resize2

resize2 extends the standard zimg resizer with custom kernel support (user-defined kernels via a function), a blur parameter to widen filter taps, and force-resize flags for overriding zimg's no-op checks.

Differences from Core Resize

New Method

• Custom: Allows using a user-defined function as the scaling kernel.
  • custom_kernel: A callback function that takes an input position and returns an evaluated kernel value.
  • taps: The number of filter taps for the custom kernel.

New Parameters

Added to all resizing methods:

• blur / blur_uv: Multiplier for the filter frequency. Values > 1.0 blur the image, while values < 1.0 sharpen it. blur_uv specifically affects chroma planes.

  Equivalent to fh and fv parameters of fmtc: blur=1.5 == fh=1 / 1.5, fv=1 / 1.5

• force / force_uv: Boolean flag to force processing even when zimg would typically skip it. force_uv affects chroma.

• force_h / force_h_uv: Force horizontal processing specifically for luma or chroma.

• force_v / force_v_uv: Force vertical processing specifically for luma or chroma.

Installation

Pre-compiled wheels are available on PyPI for:

• Windows: x86_64
• Linux: x86_64 and aarch64
• macOS: arm64 (11.0+)

pip install vapoursynth-resize2

Compilation

uv build --wheel

On Windows you may want to add -Csetup-args="--vsenv" to the command.