How to get video/channel preview immage?

Hi everyone,
didnt found it in help, so asking.

How can i get url of channel/video preview image?

this is not a help forum its for questions related to the API and SDK.
you can send a e-mail to the support.

http://help.twitch.tv/customer/portal/emails/new

You can find the channel preview image in the /streams/:channel/ resource under stream.preview (only when the channel is live)
https://github.com/justintv/Twitch-API/blob/master/v2_resources/streams.md#get-streamschannel