Hi Chinnu,
thanks for your fast answer.
Yes of course this method is possible, but I was hopping to avoid one more layer in the page
I thought that because acrobat reader permits to change the background color in its interface, that was just a parameter, not one more object.
But if you say the PDF sta,ndard does not have that parameter for page, then ... no choice ... leave it like that
FYI, my reasons:
I have noticed that if the page has many layers/objects (...) per page, there is some visual glitch when reading the pdf in acrobat reader
The page is constructed by adding the elements while scrolling, and with the above method, the page is first displayed white, and very soon after the color changes ; this process is fast but noticeable to the eyes & not very pleasant (not SF fault here, just the method of acrobat & likely the speed of the computer)
This is the same with the other objects in the page, but here much more visible as it changes the whole color in the page, so a big surface
But OK, leave it like that ; nothing more to do here
Thanks again,
Fabrice