FabricJS Image.applyFilters trims image

Issue

When you apply filters to an image, it trims on the right or bottom part.

Cause

Internally by default image is painted over a tile of 2048×2048. If the height or width of the image is greater than 2048, remaining part of the image will be trimmed.

Fix

Increase textureSize to 4096 at the beginning of the code.

fabric.textureSize = 4096;

This means that fabric will now handle 4096×4096 image which is more than enough to handle a scanned legal/A4 paper with 300 dpi resolution.
More technical details can be found at http://fabricjs.com/fabric-filters