DDColor: Optimized for Qualcomm Devices

DDColor is a coloring algorithm that produces natural, vivid color results from incoming black and white images.

This is based on the implementation of DDColor found here. This repository contains pre-exported model files optimized for Qualcomm® devices. You can use the Qualcomm® AI Hub Models library to export with custom configurations. More details on model performance across various devices, can be found here.

Qualcomm AI Hub Models uses Qualcomm AI Hub Workbench to compile, profile, and evaluate this model. Sign up to run these models on a hosted Qualcomm® device.

Getting Started

There are two ways to deploy this model on your device:

Option 1: Download Pre-Exported Models

Below are pre-exported model assets ready for deployment.

Runtime	Precision	Chipset	SDK Versions	Download
ONNX	float	Universal	QAIRT 2.45, ONNX Runtime 1.27.1	Download
QNN_DLC	float	Universal	QAIRT 2.45	Download
TFLITE	float	Universal	QAIRT 2.45	Download

For more device-specific assets and performance metrics, visit DDColor on Qualcomm® AI Hub.

Option 2: Export with Custom Configurations

Use the Qualcomm® AI Hub Models Python library to compile and export the model with your own:

• Custom weights (e.g., fine-tuned checkpoints)
• Custom input shapes
• Target device and runtime configurations

This option is ideal if you need to customize the model beyond the default configuration provided here.

See our repository for DDColor on GitHub for usage instructions.

Model Details

Model Type: Model_use_case.image_editing

Model Stats:

• Model checkpoint: ddcolor_paper_tiny.pth
• Input resolution: 224x224
• Number of parameters: 56.3M
• Model size (float): 215 MB
• Model size (w8a8): 54.8 MB

Performance Summary

Model	Runtime	Precision	Chipset	Inference Time (ms)	Peak Memory Range (MB)	Primary Compute Unit
DDColor	ONNX	float	Snapdragon® X2 Elite	28.048 ms	2 - 2 MB	NPU
DDColor	ONNX	float	Snapdragon® X Elite	72.597 ms	112 - 112 MB	NPU
DDColor	ONNX	float	Snapdragon® 8 Gen 3 Mobile	44.686 ms	2 - 1476 MB	NPU
DDColor	ONNX	float	Snapdragon® 8 Gen 1 Mobile	104.091 ms	3 - 538 MB	NPU
DDColor	ONNX	float	Qualcomm® Dragonwing™ QCS8550 (Proxy)	74.362 ms	0 - 540 MB	NPU
DDColor	ONNX	float	Qualcomm® QCS8450	104.091 ms	3 - 538 MB	NPU
DDColor	ONNX	float	Qualcomm® Dragonwing™ IQ-9075	80.439 ms	1 - 4 MB	NPU
DDColor	ONNX	float	Qualcomm® Dragonwing™ IQ-X7181	72.597 ms	112 - 112 MB	NPU
DDColor	ONNX	float	Qualcomm® Dragonwing™ Q-8750	35.203 ms	2 - 801 MB	NPU
DDColor	ONNX	float	Snapdragon® 8 Elite Mobile	35.203 ms	2 - 801 MB	NPU
DDColor	ONNX	float	Snapdragon® 8 Elite Gen 5 Mobile	27.458 ms	2 - 740 MB	NPU
DDColor	QNN_DLC	float	Snapdragon® X2 Elite	27.744 ms	1 - 1 MB	NPU
DDColor	QNN_DLC	float	Snapdragon® X Elite	62.37 ms	1 - 1 MB	NPU
DDColor	QNN_DLC	float	Snapdragon® 8 Gen 3 Mobile	41.678 ms	0 - 559 MB	NPU
DDColor	QNN_DLC	float	Snapdragon® 8 Gen 1 Mobile	73.513 ms	0 - 462 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® Dragonwing™ QCS8275	129.721 ms	1 - 453 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® Dragonwing™ QCS8550 (Proxy)	61.812 ms	1 - 456 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® SA8775P	65.654 ms	1 - 453 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® SA8650P	65.654 ms	1 - 453 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® SA8255P	65.654 ms	1 - 453 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® QCS8450	73.513 ms	0 - 462 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® Dragonwing™ IQ-9075	66.151 ms	1 - 4 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® Dragonwing™ IQ-X7181	62.37 ms	1 - 1 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® Dragonwing™ Q-8750	31.297 ms	1 - 620 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® SA7255P	129.721 ms	1 - 453 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® SA8295P	69.55 ms	0 - 330 MB	NPU
DDColor	QNN_DLC	float	Snapdragon® 8 Elite Mobile	31.297 ms	1 - 620 MB	NPU
DDColor	QNN_DLC	float	Snapdragon® 8 Elite Gen 5 Mobile	27.368 ms	0 - 642 MB	NPU
DDColor	TFLITE	float	Snapdragon® 8 Gen 3 Mobile	42.944 ms	1 - 1426 MB	NPU
DDColor	TFLITE	float	Snapdragon® 8 Gen 1 Mobile	81.11 ms	1 - 554 MB	NPU
DDColor	TFLITE	float	Qualcomm® Dragonwing™ QCS8275	124.433 ms	1 - 802 MB	NPU
DDColor	TFLITE	float	Qualcomm® Dragonwing™ QCS8550 (Proxy)	67.966 ms	1 - 4 MB	NPU
DDColor	TFLITE	float	Qualcomm® SA8775P	72.388 ms	1 - 851 MB	NPU
DDColor	TFLITE	float	Qualcomm® SA8650P	72.388 ms	1 - 851 MB	NPU
DDColor	TFLITE	float	Qualcomm® SA8255P	72.388 ms	1 - 851 MB	NPU
DDColor	TFLITE	float	Qualcomm® QCS8450	81.11 ms	1 - 554 MB	NPU
DDColor	TFLITE	float	Qualcomm® Dragonwing™ IQ-9075	72.594 ms	1 - 116 MB	NPU
DDColor	TFLITE	float	Qualcomm® Dragonwing™ Q-8750	33.701 ms	1 - 978 MB	NPU
DDColor	TFLITE	float	Qualcomm® SA7255P	124.433 ms	1 - 802 MB	NPU
DDColor	TFLITE	float	Qualcomm® SA8295P	73.625 ms	1 - 378 MB	NPU
DDColor	TFLITE	float	Snapdragon® 8 Elite Mobile	33.701 ms	1 - 978 MB	NPU
DDColor	TFLITE	float	Snapdragon® 8 Elite Gen 5 Mobile	27.498 ms	1 - 1042 MB	NPU

License

• The license for the original implementation of DDColor can be found here.

References

• DDColor: Towards Photo-Realistic Image Colorization via Dual Decoders
• Source Model Implementation

Community

• Join our AI Hub Slack community to collaborate, post questions and learn more about on-device AI.
• For questions or feedback please reach out to us.