Use the HSV shader then, not HDR. HDR is for "mimicking" the results of an HDR photo, but it's not very accurate, and it's not meant to recolor an image, only a rather "smart touch-up". If you wish to increase the saturation of the image, try using HSV which allows you to change value, saturation and hue separately.
And jumping on that bandwagon:
Spoiler!
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