>The following article describes very well what HDR is all about
>
>http://iphonephotographyschool.com/hdr/
>
>(I know you didn't ask for it but I am so excited that I learned something new, I can't resist :)). The author mentions the app ProHDR which cost the whole $1.99 so I may skip my afternoon coffee and go for it :).

Thanks for the link!