HDR's

Although no wallpaper should be disqualified from and by a well meaning up loaders, it should be understood that HDR refers to the technical method of taking a photo, not it's content. 3D, abstract, textured or fantasy are beautiful, but unless they are photographed in HDR, they belong in different groups. Keep up the good work.

Its hard to know if it was unless I took the photo. Could you be more specific as to how an HDR differs from a high pixel density or size?

I don't think technical explanations will help you understand the true meaning of HDR. What you should do is search your internet explorer for photos or wallpapers in HDR and get a feel of how those type of images look. It has nothing to do with pixels density or image size, rather the technique of light and dark, and intensity and sharpness in setting up the shot. But please don't worry, this is not a professional level group. Do your best and use your own judgement and it will be fine.

The way I see it, HDR Photos have more rich colours, if I can call it that.