An MPEG encoder should not alter colour saturation. MPEG compression artefacts are caused by too low a bitrate. I would say the problem lies with your settings in Vegas' encoder, rather than your technique/workflow.
An MPEG encoder should not alter colour saturation. MPEG compression artefacts are caused by too low a bitrate. I would say the problem lies with your settings in Vegas' encoder, rather than your technique/workflow.