The color mode "Watermark" makes images pale, not transparent

In section 20.104 draw:color-mode ODF1.2 specifies "watermark: colors are modified to make the resulting image transparent." That is wrong, the image becomes pale, not transparent.
The property is only implemented in LibreOffice and ApacheOpenOffice, not in Calligra and not in MS PowerPoint2010. MS PowerPoint2013 has a general error in display of images with assigned filter and can not be taken as reference. The help text in LibreOffice and AOO says, "The graphic object is raised in brightness and reduced in contrast so that it can be used in the background as a watermark."

For an errata I suggest to exchange "transparent" with "pale".

We might consider to describe this filter in more detail in ODF1.3.

update: It turned out, that Calligra has implemented it in its current version to be a kind of transparent. So now we have an interoperability problem: It has been implemented as "pale" (making light) by OpenOffige.org and in sequal by LibreOffice and AOO over 10 years, and another application implemented it as transparent.