If you want to view the full resolution of an image in the gallery under screenshots/clips.
On which in the post you are only limited just viewing the thumbnail or resized image to fit the box.
You can view the full image in 2 easy steps:
1. Right Click on Image
2. Open Image in New Tab
This will open the image a new window to view the full resolution of the image link.
Before I learned this, I would upload the photo to my Imgur and then attach the link to the posted photo. Helpful tip Leon!