Colour loss when saving PNGs.

Hi there,
I'm fairly new to photoshop and am having a few difficulties when saving a PNG.
I'm using a Mac Book Pro.
I'm using Photoshop CS6.
The problem I'm encountering is when I save a PNG file I'm losing a lot of colour saturation. It goes from a vibrant red to a dull red colour.
The workspace is RGB 8bit.
I'm using the SAVE AS function because I don't want it for web I need it for print and I need the transparent background too.
The only way I've managed to get the full colour is by using the save for web option and selecting PNG-24.
Any help would be greatly appreciated.

I'm using the SAVE AS function because I don't want it for web I need it for print and I need the transparent background too.
Then I see no reason for using png but think you should use psd.
The workspace is RGB 8bit.
Workspaces are something completely different in Photoshop (and concern Panels, Menus etc,) and RGB is not a Color Space but a Color Mode.
What is the image’s Color Space or if it isn’t embedded what is your RGB Working Space (Edit > Color Settings)?

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http://i25.tinypic.com/4ta5ah.png
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