If you are a working with hardware (like an ESP32 or Arduino), you need a viewer that shows you the hex code or pixel map alongside the image. In this case, an image editor like GIMP or Photoshop is a better "viewer" because it provides a pixel grid.
If you open a 128x96 JPG in a standard OS previewer, it will usually: jpg 128x96 file viewer
The Ultimate Guide to 128x96 JPG File Viewers: How to Open and Edit Micro-Images If you are a working with hardware (like