Conclusions
- Lighting specifications (golden hour diagonal, rim light, single window light, moody lighting) were reflected in all 5 patterns — light direction and color temperature were applied. The library golden hour diagonal light (A) in particular was stably confirmed in 3/3 images with warm-toned diagonal light
- The same library location produced clearly different atmospheres depending on lighting specification. Condition A’s golden hour diagonal created a warm, calm impression; Condition B’s rim light produced a dramatic effect with the subject outlined by light
- Rooftop scene (C): the combination of low angle + wind was effective. Wind-blown hair and a looking-up composition were reproduced in 3/3
- Gymnasium storage (D) was interpreted as a “locker room.” Despite specifying gymnastics mat and equipment storage, a locker room output appeared in most cases
- Hallway turning-back composition (E) was highly stable. A turning-back pose in a corridor with depth was achieved in 3/3
- For uncommon scenes like gymnasium storage, specific prop designation (gym mats, vaulting boxes) can correct the interpretation. The gymnasium storage interpreted as a locker room in Condition D was accurately reproduced in Condition F by specifying blue gym mats and vaulting boxes
What You’ll Learn
- Effects of lighting specification in school scenes
- Background reproduction accuracy for library, rooftop, gymnasium storage, and hallway
- Stability of low-angle and turning-back compositions
Experiment Conditions
| Parameter | Value |
|---|---|
| Model | z-image-turbo |
| Steps | 8 |
| CFG | 1.0 |
| Image Size | 1024x1024 |
| Seeds | 3 fixed seeds: 42, 123, 789 |
| Variable | Lighting × Location (control + 6 conditions) |
Subject common to all prompts: 1girl, 32yo japanese actress, school uniform
Control: Library × Indoor Lighting
| seed 42 | seed 123 | seed 789 |
|---|---|---|
 |  |  |
Observation: All 3 images reproduced a school library background. Standing in school uniform in the bookshelf aisle is a stable composition. Uniform fluorescent lighting falls evenly with no special lighting effects. Uniforms vary between blazer or vest + blouse + plaid pleated skirt. Bookshelf details were clearly depicted in 3/3.
Condition A: Library × Golden Hour Diagonal Light
| seed 42 | seed 123 | seed 789 |
|---|---|---|
 |  |  |
Observation: Diagonal evening light was confirmed in 3/3. The contrast with the control is clear — warm-toned light streams from windows, with rays visible on shelves and floor. Seed 42 shows the subject standing sideways in the bookshelf aisle with diagonal light from the right. Seed 123 also shows clear diagonal light beside the shelves. Seed 789 shows the subject standing in front of large windows in a near-backlit golden hour composition. Background bokeh from 85mm f/1.8 is visible. Dust particles are not clearly visible, but light ray expression worked in 3/3.
Condition B: Library × Rim Light
| seed 42 | seed 123 | seed 789 |
|---|---|---|
 |  |  |
Observation: The library bookshelf aisle was reproduced in 3/3. Unlike Condition A, the rim light specification produced edge lighting on the subject’s outline (hair and shoulders) in 3/3. Cinematic shadows are reflected as deep contrast between the shelves. Seed 42 shows a back view turning around, seed 123 also shows a back view looking at shelves. Seed 789 has rim light working effectively in warm golden hour light. The looking back pose specification was reflected in 2/3 as a turning composition.
Lab Director Comment: Same library, completely different vibe — that’s interesting. The rim light making the outline glow is just too dramatic. Love it.
Condition C: Rooftop × Golden Hour + Low Angle
| seed 42 | seed 123 | seed 789 |
|---|---|---|
 |  |  |
Observation: Rooftop background was reproduced in 3/3. The low-angle specification produced a looking-up composition in all 3, with the subject standing higher than the camera and lots of sky visible. Wind-blown hair was reflected in 3/3. Seed 42 shows the subject standing against a dramatic overcast sky and school building backdrop. Seed 123 has golden hour sky and school building. Seed 789 similarly shows the school building and sky from the rooftop perspective. The low angle + wide angle combination stably generates an impressive looking-up composition.
Condition D: Gymnasium Storage × Single Window Light
| seed 42 | seed 123 | seed 789 |
|---|---|---|
 |  |  |
Observation: “Gymnasium equipment storage room” was interpreted as a locker room in all 3 images — rows of metal lockers in the background in 3/3. However, the single window light specification worked effectively, with one-directional window light streaming diagonally in 3/3. Seed 42 in particular shows strong light reflecting off the metal locker surfaces with sharp contrast. The contrast specification produced deep shadows with a dramatic impression.
Condition E: Hallway × Turning Back + Moody Lighting
| seed 42 | seed 123 | seed 789 |
|---|---|---|
 |  |  |
Observation: A school hallway with depth was reproduced in 3/3. The turning back specification was stably reflected in all 3. Moody corridor lighting and dim lighting produced a dark tone with partial fluorescent illumination. Seed 42 shows a turning back pose in the center of a long corridor wearing a sailor collar uniform. Seed 123 shows a blazer uniform turning back with faint outside light from hallway windows. Seed 789 shows a sailor uniform turning back in a greenish-toned dim hallway. Film grain was confirmed as graininess in seed 789.
Condition F: Gymnasium Storage Specified (Improved Version of Condition D)
To address the “locker room” interpretation from Condition D, specific props were explicitly designated and retested.
| seed 42 | seed 123 | seed 789 |
|---|---|---|
 |  |  |
Observation: Seed 42 shows stacked blue gym mats in the background with a vaulting box also visible — accurately reproduced as gymnasium storage. The same scene that was interpreted as a locker room in Condition D is now correct thanks to the specific prop designation stacked blue gym mats and vaulting boxes. Single light source high-contrast lighting from the window also works similarly to Condition D. Specific prop designation was confirmed to correctly guide scene interpretation.
Lab Director Comment: Oh! Writing the specific props made it actually look like a gymnasium storage room. Guiding with props is more reliable than location names, apparently.
Comparison Summary
Lighting Specification Comparison
| Condition | Lighting Specification | Light Characteristics | Reproduction |
|---|---|---|---|
| ctrl | indoor lighting | Uniform fluorescent | 3/3 |
| A | sunset golden hour + diagonal light | Warm diagonal light, rays | 3/3 |
| B | rim light + cinematic shadows | Outline edge light, deep contrast | 3/3 |
| C | golden hour + low angle | Warm light + looking-up composition | 3/3 |
| D | single window light + contrast | One-directional window light, strong contrast | 3/3 |
| E | moody corridor lighting + dim | Dark tone, partial lighting | 3/3 |
| F | single window light + high contrast | One-directional window light, strong contrast | 3/3 |
Location Reproduction Accuracy
| Condition | Specified Location | Actual Output | Reproduction |
|---|---|---|---|
| ctrl | Library | Library with bookshelves | 3/3 |
| A | Library (after school) | Library bookshelf aisle | 3/3 |
| B | Library | Library bookshelf aisle | 3/3 |
| C | Rooftop | School rooftop + school building background | 3/3 |
| D | Gymnasium storage | Locker room | 0/3 (misinterpreted) |
| E | Hallway | School corridor with depth | 3/3 |
| F | Gymnasium storage (specific props) | Storage with gym mats + vaulting boxes | 3/3 |
Lab Director Comment: The biggest takeaway is that lighting specifications worked across all conditions. The same library producing completely different images with golden hour vs rim light is notable, and the gymnasium storage prop approach seems applicable to other scenes too. The hallway turning-back composition was highly stable and easy to use.
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