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 XBM images to JNG format. This tool works for both professionals and casual users. Convert your images to JNG in seconds.
X BitMap
Images written as C source code.
XBM (X BitMap) is a unique image format that is actually a valid snippet of C source code. It defines an array of bytes representing a monochrome bitmap. Because it is code, it can be compiled directly into an application binary, which made it the standard for X11 icons and cursors.
An XBM file contains `#define` statements for width and height, and a static array of unsigned chars: `static unsigned char image_bits[] = { 0x00, 0xFF, ... };`. It supports only 1-bit color (black and white). Transparency works by defining a mask.
The original format for X Window System bitmaps (X10/X11). Used extensively in the 90s for the early World Wide Web (Mosaic browser) before GIF/JPEG took over.
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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