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 WPG images to JNG format. This tool works for both professionals and casual users. Convert your images to JNG in seconds.
WordPerfect Graphics
The clip art format of the WordPerfect era.
WPG (WordPerfect Graphics) is a file format associated with Corel's WordPerfect word processor. It can contain both vector graphics (lines, curves) and raster graphics (bitmaps), making it a 'metafile' similar to WMF.
There are two main versions: WPG1 (WordPerfect 5.0) and WPG2 (WordPerfect 6.0). WPG1 is strictly 16-color or 256-color. WPG2 supports up to 24-bit color and more advanced vector commands. ImageMagick primarily supports reading the raster components.
Dominant in the late 80s/early 90s when WordPerfect was the market leader for word processing, before the rise of Microsoft Word.
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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