I have set an image style as a thumbnail, but it doesn't render as my thumbnail style. Instead, it is showing the original size of image. How can I solve this problem.
You can edit the content type and configure in the manage display fields. Go to
admin/structure/types/manage/article/display considering article is a content type.Replace 'article' with what every node type you have and change the image fields display options as shown in the screen shot.
change image format from 'mange display'.
- Navigate to the Content types page (Administer > Structure > Content types).
- In the table, locate the row that contains your content type and click the manage display link.
- Specify the "thumbnail" format.
- Click Save.