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Thanks for the answers. Altough I took your advice and changed the way I structure the node and do the actual stuff outside the __init__ function, the image viewer does not display my images. However, I wrote a subscriber node and subscribed to the image topic and can receive images just fine. So I guess the problem is actually displaying it not about the node itself. I can see the images on rviz right now so will close the topic. Thanks!

Thanks for the answers. Altough I took your advice and changed the way I structure the node and do the actual stuff outside the __init__ function, the image viewer does not display my images. However, I wrote a subscriber node and subscribed to the image topic and can receive images just fine. So I guess the problem is actually displaying it not about the node itself. I can see the images on rviz right now so will close the topic. Thanks!everything works fine.