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Black Darter (Sympetrum danae). Also other photos of your are this species.
The two-colored pterostigma would make this Lestes barbarus
Not a Scarlet Darter, but a Sympetrum species, probably Sympetrum vulgatum.
Not Anax imperator for sure.It could be Orthetrum sabina, but I am not very much acquinted with the draginfly species in Iran.
You could submit it to http://observado.org/ and ask on the forum there, because there are experienced people who know much more then I do.
Looks more like S. vulgatum to me, the Vagrant Darter. This photo is a male, not a female.
It is a Red-veined Darter (Sympetrum fonscolombii). The wildaboutspain link also shows a Red-veined Darter. The Scarlet Darter has a very broad abdomen, this one hasn't. Then there is the lighter (yellowish) stripe on the side of the thorax, which also points to Red-Veined Darter. One more: look at the color of the legs. Red-veined has that black-with-yellow, Scarlet has much lighter colored legs.
If you look at the photo you'll see that the female is quite different from the male in terms of pattern on the abdomen. The male has small dark rings in the blue, the female has torpedo-like figures.
One very important lesson when id-ing dragonflies/damselflies is that the pattern is much more important than the color. In fact most species can be identified from black-and-white photos.
It is a female as is shown by the white spot at the end of the wing (pseudopterostigma). Males do not have that.
