Owell, I found the answer to my question. I guess I should'nt have rushed to post the question. To anyone else interested the following fixes the problem. Im still looking for an answer (or some hints) on the second part of my initial question. 
sub update_image {

    my $data = encode_base64( get($CAM_URL) );
    
    $buttonImage->configure(-data => $data, -format => 'jpeg');

    $TT->configure(-image => $buttonImage);

    $mw->after( $UPDATE_INTERVAL,[\&update_image]);
    
};

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In reply to Re: TK Photo Cam - Memory Leak by Anonymous Monk
in thread TK Photo Cam - Memory Leak by Anonymous Monk

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