I've attached two files which show how to replace the hue of an image with a "hard-coded" hue and the hue from a different image (a gradient in this case), respectively.

Ivan Louette wrote:

Sorry for no replying earlier !

Thanks for the link and the explanations ! However at the moment I lack a lot of technical skills I am afraid... I would have time to learn programming but I must concentrate on my main project - writing a novel

• which progresses too slowly these months. This week end I was very

busy at cleaning the code of filters.svg ; the result (already spectacular this evening) will be commited on SVN probably tomorrow in the evening when I will have finished. Then I would concentrate on the french filters doc (this is my mother language) I began some weeks ago on Floss Manuals.

Have a nice week,

ivan