The OPO does not use a Super AMOLED device so colors seem different, blacks are more grays. You can adjust it accordingly by using the custom presetting

Try http://forum.xda-developers.com/show...08&postcount=6
Adjust the settings around till you get it the way you want it.
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OnePlus One: Mahdi | Franco Kernel
Older devices: Nexus 5, Nexus 4, Galaxy Nexus, TF101, Nexus S, Samsung Vibrant, G1