External HD projector DVI / Thunderbolt / HDMI ?

Hi
I have two MBPs , one vs10.5 and a recently bought one with vs 10.9 installed.
I do Video movies in HD 1920 x 1080, which I project on a large screen using an HD 1920 x 1080 projector.
With my 10.5, I connect it to the projector using a DVI to HDMI cable, and it works fine.
With my 10.9 , I connect it  to the HDMI input of the projector using the Thunderbolt port to an HDMI cable via an adaptor.
The latter produces a very wishy - washy picture ... flat, dull, no contrast etc ... I can boost the settings of my rojector to get a better picture, but it still does not equals the quality of the picture I get with my 10.5 using the DVI to HDMI cable.
I am thinking of getting an adaptor to connect my 10.9 MBP Thunderbolt terminal to a DVI adaptor and then on to my HDMI cable.
Has anyone experienced a similar situation ?
Cheers and all the best for 2014
jcr

Thank you Malcolm.
As you state, they use the same signals. I bought a Display port adaptor to DVi and it is the same. I shall have the unit checked out.

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