Changing Target width/height for header

Hi guys,
I am struggeling to figure out how to chnage the target width/height for header image and thumbnail for the blog. Is there a section in the interface to do it or do i need to digg in the file system somewhere?

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studiollama replied on at Permalink Reply
I am having the same issue, I need to be able to change this. Have you been able to figure this out?
studiollama replied on at Permalink Reply
Well, after hours of looking I finally ran across this:
Which in the second comment states the files are located at concrete/blocks/image/composer in your website directory. Inside the header.php or thumbnail.php file you will find the target width/height and can change it.