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Please remember what I've written above:

A correctly build url should automatically download and process channel logos from Server side and return it via the HTTP response. At least all german channels do have logos in the repository.

For the url take a look at https://github.com/MediaPortal/MediaPortal-2/blob/b0074644713b78aa2a6a203b5eef18c69582a1e3/MediaPortal/Source/UI/FanArt/FanArtService.Client/FanArtImageSource.cs#L212-L219.