Would it be possible to create an internal image viewer plugin for Sublime Text 3? I noticed in their forum people have mentioned it not possible for ST2 due to the fact that the API doesn't allow access to the UI and widgets, but just wondered if it was still the case for ST3?
Sublime Text 3 now has a built in image preview.
It also provides provides simple information about the image such as pixels & size of the image in the status bar. This feature was first introduced in development build 3055 with the build after adding checkered backgrounds for transparent images.
There is nothing yet in Sublime Text 3. It would be nice to preview the image and its dimensions right inside of sublime. For now, you will have to open in finder/browser/whatever you use.
来源：https://stackoverflow.com/questions/18329995/sublime-text-3-internal-image-viewer