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 JPM images to TGA format. This tool works for both professionals and casual users. Convert your images to TGA in seconds.
JPEG 2000 Compound Image
JPEG 2000 for multi-layer documents.
JPM (JPEG 2000 Part 6) is a compound image file format. It is designed for storing document images that contain a mix of text and graphics, using a Mixed Raster Content (MRC) model. It allows for different compression methods to be applied to different 'layers' of the image (e.g., sharp edges for text, smooth gradients for photos).
JPM splits an image into multiple layers (e.g., background, foreground mask, foreground color). Each layer can be compressed differently (e.g., JBIG2 for text mask, JPEG 2000 for background photos), optimizing both quality and file size for scanned documents. This is significantly more efficient than compressing an entire scanned page as a single JPEG 2000 image.
Part of the JPEG 2000 standard (ISO/IEC 15444-6), specifically targeting the document archival market.
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.
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