Image file names have prefix with size added after upload to website - is this affecting SEO?

We rename all our image file names for SEO. When images are uploaded to our site this image is regenerated to fit the layout and the size is being appended to the new generated image. For example, I uploaded "Rose-Garden-House.jpg" and the generated image name on the site is "med_Rose-Garden-House.jpg" or "sml_Rose-Garden-House.jpg". Is this appending the size to the filename interfering with any SEO benefits to the optimized file names or is the effect on SEO negligible?