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Thanks in advance for those who will give me some light,
You asked a very general question. I'm not sure even I have an answer for you.
Let me try to answer your specific issues. One thing I should be clear about is that I am only talking about the 1st version of the Pixel Bender Plug-in for Photoshop CS4. Things will change over time.
You cannot access other Photoshop filters from within Pixel Bender. If you want to work in LAB space, you will need to do the conversion in your own filter.
If you could provide more specific questions, I can try to answer them...
thanks for your answer: I know my questions weren't too much brilliant, in part because they reflected my actual knowledge about programming. Now that I've digged a bit deeper in the subject, I could state them more precisely - in the meantime I've already found some of the answers: what I would have liked to ask, besides things that now appear to me quite obvious (like the impossibility to call PS filter from PB code), is simply related to the code function limitation. Loops and arrays, for instance. But the extra info that they won't work within flash only is enough to me, so PB looks as an appealing option anyway (hoping to not have those limits in the near future when I'll be able to import, somehow, PB filters within PS).
And reading between the lines makes me think PB language and support will grow and will be maintained (hope to see some built-in color management functions...).
Thanks again and best regards,