrast | 0.011 |
| Contrast Uniformity | 0.0 |
| Dynamic Range | 0.976 |
| Effective Dynamic Range | 0.714 |
| Shadow Percentage | 26.434 |
| Midtone Percentage | 45.421 |
| Highlight Percentage | 28.145 |
| Shadow Clipping | 0.013 |
| Highlight Clipping | 0.0 |
| Tonal Balance | 0.0 |
| Fine Contrast | 0.007 |
| Medium Contrast | 0.014 |
| Coarse Contrast | None |
| Multiscale Contrast Ratio | 1.0 |
| Edge Contrast | 0.075 |
| Contrast Clustering | 0.522 |

### D) Spatial Distribution Analysis

| Metric | Value |
|--------|-------|
| Spatial Coherence | 0.747 |
| Color Clustering | 0.55 |
| Color Transition Smoothness | 0.794 |
| Transition Uniformity | 0.829 |
| Sharp Transition Ratio | 0.1 |
| Transition Directionality | 0.143 |
| Mean Saturation | 0.542 |
| Saturation Variance | 0.073 |
| Low Saturation Ratio | 0.223 |
| Medium Saturation Ratio | 0.477 |
| High Saturation Ratio | 0.3 |
| Saturation Clustering | 0.999 |
| Hue Concentration | 0.675 |
| Complementary Balance | 0.108 |
| Analogous Dominance | 0.806 |
| Temperature Bias | 0.633 |

## 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.