Here are the supported values:

Lossless: With lossless compression of images, all pixels are preserved.

JPEG: With JPEG compression of images and a high-quality level, almost all pixels are preserved. With a low-quality level, some pixels get lost and artifacts are introduced, but file sizes are reduced.

The filetype-settings\settings\OpenOffice\images\compressionValue element specifies the level of compression for JPEG images.

file2pdfconfig Schema