---
license: other
language:
  - en
tags:
  - art
  - painting
  - hammershoi
  - lora-training
  - ideogram-4
task_categories:
  - text-to-image
size_categories:
  - n<1K
configs:
  - config_name: default
    data_files:
      - split: train
        path:
          - train/*.png
          - train/metadata.jsonl
  - config_name: boxes
    data_files:
      - split: train
        path:
          - boxes/*.jpg
          - boxes/metadata.jsonl
---

# Hammershøi Ideogram 4 Dataset

288 crops of paintings by Vilhelm Hammershøi (1864–1916), captioned for training an
[Ideogram 4](https://huggingface.co/ideogram-ai/ideogram-4-fp8) LoRA.

Same images as [Hammershoi-Training-Dataset](https://huggingface.co/datasets/jejunepixels/Hammershoi-Training-Dataset)
minus one rejected crop, with new captions in Ideogram 4's structured JSON format.

## Files

`train/` holds `<name>.png`, `<name>.txt` (the JSON caption, for AI-Toolkit and similar trainers) and
`metadata.jsonl` (the same caption plus source and size, for the dataset viewer).

`boxes/` holds copies of the images with their bounding boxes drawn on. Don't train on these.

## See the bounding boxes

Open the [**boxes** subset in the viewer](https://huggingface.co/datasets/jejunepixels/Hammershoi-Ideogram4-Dataset/viewer/boxes) to see every image with its boxes drawn on.
Each box has a numbered tag, and the `boxes` column says what each number is. The `without_box` column lists elements
that have a description and no box.

<p>
<img src="https://huggingface.co/datasets/jejunepixels/Hammershoi-Ideogram4-Dataset/resolve/main/boxes/portrait121.jpg" width="32%" alt="A woman at a window, with numbered bounding boxes on the figure, window and bed">
<img src="https://huggingface.co/datasets/jejunepixels/Hammershoi-Ideogram4-Dataset/resolve/main/boxes/interior026.jpg" width="32%" alt="A bust, a chest of drawers and a chair, each with a numbered bounding box">
<img src="https://huggingface.co/datasets/jejunepixels/Hammershoi-Ideogram4-Dataset/resolve/main/boxes/interior002.jpg" width="32%" alt="A room with a stove, a door and a wooden floor, each with a numbered bounding box">
</p>

## Captions

Compact JSON following the [Ideogram 4 caption schema](https://github.com/ideogram-oss/ideogram4/blob/main/docs/prompting.md).
`high_level_description` starts with the trigger `hmrsh painting: `. Bounding boxes are
`[y_min, x_min, y_max, x_max]` on a 0–1000 scale.

Captions and boxes were drafted by Claude from the images and earlier captions, then reviewed and corrected by hand.
Boxes are close estimates, not pixel-exact. Some elements have a description and no box, where the reviewer removed the box.
Colour palettes are extracted from the pixels.

## Sizes

| Size | Images |
|---|---|
| 896×1152 | 91 |
| 1024×1024 | 77 |
| 768×1344 | 56 |
| 1152×896 | 32 |
| 1344×768 | 30 |
| 996×1152 | 2 |

## Sources

Each row of `metadata.jsonl` names its source. They include museum collections and auction-house images.
The paintings are in the public domain; check the source of a reproduction before reusing it.