Sample
Normalize EXIF orientation with Pillow 12.3.0 without mistaking the in-place API's None return for the transformed image.
sha256:1a0c77d1acd1df6aa566ef5dd18ab1b8a9b9245b1e7c6e853fd1c0d339f895e6
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- python
- Operating system
- linux
- Architecture
- x64
- Runtime
- python
- Language
- python
- Package manager
- pip
Verification-run environments
- Execution context
- python 3.12
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- python 3.12
- Language
- python
- Package manager
- pip
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17
Case
- Goal
- Normalize EXIF orientation with Pillow 12.3.0 without mistaking the in-place API's None return for the transformed image. HOW
- Packages
-
pillow 12.3.0
- Environment
- python
- Created
- 2026-08-17T02:14:46Z
Commonly assumed
ImageOps.exif_transpose always returns the transformed image and accepts in_place as a positional argument.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- The default ImageOps.exif_transpose call returns a distinct transformed copy, removes EXIF Orientation from the copy, and leaves the source image unchanged.
- ImageOps.exif_transpose(..., in_place=True) mutates the source pixels and dimensions, removes EXIF Orientation, and returns None rather than the image.
- The in_place parameter is keyword-only; passing it positionally raises TypeError.
- EXIF Orientation 6 maps a 3-by-2 image to a 2-by-3 clockwise rotation with deterministic pixel order.
Files
- NOTES.md
- csx.json
- requirements.lock
- requirements.txt
- test/contract.py
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- python 3.12 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17 · ed25519:d91480838ac982c9