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 1.25.0	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	28.244 ms	2 - 2 MB	NPU
DDColor	ONNX	float	Snapdragon® X Elite	72.621 ms	113 - 113 MB	NPU
DDColor	ONNX	float	Snapdragon® 8 Gen 3 Mobile	44.913 ms	0 - 1474 MB	NPU
DDColor	ONNX	float	Snapdragon® 8 Gen 1 Mobile	102.53 ms	0 - 535 MB	NPU
DDColor	ONNX	float	Qualcomm® Dragonwing™ QCS8550 (Proxy)	73.153 ms	1 - 133 MB	NPU
DDColor	ONNX	float	Qualcomm® QCS8450	102.53 ms	0 - 535 MB	NPU
DDColor	ONNX	float	Qualcomm® Dragonwing™ IQ-9075	81.383 ms	1 - 5 MB	NPU
DDColor	ONNX	float	Snapdragon® 8 Elite Gen 5 Mobile	27.499 ms	2 - 739 MB	NPU
DDColor	ONNX	float	Snapdragon® 8 Elite Mobile	35.348 ms	2 - 800 MB	NPU
DDColor	ONNX	float	Qualcomm® Dragonwing™ Q-8750	35.348 ms	2 - 800 MB	NPU
DDColor	ONNX	float	Qualcomm® Dragonwing™ IQ-X7181	72.621 ms	113 - 113 MB	NPU
DDColor	QNN_DLC	float	Snapdragon® X2 Elite	27.841 ms	1 - 1 MB	NPU
DDColor	QNN_DLC	float	Snapdragon® X Elite	62.284 ms	1 - 1 MB	NPU
DDColor	QNN_DLC	float	Snapdragon® 8 Gen 3 Mobile	41.529 ms	0 - 559 MB	NPU
DDColor	QNN_DLC	float	Snapdragon® 8 Gen 1 Mobile	73.893 ms	0 - 463 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® QCS8275	129.665 ms	1 - 453 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® Dragonwing™ QCS8550 (Proxy)	61.869 ms	1 - 3 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® SA8775P	65.631 ms	1 - 453 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® SA8650P	65.631 ms	1 - 453 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® SA8255P	65.631 ms	1 - 453 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® QCS8450	73.893 ms	0 - 463 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® Dragonwing™ IQ-9075	66.492 ms	1 - 4 MB	NPU
DDColor	QNN_DLC	float	Snapdragon® 8 Elite Gen 5 Mobile	27.359 ms	0 - 631 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® SA7255P	129.665 ms	1 - 453 MB	NPU
DDColor	QNN_DLC	float	Snapdragon® 8 Elite Mobile	31.996 ms	1 - 620 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® SA8295P	69.54 ms	0 - 330 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® Dragonwing™ Q-8750	31.996 ms	1 - 620 MB	NPU
DDColor	QNN_DLC	float	Qualcomm® Dragonwing™ IQ-X7181	62.284 ms	1 - 1 MB	NPU
DDColor	TFLITE	float	Snapdragon® 8 Gen 3 Mobile	43.191 ms	1 - 1423 MB	NPU
DDColor	TFLITE	float	Snapdragon® 8 Gen 1 Mobile	80.702 ms	1 - 552 MB	NPU
DDColor	TFLITE	float	Qualcomm® QCS8275	124.76 ms	1 - 800 MB	NPU
DDColor	TFLITE	float	Qualcomm® Dragonwing™ QCS8550 (Proxy)	68.115 ms	1 - 4 MB	NPU
DDColor	TFLITE	float	Qualcomm® SA8775P	72.261 ms	1 - 854 MB	NPU
DDColor	TFLITE	float	Qualcomm® SA8650P	72.261 ms	1 - 854 MB	NPU
DDColor	TFLITE	float	Qualcomm® SA8255P	72.261 ms	1 - 854 MB	NPU
DDColor	TFLITE	float	Qualcomm® QCS8450	80.702 ms	1 - 552 MB	NPU
DDColor	TFLITE	float	Qualcomm® Dragonwing™ IQ-9075	72.291 ms	1 - 116 MB	NPU
DDColor	TFLITE	float	Snapdragon® 8 Elite Gen 5 Mobile	27.555 ms	1 - 1032 MB	NPU
DDColor	TFLITE	float	Qualcomm® SA7255P	124.76 ms	1 - 800 MB	NPU
DDColor	TFLITE	float	Snapdragon® 8 Elite Mobile	33.765 ms	1 - 982 MB	NPU
DDColor	TFLITE	float	Qualcomm® SA8295P	73.621 ms	1 - 378 MB	NPU
DDColor	TFLITE	float	Qualcomm® Dragonwing™ Q-8750	33.765 ms	1 - 982 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.