https://www.udemy.com/course/complete-youtube-thumbnail-course/
In this course you will learn all about the structure of a thumbnail. From the right size and resolution of a YouTube thumbnail to how to enhance a background picture by finding a balance between shadows and highlights. You will learn how to make thumbnails for a wide variety of different types of videos.

Your teacher will also show you how vibrance and brightness can help with making a thumbnail stand out and how to improve resolution of a picture with the filters.

You will become an expert in how to quickly and easily change colors of a whole photo or only one object by using hue and saturation. You will also learn a quick and easy way to make cutouts with the quick selection tool, different ways to make a cutout stand out on a busy background, and how to properly put text on a thumbnail.

All this and so much more in just a few hours of instruction from a teacher with years of great experience in making incredible thumbnails!

What you’ll learn
How to add text to a thumbnail
How to make and save it in the right size for YouTube
Tricks to get the most perfect colors
The best ways to make your thumbnails stand out
Requirements
A desire to learn how to make the best thumbnails
Access to Photoshop
Creativity!