| --- |
| license: cc-by-4.0 |
| pretty_name: Focus Stack Sample (999-frame macro stack) |
| tags: |
| - focus-stacking |
| - macro-photography |
| - photography |
| - image-alignment |
| - depth-of-field |
| - raw |
| - benchmark |
| size_categories: |
| - n<1K |
| task_categories: |
| - image-to-image |
| configs: |
| - config_name: default |
| data_files: |
| - split: train |
| path: tiff/*.tif |
| --- |
| |
| # Focus Stack Sample |
|
|
| A real-world macro focus stack of **999 frames**, shot on a Canon EOS R5 Mark II |
| with the RF 100mm F2.8 L Macro. It is meant as test data for focus-stacking |
| software: alignment, fusion, depth-map estimation and performance on long |
| stacks. |
|
|
|  |
|
|
| *All 999 frames stacked. Individual frames are shallow slices of this depth |
| range, as the samples below show.* |
|
|
| | Frame 0 | Frame 499 | Frame 998 | |
| | :---: | :---: | :---: | |
| |  |  |  | |
|
|
| ## Dataset structure |
|
|
| ``` |
| tiff/frame_000.tif … frame_998.tif 8-bit sRGB TIFF, deflate, 5118×3412 |
| raw/frame_000.CR3 … frame_998.CR3 Canon CR3 originals, 5088×3392 (1.6× crop mode) |
| preview/ JPEG previews (not part of the stack) |
| SHA256SUMS checksums for tiff/ and raw/ |
| ``` |
|
|
| Frames are numbered in shooting order, so the first *N* frames are always a |
| contiguous slice of the focus range. Four subset sizes are served by a single |
| glob each: |
|
|
| | Frames | TIFF pattern | TIFF size | CR3 size | |
| | ---: | --- | ---: | ---: | |
| | 10 | `tiff/frame_00?.tif` | 251 MB | 85 MB | |
| | 100 | `tiff/frame_0??.tif` | 2.5 GB | 845 MB | |
| | 500 | `tiff/frame_[0-4]??.tif` | 13 GB | 4.2 GB | |
| | 999 | `tiff/*` | 25 GB | 8.4 GB | |
|
|
| For CR3, swap `tiff/…tif` for `raw/…CR3`. |
|
|
| ## Download |
|
|
| ### CLI |
|
|
| ```bash |
| pip install -U huggingface_hub |
| |
| hf download jjjsood/focus-stack-sample --repo-type dataset --local-dir focus-stack --include "tiff/frame_00?.tif" # 10 |
| hf download jjjsood/focus-stack-sample --repo-type dataset --local-dir focus-stack --include "tiff/frame_0??.tif" # 100 |
| hf download jjjsood/focus-stack-sample --repo-type dataset --local-dir focus-stack --include "tiff/frame_[0-4]??.tif" # 500 |
| hf download jjjsood/focus-stack-sample --repo-type dataset --local-dir focus-stack --include "tiff/*" # 999 |
| ``` |
|
|
| ### Python |
|
|
| ```python |
| from huggingface_hub import snapshot_download |
| |
| path = snapshot_download( |
| "jjjsood/focus-stack-sample", |
| repo_type="dataset", |
| allow_patterns="tiff/frame_0??.tif", # first 100 frames |
| ) |
| ``` |
|
|
| ### Verify |
|
|
| ```bash |
| hf download jjjsood/focus-stack-sample SHA256SUMS --repo-type dataset --local-dir focus-stack |
| cd focus-stack && sha256sum -c SHA256SUMS --ignore-missing |
| ``` |
|
|
| ## Capture |
|
|
| | | | |
| | --- | --- | |
| | Camera | Canon EOS R5 Mark II | |
| | Lens | Canon RF 100mm F2.8 L Macro IS USM | |
| | Sensor mode | 1.6× crop (APS-C area), 17 MP, to save space; ~160 mm full-frame equivalent field of view | |
| | Focal length | 100 mm | |
| | Aperture | f/2.8 | |
| | Exposure | 0.3 s | |
| | ISO | 400 | |
| | Frames | 999, in about 6 minutes | |
| | Date | 2026-09-29 | |
|
|
| ## Processing |
|
|
| The CR3 files are unmodified camera originals. The TIFFs were developed from |
| them with darktable 5.6 using its default settings, identical for every frame, |
| and exported as 8-bit sRGB. No alignment, cropping or retouching was applied. |
| The script that produced them is in the |
| [GitHub repository](https://github.com/jjjsood/focus-stack-sample). |
|
|
| Use the CR3 files if you need full bit depth or your own raw development. |
|
|
| ## Uses |
|
|
| - Testing and benchmarking focus-stacking tools on a long, real stack. |
| - Evaluating frame alignment (focus breathing, small shifts between frames). |
| - Depth-from-focus and depth-map experiments. |
| - Stress-testing memory use and throughput: 999 × 17 MP frames. |
|
|
| ## License and citation |
|
|
| [CC BY 4.0](LICENSE). Please credit Johannes Sood. |
|
|
| ```bibtex |
| @misc{sood2026focusstacksample, |
| author = {Johannes Sood}, |
| title = {Focus Stack Sample: a 999-frame macro focus stack}, |
| year = {2026}, |
| howpublished = {\url{https://huggingface.co/datasets/jjjsood/focus-stack-sample}} |
| } |
| ``` |
|
|
