# Epsilon - Wavelet compressed images

Starting with GDAL 1.7.0, GDAL can read and write wavelet-compressed images through the Epsilon library. Starting with GDAL 1.9.0, epsilon 0.9.1 is required.

The driver rely on the Open Source EPSILON library (dual LGPL/GPL licence v3). In its current state, the driver will only be able to read images with regular internal tiling.

The EPSILON driver only supports 1 band (grayscale) and 3 bands (RGB) images

This is mainly intented to be used by the Rasterlite driver.

## Creation options

- TARGET Target size reduction as a percentage of the original (0-100). Defaults to 96

- FILTER. See EPSILON documentation or 'gdalinfo --format EPSILON' for full list of filter IDs. Defaults to 'daub97lift'

- BLOCKXSIZE=n: Sets tile width, defaults to 256. Power of 2 between 32 and 1024

- BLOCKYSIZE=n: Sets tile height, defaults to 256. Power of 2 between 32 and 1024

- MODE=[NORMAL/OTLPF] : OTLPF is some kind of hack to reduce boundary artefacts when image is broken into several tiles. Due to mathematical constrains this method can be applied to biorthogonal filters only. Defaults to OTLPF

- RGB_RESAMPLE=[YES/NO] : Whether RGB buffer must be resampled to 4:2:0. Defaults to YES

See Also:

- EPSILON home page