I am using the composite node editor to alter an image but i would like to remove its blue background, is there a node that keys out (gets rid of) certain colours or a way of bringing in an image where blender recognises layers or better still a transparent background from photoshop for example?
the blue background is your default world setting and can be nothing or anything you want. see http://mediawiki.blender.org/index.php/Manual/Worlds_and_Backgrounds. You dont need any new builds to do what you want. To use an image as a background, see the wiki on backbuf in Render
i’m nearly there but the CVS Build i need by bob - see above - isnt in OSX format so there has to be another way to do it using the blend build i have already, oh and i cant get the patch to work, think the link is dead. also i dont want to composite onto a background image i want to composite into a blender scene already built, the composited image is static as well not a moving image so dont think i should have to use billlboards…any further assistance would be great, thank you!