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# 5.1.0

## 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.

## API additions

### Append to PDF files

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

### New BLP file format

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

## Other changes

### WebP memory leak

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