# 5.1.0

## New File Format

### BLP File Format

Pillow now supports reading the BLP “Blizzard Mipmap” file format used for tiles in Blizzard’s engine.

## API Changes

### Optional channels for TIFF files

Pillow can now open TIFF files with base modes of `RGB`, `YCbCr`, and `CMYK` with up to 6 8-bit channels, discarding any extra channels if the content is tagged as UNSPECIFIED. Pillow still does not store more than 4 8-bit channels of image data.

### Append to PDF Files

Images can now be appended to PDF files in place by passing in `append=True` when saving the image.

## Other Changes

### WebP memory leak

A memory leak when opening `WebP` files has been fixed.