Messing with the flag?

Above is a representation of the Iranian flag. Note the green stripe.

Below is a picture of a recent official ceremony in Iran, with a depiction of the flag (in the shape of Iran) in which green is replaced with blue.

Why is this? Is it a technical error? Or has it been changed because the reform movement has adopted green (a favorite Islamic color) to represent itself?

According to Radio Free Europe/Radio Liberty this is not the only case of blue/green substitution.