How can I rotate images depends on a specific angle ?

edit

all images comes in different angles are these methods detect angle and then rotates ?

Sorry, but these questions can easily be solved by reading to documentation.

@FooBar I think his problem is more complex than you are suggesting. He thinks that these techniques will automatically detect the angles. Applying a rotation in this case is easy peasy, getting the correct angle for the rotation is far more difficult ...

Then I am sorry that I tried to help you. Won't happen again.

@Rodrane, instead of posting such a ridiculous response put some effort in and answer to remarks made. For example I wondered if you knew the angle to rotate, if not, than please fill in more info.... And looking at your SO topic I am even more baffled, why not share all that info here also and stop complaining?

I am not complaining I was kindly told all images can come in different angles those methods can detect angle and rotated based on this angles.

but his answer was like I did not read documentation thousand times.

And could you please stop removing your comments and altering your posts? That's just childish.

@FooBar, lets back down here. Since he doesnt want any clear help just ignore him. Thought it is kind of stupid to remove all the info from the SO topic.

I just don't want to be part of weird conversation. actually tried delete post but system does not allowed me.

@RR14 you are not part of a weird conversation, now you are simply making others look plain idiots :)