Tiago Filipe Silva added the comment:

Sorry for the late reply. I had to deal with stuff.

serhiy.storchaka:

> What tools did you use, optipng, advpng, pngcrush, pngnq, pngquant, or other? 
> How much space is saved?

I had half a crate of whiskey that day so I'm going to say optipng and pngcrush 
were used and if my recollection is good the saved space was ≈ 5 to 50 % 
depending on the file.

> Note that some tools remove an information about palette that makes files 
> displaying differently on different platforms and output devises.

I am aware of that. But if I understood correctly these files are rendered in 
documentation, and I don't think they're going to do this in a PlayStation 2. 
There may be complaints with Windows XP users because I remember for sure that 
optimized PNG files could not render very well back in those days.

haypo:

> I suggest to work on Sphinx to propose to implement this optimization on the 
> HTML rendering, maybe with optional external tools. What do you think?

Like you I'm very fond of a long-term proper solution and that is, by the way, 
the solution you deserve.

Unfortunately, I do not have the skills for provide that. I can only give the 
solution you need (which is smaller files).

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