How-to (easily) retrieve the ColorSpace at the page level

Hello,
I'm lloking for a method to (easily) retrieve the ColorSpace at the page level. Actually in my PDF there are ColorSpace at page level and also at element level.
Moreover what is the behavior when there are more than one ColorSpace. Is it the ColorSpace described at the page level which is taken into account or the ColorSpace which is at the image level.
Thanks in advance,
Joe

There is no such thing as a "page level CS" in PDF. So I have no idea what you are referring to. Please post a PDF.
When rendering a page, a renderer (Acrobat/Reader in this case) decides what final output colorspace to use for the raster image based on a variety of criteria defined by the appropriate international standards - let's call this the "destination CS". Once chosen, then as each object is being rendered its colorspace(s) (call them "source CS" - may be one or two) will be converted, if necessary to the destination CS.
That's the simplistic description of color handling when there is no transparency on the page. If there is transparency involved - the complexity goes up by a magnitude...

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How-to (easily) retrieve the ColorSpace at the page level

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