Ido Chawan
This case compares two front-view images of the same Ido Chawan object. The comparison examines how lighting direction and shadow formation affect the visibility of asymmetrical form, depth, surface roughness, and ceramic materiality.
Control Condition
Bilateral direct softbox lighting was used as the baseline condition. This image provides a bright and evenly illuminated record, but reduced shadow and weak tonal contrast flatten the irregular rim, curved walls, depth, and surface texture.
Variable Condition
The lighting condition was adjusted using left-side single directional light and a black reflector. This condition forms stronger tonal differences and uses shadow to make the irregular form, depth, and rough surface more visible.
Ido Chawan: Control Condition Front View
Ido Chawan: Variable Condition Front View
1. Quantitative Paradata: Technical Requirement
This table compares the technical and physical conditions under which the two images were produced.
| Category | Control Condition | Variable Condition |
|---|---|---|
| Image role | Control condition image | Variable condition image |
| View type | Front view | Front view |
| Lighting type | Bilateral softbox lighting | Single directional light |
| Light distance | Approximately 1 m from the object | Approximately 50 cm from the object |
| Incident method | Direct light from left and right softboxes | Changed from bilateral symmetrical direct light to single left-side directional light |
| Auxiliary device | Not used | Black reflector positioned at the upper right |
| Camera setting | Not recorded | ISO 400 / f/22 / 1/125s / 50mm |
| File generation | RAW-derived cropped JPEG image | RAW-derived cropped JPEG image |
| Colour profile | sRGB | sRGB |
2. Qualitative Paradata: Reproduction Note
This table compares the interpretive and observational notes recorded for each image.
| Category | Control Condition | Variable Condition |
|---|---|---|
|
Photographic intention |
This image was produced as a baseline using bilateral direct softbox lighting to record the overall outline and surface under even illumination. | This image was produced to reveal the irregular form and three-dimensional structure of the Ido Chawan by using shadow as a visual cue for depth, curvature, and asymmetry. |
| Problem recognition | Symmetrical lighting reduced tonal contrast and minimised shadow formation. The irregular rim, inner and outer curves, wall curvature, and rough surface therefore appeared relatively flat. | The control condition showed that even illumination weakened form perception and surface definition by suppressing the shadows needed to articulate depth and direction. |
| Adjustment process | No corrective adjustment was applied. The bilateral softbox arrangement and approximately 1 m lighting distance were retained as the control condition. | The bilateral arrangement was replaced with left-side single directional light at approximately 50 cm. A black reflector was positioned at the upper right, and ISO was increased to 400 to compensate for the altered exposure condition. |
| Visual observation | The overall form is visible, but the irregular rim and asymmetrical profile are weakly articulated. The curves show limited depth, while surface roughness and fine grain appear visually flattened. | Stronger tonal differences appear along the inner and outer curves. The irregular rim, asymmetrical profile, rough surface, and fine grain are more clearly perceived through directional light and shadow. |
| Interpretive significance | The image demonstrates that bright and even illumination can conceal form-related and material information. | The comparison demonstrates that shadow can function as necessary visual information when form is the primary object of interpretation. |
Interpretation
The comparison demonstrates that the difference between the two images is not merely a matter of brightness or aesthetic preference. In the control condition image, bilateral symmetrical softbox lighting minimises shadow and weakens tonal contrast. As a result, the irregular rim, inner and outer curves, asymmetrical profile, and rough surface appear relatively flat.
In the variable condition image, left-side single directional light and the upper-right black reflector create stronger tonal differences and use shadow to articulate depth, curvature, and surface texture. The visible difference results from a change in the conditions of image production rather than a change in the ceramic object itself. Recording these conditions as paradata allows viewers to understand shadow as an interpretive visual resource rather than as a defect that must always be removed.
Full Media Records
The full media records provide the complete metadata and paradata for each image.
Explore Object Details
The annotated image identifies material and formal features examined through enlarged comparative views. Select the corresponding numbered detail below to open its comparison page.
Detail 1 examines the fine surface network, granular texture, and small dark inclusions.