Dynapik offers a free online tool to change image types - no need to download anything. It's quick and easy to use. You can change your TGA images to JNG format. This tool works for both professionals and casual users. Convert your images to JNG in seconds.
Truevision TGA (Targa)
The simple, reliable workhorse of video game textures.
TGA (Truevision Graphics Adapter), often called TARGA, is a raster graphics file format created in 1984. It was the first truecolor (24-bit) format for PC cards. Despite its age, it remains incredibly popular in the video game industry and broadcast graphics because it supports an alpha channel (32-bit images) and is extremely simple to parse.
A TGA file starts with an 18-byte header, followed by image identity information, optional color map, and then the pixel data. The pixel data can be raw or RLE compressed. The 32-bit version (RGBA) is particularly valued because the alpha channel is stored as a simple 4th byte per pixel, making it trivial for game engines to use.
Developed by Truevision for their TARGA and AT-Vista boards, which brought broadcast-quality video graphics to the IBM PC. It became the lingua franca of VGA graphics.
JPEG Network Graphics
JPEG compression with PNG transparency.
JNG (JPEG Network Graphics) is a sub-format of the MNG animation format. It was designed to combine the high compression of JPEG with the alpha transparency features of PNG, something that standard JPEG lacks. It essentially wraps a JPEG stream and a mask channel in a chunk-based container.
A JNG file structure mimics PNG. It uses a 8-byte signature and chunks. The image data is split into a color chunk (JDAT) which contains JPEG data, and an alpha chunk (IDAT) which contains PNG-compressed alpha mask. This allows for 'lossy color, lossless alpha' images, which is very space-efficient for photographic sprites.
Created by the PNG Development Group around 2001 as part of the MNG (Multiple-image Network Graphics) project. It failed to gain traction as MNG was rejected by Mozilla and Chromium in favor of APNG and later WebP.
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