v0.31.0 - 5th September 2022

Drop support for Node.js 12, now requires Node.js >= 14.15.0.

GIF output now re-uses input palette if possible. Use reoptimise option to generate a new palette.

Add WebP minSize and mixed options for greater control over animation frames.

Remove previously-deprecated WebP reductionEffort and HEIF speed options. Use effort to control these.

The flip and flop operations will now occur before the rotate operation.

Improve normalise operation with use of histogram. #200

Use combined bounding box of alpha and non-alpha channels for trim operation. #2166

Add Buffer and Stream support to tile-based output. #2238

Add input fileSuffix and output alias to format information. #2642

Re-introduce support for greyscale ICC profiles (temporarily removed in 0.30.2). #3114

Add support for WebP and PackBits compression options with TIFF output. #3198

Ensure OpenSlide and FITS input works with custom libvips. #3226

Ensure trim operation is a no-op when it would reduce an image to nothing. #3223

Expose vips_text to create an image containing rendered text. #3252 @brahima

Ensure only properties owned by the withMetadata EXIF Object are parsed. #3292

Expand linear operation to allow use of per-channel arrays. #3303 @antonmarsden

Ensure the order of rotate, resize and extend operations is respected where possible. Emit warnings when previous calls in the same pipeline will be ignored. #3319

Ensure PNG bitdepth can be set for non-palette output. #3322

Add trim option to provide a specific background colour. #3332 @mart-jansink

Ensure resized image is unpremultiplied before composite. #3334