.128 — NCSA Mosaic Image

NCSA (National Center for Supercomputing Applications) · 1993

Developer

NCSA (National Center for Supercomputing Applications)

Key Features

Early raster image format
Developed for NCSA Mosaic browser
Limited features compared to modern formats
Rarely used today

Best For

Understanding the history of web image formats
Viewing very old web content if conversion is possible

Less Ideal For

Modern web design and display
Achieving high image quality
Supporting transparency or animation
Cross-browser compatibility

Common Use Cases

Displaying simple images on early web pages
Archival of historical web assets from the Mosaic era

How to Open It

Attempt to open with an image viewer that supports a wide range of formats, like IrfanView or XnView.
Use a file conversion tool that might include legacy format support.
If the file is part of a historical archive, specialized software might be required.

What is a .128 file?

The .128 file extension is associated with an early image format developed by NCSA for the Mosaic web browser. It was designed to support basic image display within the nascent web environment. While it was functional for its time, it lacked advanced features like transparency or broad color support found in later formats. Consequently, .128 images are rarely encountered today, having been superseded by more versatile and widely adopted image standards.

Programs That Open .128 Files

Platform	Program
Windows	IrfanView	Free
	XnView MP	Free
macOS	Preview	Free	Official
	XnView MP	Free
Linux	GIMP	Free	Official
	ImageMagick	Free	Official

How to Convert .128 Files

Format	Method
.PNG	IrfanView, XnView MP, GIMP, ImageMagick
.JPG	IrfanView, XnView MP, GIMP, ImageMagick

Common Problems with .128 Files

⚠️ File cannot be opened by modern software.

Use conversion software like IrfanView or XnView MP, or the ImageMagick command-line tool, to convert the .128 file to a more common format like PNG or JPG. Ensure the converter has support for legacy NCSA formats.

⚠️ Image quality is poor or colors are inaccurate.

This format likely has limited color depth. Conversion to a modern format will not improve underlying quality; it will simply make it more accessible. There is no way to recover lost color information.

Frequently Asked Questions

Is the .128 format still used on the web?▼

No, the .128 format is obsolete and is not used for modern web development or image display.

Can I edit a .128 image?▼

While you might be able to open it in some graphics editors after conversion, its limited feature set means it's not ideal for editing. It's best to convert it to a format like PNG or TIFF for any editing tasks.

Why is this format so rare?▼

It was specific to the NCSA Mosaic browser and was quickly replaced by more capable and standardized formats like GIF and JPEG as the web evolved.

Technical Details

The .128 format is a proprietary image format used by NCSA Mosaic. It is a raster image format, meaning it stores pixel data. Specific technical details regarding its internal structure, compression methods, or color depth are not widely documented due to its limited use and obsolescence.

Did You Know?

NCSA Mosaic was one of the first graphical web browsers, paving the way for browsers like Netscape Navigator and Internet Explorer.

The development of the .128 format predates the widespread adoption of formats like PNG, which became a standard for web graphics offering transparency and lossless compression.

Security Information

As an old and rarely used format, .128 files pose minimal security risks compared to executable files. However, always exercise caution when opening files from unknown sources, as malicious code could potentially be embedded within any file type, though it's highly unlikely for this specific image format.