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Using theme_preprocess_node i’m trying to add a class to all images on the page

My code below is not working and i’m not sure why. I’ve tried a few variants. according to the KPR variables output, the image I’m trying to access is here.

$variables[‘field_about_image’][0]

i think the 0 signifies it is the first (and only in this case) image on the page w/ the machine field name ‘field_about_image’. so i wrote my code as:

function myTheme_preprocess_node(&$variables){     if($variables['type']=='basic_page_with_pic') { echo '<script>alert("my func running")</script>'; //Verified it's working     $variables['field_about_image'][0]['class'] = 'myclass; } }

i’ve also tried this, just to get a class attribute added 

$variables['field_about_image'][0][] = 'class';

also the title attribute comes up as empty. so just as an execrcise i tried this.

$variables['field_about_image'][0]['title'] = 'some title;

any help on how to do this would be greatly appreciated!

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Using theme_preprocess_node i’m trying to add a class to all images on the page

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