release: publish version 0.5.0

This major release introduces computer vision features, advanced image
filtering, architectural improvements, and performance optimizations.
Python bindings gain matrix, PCA, and enhanced image API.

BREAKING CHANGE: Several API changes in core and Python bindings.
Refer to CHANGELOG.md and bindings/python/CHANGELOG.md for details.

Author: arrufat

CHANGELOG.md

@@ -1,5 +1,71 @@
 # Changelog
 
+## [0.5.0] - 2025-09-02
+
+### Major Features
+
+#### Computer Vision & Feature Detection
+- **ORB Feature Detection**: Complete ORB (Oriented FAST and Rotated BRIEF) implementation
+  - FAST corner detection with non-maximal suppression
+  - Binary descriptor extraction with rotation invariance
+  - Feature matching with Hamming distance
+  - KeyPoint structure with orientation and scale support
+- **Hungarian Algorithm**: Optimal assignment problem solver for feature matching
+- **Image Pyramid**: Multi-scale image representation for feature detection
+
+#### Advanced Image Filtering
+- **Convolution Framework**: Generic convolution with customizable kernels
+  - Gaussian blur with configurable sigma
+  - Difference of Gaussians (DoG) for edge detection
+  - Sobel edge detection with gradient magnitude
+- **Motion Blur Effects**: Linear and radial motion blur with SIMD optimization
+
+#### Image Processing Enhancements
+- **Advanced Blending**: 12 blend modes (normal, multiply, screen, overlay, soft light, etc.)
+- **Image Transforms**: Extraction, insertion, warping, and perspective transforms with interpolation
+- **Channel Operations**: Generic operations on individual color channels
+- **PSNR Calculation**: Peak Signal-to-Noise Ratio for quality assessment
+- **Border Handling**: Set borders, extract rectangles, and handle edge modes
+
+### Architecture Improvements
+- **Refactored Image Module**: Separated into logical sub-modules
+  - Core image operations in `image.zig`
+  - Filtering operations in `image/filtering.zig`
+  - Transform operations in `image/transforms.zig`
+  - Channel operations in `image/channel_ops.zig`
+- **Dynamic SVD**: Separated static and dynamic SVD implementations
+- **Enhanced PCA**: Runtime dimension support with batch operations
+- **Font System Overhaul**: Dynamic Unicode support with full 8x8 character set
+
+### Performance Optimizations
+- SIMD-optimized motion blur and convolution operations
+- Channel-separated processing for improved cache locality
+- Optimized integral image computation
+- Fast paths for axis-aligned image extraction
+- Vectorized filtering with boundary handling
+
+### API Changes
+- **Breaking**: Renamed enums for consistency
+  - `InterpolationMethod` → `Interpolation`
+  - `BlendMode` → `Blending`
+  - ANSI display modes renamed to SGR
+- **Breaking**: Rectangle bounds are now exclusive (was inclusive)
+- **Breaking**: Image constructors renamed for clarity
+  - `initBlank` → `init`
+  - `initFromSlice` → `fromSlice`
+- **Breaking**: `isView` renamed to `isContiguous`
+- Blur methods renamed: `boxBlur` → `blurBox`, added `blurGaussian`
+
+### JPEG Enhancements
+- Support for 4:4:4, 4:2:2, and 4:1:1 chroma subsampling
+- Improved component detection and color space handling
+
+### Bug Fixes
+- Fixed filter operations on non-contiguous image views
+- Corrected integral image boundary access
+- Fixed Sobel gradient magnitude scaling
+- Improved arc antialiasing in canvas drawing
+
 ## [0.4.1] - 2025-08-06
 
 ### Fixed

bindings/python/CHANGELOG.md

@@ -1,5 +1,86 @@
 # Python Bindings Changelog
 
+## [0.5.0] - TBD
+
+### Major Features
+
+#### Scientific Computing
+- **Matrix Class**: Full-featured matrix operations with NumPy interoperability
+  - Zero-copy NumPy conversion
+  - Runtime dimension support
+  - More matrix methods to come
+- **PCA (Principal Component Analysis)**: Complete PCA implementation
+  - Fit, transform, and inverse transform
+  - Batch operations support
+  - Configurable components and centering
+- **Optimization Module**: Hungarian algorithm for assignment problems
+
+#### Advanced Image Processing
+- **Motion Blur**: Linear and spin blur effects
+  - Configurable angle, distance, and strength
+  - SIMD-optimized performance
+- **Convolution & Filtering**:
+  - Gaussian blur with sigma control
+  - Sobel edge detection
+  - Sharpen filter
+- **Image Transforms**: Warp, rotate, and perspective transforms
+  - With multiple interpolation methods
+
+#### Enhanced Image API
+- **Image**: Generic storage (Rgba, Rgb, Grayscale)
+- **Pixel-Level Access**: Direct pixel component assignment
+  - `image[y, x].r = 255` syntax support
+  - Color conversion on pixel proxies
+  - Blend operations at pixel level
+- **NumPy Integration**: Improved strided image support
+  - Handles non-contiguous arrays
+  - Preserves memory layout
+- **Image Operations**:
+  - `copy()`, `dupe()`, `fill()` methods
+  - `view()`, `is_view` property
+  - `crop()`, `extract()`, `insert()` methods
+  - `flip_horizontal()`, `flip_vertical()`, `rotate()`
+  - `set_border()`, `get_rectangle()`
+  - PSNR calculation
+
+#### Drawing Enhancements
+- **Arc Drawing**: Circle arcs with fill support
+  - Start/end angles in degrees
+  - Antialiased rendering
+- **Advanced Blending**: 12 blend modes for compositing
+  - Per-pixel and whole-image blending
+  - Mode selection via Blending enum
+
+### API Improvements
+- **Type Annotations**: Modern Python type hints
+  - Uses `T | None` syntax
+  - Comprehensive stub files (.pyi)
+  - Better IDE autocomplete
+- **Iteration Support**: Images are now iterable
+  - Row-by-row iteration
+  - Pixel iterator access
+- **Comparison Operators**: Color types support equality comparison
+- **Rectangle Enhancements**:
+  - IoU (Intersection over Union) calculation
+  - Overlap detection
+  - Tuple support for intersection
+
+### Breaking Changes
+- **Canvas.draw_text**: Parameter order changed
+  - Old: `draw_text(x, y, text, font, color)`
+  - New: `draw_text(x, y, text, color, font)`
+
+### Bug Fixes
+- Fixed RGBA object detection in Image color initialization
+- Corrected alpha blending in Canvas.fill_rectangle SOFT mode
+- Improved error messages with file paths
+- Fixed None handling in Image.set_border
+
+### Performance
+- SIMD-optimized filtering operations
+- Efficient memory management for views
+- Zero-copy operations where possible
+
 ## [0.4.1] - 2025-08-06
 
 ### Fixed

bindings/python/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "zignal-processing"
-version = "0.5.0.dev110"
+version = "0.5.0"
 description = "Zero-dependency image processing library"
 readme = "README.md"
 authors = [{name = "zignal contributors"}]

build.zig.zon

@@ -1,8 +1,8 @@
 .{
     .name = .zignal,
-    .version = "0.5.0-dev",
+    .version = "0.5.0",
     .fingerprint = 0x5303c43db377b63a,
-    .minimum_zig_version = "0.15.0-dev.1519+dd4e25cf4",
+    .minimum_zig_version = "0.15.1",
     .dependencies = .{},
     .paths = .{
         "build.zig",

examples/build.zig.zon

@@ -2,7 +2,7 @@
     .name = .zignal_examples,
     .version = "0.0.0",
     .fingerprint = 0xcf70e6a9b7002db6,
-    .minimum_zig_version = "0.15.0-dev.1519+dd4e25cf4",
+    .minimum_zig_version = "0.15.1",
     .dependencies = .{
         .zignal = .{
             .path = "../",
@@ -12,6 +12,6 @@
         "build.zig",
         "build.zig.zon",
         "src",
-        "lib",
+        "web",
     },
 }