arraypress/colorize-ddcolor-tiny

DDColor Tiny — Core ML (for img colorize)

Automatic colorization of black-and-white photographs, on-device. This is the model behind img colorize in swift-img-cli, through the public swift-image-colorizer library, which downloads it on first use.

• Model: DDColor (Kang et al., DDColor: Towards Photo-Realistic Image Colorization via Dual Decoders, ICCV 2023, arXiv:2212.11613) — piddnad/DDColor, Apache-2.0, the paper_tiny (ConvNeXt-T) checkpoint.
• Conversion: coremltools, by mlboydaisuke/DDColor-Tiny-CoreML (Apache-2.0), commit 48c9a506b578460681078e31378e2eaae424a044. These files are that package byte for byte, re-hosted so the tools pin one commit they were measured against.
• Licence: Apache-2.0 — see LICENSE (DDColor's own).

Interface

Field	Value
Input image	float32 [1, 3, 512, 512], RGB 0…1 — the photo's CIELAB L with a = b = 0, back in sRGB
Output ab_channels	[1, 2, 512, 512], CIELAB a and b
Compute units	all

The library keeps the photograph's own luminance at full resolution and takes only the predicted a/b, upsampled — so no edge, face or detail moves; only colour is added.