Enum ExrCompression

Namespace

SixLabors.ImageSharp.Formats.Exr.Constants

Assembly

SixLabors.ImageSharp.dll

Enumeration representing the compression formats defined by the EXR file-format.

public enum ExrCompression

Fields

B44 = 6

Channels of type HALF are split into blocks of four by four pixels or 32 bytes. Each block is then packed into 14 bytes, reducing the data to 44 percent of their uncompressed size. Compression is lossy.

B44A = 7

Like B44, except for blocks of four by four pixels where all pixels have the same value, which are packed into 3 instead of 14 bytes. For images with large uniform areas, B44A produces smaller files than B44 compression. Compression is lossy.

None = 0

Pixel data is not compressed.

Piz = 4

A wavelet transform is applied to the pixel data, and the result is Huffman-encoded. Compression is lossless.

Pxr24 = 5

After reducing 32-bit floating-point data to 24 bits by rounding, differences between horizontally adjacent pixels are compressed with zlib, similar to ZIP. PXR24 compression preserves image channels of type HALF and UINT exactly, but the relative error of FLOAT data increases to about 3×10-5. Compression is lossy.

RunLengthEncoded = 1

Differences between horizontally adjacent pixels are run-length encoded. This method is fast, and works well for images with large flat areas, but for photographic images, the compressed file size is usually between 60 and 75 percent of the uncompressed size. Compression is lossless.

Zip = 3

Differences between horizontally adjacent pixels are compressed using the open source zlib library. Unlike ZIPS compression, this operates in in blocks of 16 scan lines. Compression is lossless.

Zips = 2

Uses the open source zlib library for compression. Unlike ZIP compression, this operates one scan line at a time. Compression is lossless.