Contribution from Jérôme Bouat Replace pictures with grey level and indexed colours Change-Id: I5e253af65529d45b3c9ed2e30f6e2f018cbe03e7 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/160532 Tested-by: Jenkins Reviewed-by: Laurent Balland <laurent.balland@mailo.fr>