It takes care of resizing photos, creating thumbnails, re-encoding videos to a web -friendly format, Thumbsup is free, and the source code is hosted on Github.
How to Use Premiere Pro's Thumbnails as Source Monitors with Master Clip Effects and More! This tutorial will help you get more out of thumbnails in Premiere Pro. By default, the first frame is used as the clip's thumbnail, or "poster frame" as it's referred to in Premiere Pro.
ThumbsUp for Mac makes lower resolution versions of your images with on top of the app's icon in order to initiate the thumbnail generation.
ThumbsUp - Thumbnail picture generator. Download the latest versions of the best Mac apps at safe and trusted MacUpdate.
As SageThumbs is a Windows Explorer context menu extension, there is no an executable file that you should launch to bring it up. To use it, just open any.