pixtreme 0.3.0

pixtreme: A High-Performance Graphics Library with CUDA Support

pixtreme

pixtreme is a high-performance image processing library for Python, leveraging CuPy and CUDA for GPU-accelerated computations, enabling real-time video processing with advanced features.

Features

• GPU-Accelerated Processing: Optimized with CuPy's CUDA RawKernel for extremely fast video analysis
• Comprehensive Color Space Support: BGR, RGB, HSV, YCbCr, YUV (4:2:0, 4:2:2), ACES color spaces
• Advanced Image Transforms: Affine transformation, resize with 11 interpolation methods
• Super Resolution: Multiple backend support (ONNX, PyTorch, TensorRT)
• 3D LUT Processing: Trilinear and tetrahedral interpolation with both CuPy and NumPy implementations
• Professional Color Management: ACES color space transformations for film/VFX workflows
• Flexible Data Type Support: Seamless conversion between uint8, uint16, float16, and float32
• DLPack Integration: Zero-copy tensor sharing between frameworks

Requirements

• Python >= 3.10

• CUDA Toolkit 12.x

• System dependencies:

  basicsr-fixed >= 1.4.2
  cupy-cuda12x >= 13.4.1
  numpy >= 2.2.6
  nvidia-nvimgcodec-cu12-stubs >= 0.5.0.13
  nvidia-nvimgcodec-cu12[all] >= 0.5.0.13
  onnx >= 1.18.0
  onnxconverter-common >= 1.13.0
  onnxruntime-gpu >= 1.22.0
  openexr >= 3.3.3
  spandrel >= 0.4.1
  spandrel_extra_arches >= 0.2.0
  tensorrt >= 10.11.0.33
  tensorrt_stubs >= 10.11.0.33
  torch >= 2.4
  torchvision >= 0.19
  

• Optional dependencies for OpenCV:

  opencv-python >= 4.11.0.86
  

• Optional dependencies for OpenCV Contrib:

  opencv-contrib-python >= 4.11.0.86
  

Installation

Standard Installation

pip install pixtreme[opencv]

OpenCV Contrib Installation

pip install pixtreme[opencv-contrib]

Development Installation

git clone https://github.com/minamikik/pixtreme.git
cd pixtreme

curl -LsSf https://astral.sh/uv/install.sh | sh
uv python pin 3.12  # supports 3.10 - 3.13
uv sync --extra dev --extra opencv

API Reference

pixtreme

• get_device_id() -> int - Get current CUDA device ID
• get_device_count() -> int - Get number of available CUDA devices
• Device - CUDA device context manager

pixtreme.color

• bgr_to_rgb(image: np.ndarray | cp.ndarray) -> np.ndarray | cp.ndarray - Convert BGR to RGB
• rgb_to_bgr(image: np.ndarray | cp.ndarray) -> np.ndarray | cp.ndarray - Convert RGB to BGR
• bgr_to_grayscale(image: cp.ndarray) -> cp.ndarray - Convert BGR to grayscale
• rgb_to_grayscale(image: cp.ndarray) -> cp.ndarray - Convert RGB to grayscale using Rec.709 coefficients
• bgr_to_hsv(image: cp.ndarray) -> cp.ndarray - Convert BGR to HSV
• hsv_to_bgr(image: cp.ndarray) -> cp.ndarray - Convert HSV to BGR
• rgb_to_hsv(image: cp.ndarray) -> cp.ndarray - Convert RGB to HSV
• hsv_to_rgb(image: cp.ndarray) -> cp.ndarray - Convert HSV to RGB
• bgr_to_ycbcr(image: cp.ndarray) -> cp.ndarray - Convert BGR to YCbCr (10-bit precision, Full Range)
• rgb_to_ycbcr(image: cp.ndarray) -> cp.ndarray - Convert RGB to YCbCr (10-bit precision, Full Range)
• ycbcr_to_bgr(image: cp.ndarray) -> cp.ndarray - Convert YCbCr to BGR (10-bit precision, Full Range)
• ycbcr_to_rgb(image: cp.ndarray) -> cp.ndarray - Convert YCbCr to RGB (10-bit precision, Full Range)
• ycbcr_full_to_legal(image: cp.ndarray) -> cp.ndarray - Convert Full Range YCbCr to Legal Range YCbCr
• ycbcr_legal_to_full(image: cp.ndarray) -> cp.ndarray - Convert Legal Range YCbCr to Full Range YCbCr
• ycbcr_to_grayscale(image: cp.ndarray) -> cp.ndarray - Extract Y channel as grayscale
• yuv420p_to_ycbcr444(yuv420_data: cp.ndarray, width: int, height: int, interpolation: int = 1) -> cp.ndarray - Convert YUV 4:2:0 planar to YCbCr 4:4:4
• yuv422p10le_to_ycbcr444(ycbcr422_data: cp.ndarray, width: int, height: int) -> cp.ndarray - Convert 10-bit YUV 4:2:2 to YCbCr 4:4:4
• uyvy422_to_ycbcr444(uyvy_data: cp.ndarray, height: int, width: int) -> cp.ndarray - Convert UYVY 4:2:2 packed format
• ndi_uyvy422_to_ycbcr444(uyvy_data: cp.ndarray) -> cp.ndarray - NDI-specific UYVY conversion
• aces2065_1_to_acescct(image: cp.ndarray) -> cp.ndarray - ACES2065-1 to ACEScct (log encoding)
• aces2065_1_to_acescg(image: cp.ndarray) -> cp.ndarray - ACES2065-1 to ACEScg (linear)
• aces2065_1_to_rec709(image: cp.ndarray) -> cp.ndarray - ACES2065-1 to Rec.709
• acescct_to_aces2065_1(image: cp.ndarray) -> cp.ndarray - ACEScct to ACES2065-1
• acescg_to_aces2065_1(image: cp.ndarray) -> cp.ndarray - ACEScg to ACES2065-1
• rec709_to_aces2065_1(image: cp.ndarray) -> cp.ndarray - Rec.709 to ACES2065-1
• read_lut(file_path: str, use_cache: bool = True, cache_dir: str = "cache") -> cp.ndarray - Read .cube format 3D LUT files
• apply_lut(frame_rgb: cp.ndarray, lut: cp.ndarray, interpolation: int = 0) -> cp.ndarray - Apply 3D LUT with interpolation
  • interpolation=0: Trilinear interpolation
  • interpolation=1: Tetrahedral interpolation

pixtreme.draw

• circle(image: cp.ndarray, center: tuple[int, int], radius: int, color: tuple[int, int, int], thickness: int = 1) -> cp.ndarray - Draw a circle on the image
• rectangle(image: cp.ndarray, top_left: tuple[int, int], bottom_right: tuple[int, int], color: tuple[int, int, int], thickness: int = 1) -> cp.ndarray - Draw a rectangle on the image
• add_label(image: cp.ndarray, text: str, position: tuple[int, int], color: tuple[int, int, int] = (255, 255, 255), font_scale: float = 1.0, thickness: int = 2) -> cp.ndarray - Add a label to the image
• put_text(image: cp.ndarray, text: str, position: tuple[int, int], color: tuple[int, int, int] = (255, 255, 255), font_scale: float = 1.0, thickness: int = 2) -> cp.ndarray - Put text on the image

pixtreme.filter

• GaussianBlur - Gaussian blur filter class
• gaussian_blur(image: cp.ndarray, kernel_size: int, sigma: float, kernel: cp.ndarray | None = None) -> cp.ndarray - Apply Gaussian blur

pixtreme.io

• imread(input_path: str, is_rgb: bool = False, is_nvimgcodec: bool = False) -> cp.ndarray - Read image file to GPU memory
• imwrite(output_path: str, image: cp.ndarray | np.ndarray, param: int = -1, is_rgb: bool = False) -> None - Write GPU image to file
• imshow(title: str, image: np.ndarray | cp.ndarray | nvimgcodec.Image, scale: float = 1.0, is_rgb: bool = False) -> None - Display GPU image
• waitkey(delay: int) -> int - Wait for keyboard input
• destroy_all_windows() -> None - Close all OpenCV windows

pixtreme.transform

• resize(src: cp.ndarray | list[cp.ndarray], dsize: tuple[int, int] | None = None, fx: float | None = None, fy: float | None = None, interpolation: int = INTER_AUTO) -> cp.ndarray | list[cp.ndarray]
  • Interpolation constants:
    • INTER_NEAREST (0) - Nearest neighbor
    • INTER_LINEAR (1) - Bilinear interpolation
    • INTER_CUBIC (2) - Bicubic interpolation
    • INTER_AREA (3) - Area-based resampling
    • INTER_LANCZOS4 (4) - Lanczos interpolation over 8x8 neighborhood
    • INTER_AUTO (5) - Auto-select based on image size
    • INTER_MITCHELL (6) - Mitchell-Netravali cubic filter
    • INTER_B_SPLINE (7) - B-spline interpolation
    • INTER_CATMULL_ROM (8) - Catmull-Rom spline
    • INTER_LANCZOS2 (9) - Lanczos over 4x4 neighborhood
    • INTER_LANCZOS3 (10) - Lanczos over 6x6 neighborhood
• affine_transform(src: cp.ndarray, M: cp.ndarray, dsize: tuple, flags: int = INTER_AUTO) -> cp.ndarray - Apply affine transformation
• get_inverse_matrix(M: cp.ndarray) -> cp.ndarray - Calculate inverse transformation matrix
• crop_from_kps(image: cp.ndarray, kps: cp.ndarray, size: int = 512) -> tuple[cp.ndarray, cp.ndarray] - Crop image based on keypoints
• erode(image: cp.ndarray, kernel_size: int, kernel: cp.ndarray | None = None, border_value: float = 0.0) -> cp.ndarray - Morphological erosion

pixtreme.upscale

• OnnxUpscaler - ONNX Runtime-based upscaling
  • Constructor: OnnxUpscaler(model_path: str | None = None, model_bytes: bytes | None = None, device_id: int = 0, provider_options: list | None = None)
• TorchUpscaler - PyTorch-based upscaling
  • Constructor: TorchUpscaler(model_path: str | None = None, model_bytes: bytes | None = None, device: str = "cuda")
• TrtUpscaler - TensorRT-optimized upscaling
  • Constructor: TrtUpscaler(model_path: str | None = None, model_bytes: bytes | None = None, device_id: int = 0)
• check_torch_model(model_path: str) -> bool - Check if a model is a valid PyTorch model
• check_onnx_model(model_path: str) -> bool - Check if a model is a valid ONNX model
• torch_to_onnx(model_path: str, onnx_path: str, input_shape: tuple = (1, 3, 1080, 1920), opset_version: int = 20, precision: str = "fp32", dynamic_axes: dict | None = None, device: str = "cuda") - Convert PyTorch models to ONNX
• onnx_to_trt_dynamic_shape(onnx_path: str, engine_path: str, precision: str = "fp16", workspace: int = 1024 << 20) - Convert ONNX models to TensorRT with dynamic shape support
• onnx_to_trt_fixed_shape(onnx_path: str, engine_path: str, precision: str = "fp16", workspace: int = 1024 << 20, input_shape: tuple = (1, 3, 1080, 1920)) - Convert ONNX models to TensorRT with fixed shape support
• onnx_to_trt(onnx_path: str, engine_path: str, precision: str = "fp16", workspace: int = 1024 << 20) - Convert ONNX models to TensorRT

pixtreme.utils

• to_uint8(image: np.ndarray | cp.ndarray) -> np.ndarray | cp.ndarray - Convert to 8-bit unsigned integer
• to_uint16(image: np.ndarray | cp.ndarray) -> np.ndarray | cp.ndarray - Convert to 16-bit unsigned integer
• to_float16(image: np.ndarray | cp.ndarray) -> np.ndarray | cp.ndarray - Convert to 16-bit float
• to_float32(image: np.ndarray | cp.ndarray) -> np.ndarray | cp.ndarray - Convert to 32-bit float
• to_float64(image: np.ndarray | cp.ndarray) -> np.ndarray | cp.ndarray - Convert to 64-bit float
• to_dtype(image: np.ndarray | cp.ndarray, dtype: str) -> np.ndarray | cp.ndarray - Convert to specified dtype
• guess_image_layout(image: np.ndarray | cp.ndarray) -> str - Infer image layout (e.g., "HW", "HWC", "CHW", "NHWC", "NCHW", "ambiguous", "unsupported")
• images_to_batch(images: cp.ndarray | list[cp.ndarray], size: int | tuple[int, int] | None = None, scalefactor: float | None = None, mean: float | tuple[float, float, float] | None = None, swap_rb: bool = True, layout: Layout = "HWC") -> cp.ndarray - Convert to batch format for neural networks
• image_to_batch(image: cp.ndarray, size: int | tuple[int, int] | None = None, scalefactor: float | None = None, mean: float | tuple[float, float, float] | None = None, swap_rb: bool = True, layout: Layout = "HWC") -> cp.ndarray - Convert single image to batch format
• image_to_batch_pixelshift(image: cp.ndarray, dim: int = 4, scalefactor: float | None = None, size: int | tuple[int, int] | None = None, swap_rb: bool = True, layout: Layout = "HWC") -> cp.ndarray - Convert image to batch format with pixel shift
• batch_to_images(batch: cp.ndarray, swap_rb: bool = True, layout: Layout = "NCHW") -> list[cp.ndarray] - Convert batch format back to images
• to_cupy(image: np.ndarray | torch.Tensor | nvimgcodec.Image) -> cp.ndarray - Convert various formats to CuPy array
• to_numpy(image: cp.ndarray | torch.Tensor | nvimgcodec.Image) -> np.ndarray - Convert to NumPy array
• to_tensor(image: np.ndarray | cp.ndarray | nvimgcodec.Image, device: str | torch.device | None = None) -> torch.Tensor - Convert to PyTorch tensor (requires PyTorch)

Usage Examples

Basic Image Processing

import cupy as cp
import pixtreme as px

# Read and convert image
frame_bgr = px.imread("image.jpg")
frame_bgr = px.to_float32(frame_bgr)
frame_rgb = px.bgr_to_rgb(frame_bgr)

# Color space conversions
frame_ycbcr = px.rgb_to_ycbcr(frame_rgb)
frame_hsv = px.rgb_to_hsv(frame_rgb)

# Advanced resize with Mitchell filter
frame_resized = px.resize(frame_rgb, (1920, 1080), interpolation=px.INTER_MITCHELL)

# Apply Gaussian blur
frame_blurred = px.gaussian_blur(frame_resized, 15, 5.0)

# Convert back and save
frame_bgr_out = px.rgb_to_bgr(frame_blurred)
frame_bgr_out = px.to_uint8(frame_bgr_out)
px.imwrite("output.jpg", frame_bgr_out)

Face Processing

import pixtreme as px

# Initialize face processing
detector = px.FaceDetection(model_path="models/detection.onnx")
embedder = px.FaceEmbedding(model_path="models/embedding.onnx")
swapper = px.FaceSwap(model_path="models/swap.onnx")

# Process faces
image = px.imread("portrait.jpg")
faces = detector.get(image)

for face in faces:
    embeddings = embedder.get(face)


    swapped = swapper.get(target_face, source_face)

Super Resolution

import pixtreme as px

# ONNX upscaling
upscaler = px.OnnxUpscaler(model_path="models/esrgan.onnx")
image_hr = upscaler.upscale(image_lr)

# TensorRT optimized upscaling
trt_upscaler = px.TrtUpscaler(model_path="models/esrgan.trt")
image_hr_fast = trt_upscaler.upscale(image_lr)

Professional Color Grading with ACES

import pixtreme as px

# Load image in Rec.709
image = px.imread("footage.png")
image = px.to_float32(image)

# Convert to ACES color space
image_aces = px.rec709_to_aces2065_1(image)

# Work in ACEScg (linear)
image_acescg = px.aces2065_1_to_acescg(image_aces)

# Apply color grading...

# Convert back to Rec.709
image_graded = px.acescg_to_aces2065_1(image_acescg)
image_final = px.aces2065_1_to_rec709(image_graded)

3D LUT Application

import pixtreme as px

# Load LUT
lut = px.read_lut("color_grade.cube")

# Apply with tetrahedral interpolation
image_graded = px.apply_lut(image_rgb, lut, interpolation=1)

Multi-GPU Processing

import pixtreme as px

# Process on specific GPU
with px.Device(1):
    image = px.imread("large_image.jpg")
    processed = px.resize(image, (4096, 2160))
    
# Get device info
device_count = px.get_device_count()
current_device = px.get_device_id()

Performance Notes

• All color conversion operations use optimized CUDA kernels
• Supports both legal range (16-235) and full range (0-255) for video processing
• 10-bit precision support for professional video workflows
• Zero-copy tensor sharing via DLPack for framework interoperability
• Batch processing support for multiple images

License

pixtreme is distributed under the MIT License (see LICENSE).

Included Components

• ACES LUTs
  • © 2014 Academy of Motion Picture Arts and Sciences
  • Licensed under "License Terms for ACES Components"
  • See third_party/aces/LICENSE_ACES.txt for details

Authors

minamik (@minamikik)

Acknowledgments

sync.dev