# Lossless Image Compression on ImageNet 32x32

Source: [Lossless Image Compression on ImageNet 32x32](<https://www.sota2.com/research/sota/lossless-image-compression-on-imagenet-32x32>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2026-02-26T05:37:25.529Z

Evaluation of lossless image compression models using metrics like bpsp (bits per spatial position) on the ImageNet dataset downsampled to 32x32 resolution.

A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage.

| Scope | Recorded value |
| --- | --- |
| Task | Lossless Image Compression |
| Dataset (including any stated split) | ImageNet 32x32 |
| Metric | BPSP |
| Unit | SCALAR |
| Direction | Lower is better |
| Results loaded | 7 of 7 |
| Coverage | All results currently returned for this benchmark |

Evaluation settings may differ between results. The original papers and recorded configurations are needed to establish comparability. A shared metric name alone does not establish an identical protocol.

## Metrics

- [BPSP](<https://www.sota2.com/research/sota/lossless-image-compression-on-imagenet-32x32.md?metric=BPSP>): Lower is better; unit: SCALAR.

## Recorded results

| Method | BPSP | Result date | Report paper |
| --- | --- | --- | --- |
| PixelCNN | 3.83 | Not recorded | 68fa67201e209131cea14715 |
| MS-PixelCNN | 3.95 | Not recorded | 68fa67201e209131cea14715 |
| L3C | 4.76 | Not recorded | 68fa67201e209131cea14715 |
| FLIF | 5.08 | Not recorded | 68fa67201e209131cea14715 |
| WebP | 5.28 | Not recorded | 68fa67201e209131cea14715 |
| JPEG 2000 | 6.35 | Not recorded | 68fa67201e209131cea14715 |
| PNG | 6.42 | Not recorded | 68fa67201e209131cea14715 |

### PixelCNN

BPSP: 3.83. Result ID: 698d19b78b517eb4331f07b1.

[Reporting paper](<https://www.sota2.com/research/paper/68fa67201e209131cea14715.md>)

[Method origin paper](<https://www.sota2.com/research/paper/68fa62b81e209131ce9fad7e.md>)

Recorded evaluation configuration: {"Learned":true}. This record does not assert independent reproduction.

### MS-PixelCNN

BPSP: 3.95. Result ID: 698d19b78b517eb4331f07b2.

[Reporting paper](<https://www.sota2.com/research/paper/68fa67201e209131cea14715.md>)

[Method origin paper](<https://www.sota2.com/research/paper/68fa632f1e209131ce9fd244.md>)

Recorded evaluation configuration: {"Learned":true}. This record does not assert independent reproduction.

### L3C

BPSP: 4.76. Result ID: 698d19b78b517eb4331f07b0.

[Reporting paper](<https://www.sota2.com/research/paper/68fa67201e209131cea14715.md>)

[Method origin paper](<https://www.sota2.com/research/paper/68fa67201e209131cea14715.md>)

[Implementation](<https://www.sota2.com/github.com/fab-jul/L3C-PyTorch>)

Recorded evaluation configuration: {"Learned":true}. This record does not assert independent reproduction.

### FLIF

BPSP: 5.08. Result ID: 698d19b78b517eb4331f07b6.

[Reporting paper](<https://www.sota2.com/research/paper/68fa67201e209131cea14715.md>)

Recorded evaluation configuration: {"Learned":false}. This record does not assert independent reproduction.

### WebP

BPSP: 5.28. Result ID: 698d19b78b517eb4331f07b5.

[Reporting paper](<https://www.sota2.com/research/paper/68fa67201e209131cea14715.md>)

Recorded evaluation configuration: {"Learned":false}. This record does not assert independent reproduction.

### JPEG 2000

BPSP: 6.35. Result ID: 698d19b78b517eb4331f07b4.

[Reporting paper](<https://www.sota2.com/research/paper/68fa67201e209131cea14715.md>)

Recorded evaluation configuration: {"Learned":false}. This record does not assert independent reproduction.

### PNG

BPSP: 6.42. Result ID: 698d19b78b517eb4331f07b3.

[Reporting paper](<https://www.sota2.com/research/paper/68fa67201e209131cea14715.md>)

Recorded evaluation configuration: {"Learned":false}. This record does not assert independent reproduction.

Page 1 of 1. This is an index page, not the full collection.