Image with overlay text, containing token does not replace in "image_style_url" image

I have an image style, including textimage layer with text, which is the token `[file:author]`. Everything works fine when I render the image from the theme with ` print render($content['field_image']) ` and I get the desired result. However, when I want to get a URL programatically with `image_style_url('style_name_with_textimage', 'public://file')` the token is not replaced and I see the text "[file:author]" instead for example "George Smith".