Convert RGB to CG4

Why upload sensitive RGB files to online converters? reaConverter processes everything locally — convert to CG4 with zero cloud risk.

RGB to CG4 conversion is faster with the right tool. reaConverter handles everything from a few files to thousands in one batch. Processes files consistently every time, with full control over quality and output settings.

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How to Convert Multiple RGB Files to CG4?

1. Download and Install reaConverter

reaConverter is a standalone Windows app — download, install, and start converting RGB files in under two minutes.

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Install reaConverter

2. Load your RGB files

Open reaConverter and import your .rgb files. No file limits, no slowdowns. Add as many as you need.

Drag files into the window, use the Add Files button, or select entire folders.

Load your RGB files into reaConverter

3. Select CG4 as output format

Select CG4 as target format and pick where to save results. You can keep default settings or fine-tune the output.

Select CG4 as output format

4. Start RGB to CG4 conversion

Hit Convert to process your files. The log window shows progress, timing, and status for every file.

Start Conversion

Conversion complete? Your CG4 files are saved to the destination folder, ready to use.

RGB to CG4 Converter

reaConverter offers the fastest, simplest solution for converting your RGB files into CG4 in seconds - all files processed on your PC for maximum privacy and speed.

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Do more with your files

Converting RGB files for use in a workflow? reaConverter offers many ways to process files, so you can customize them according to your requirements.

Our range of editing options includes auto-processing options such as auto-rotate, auto-crop, watermarking and more. Change Color Space, copy Metadata, set DPI, manage ICC Profile, control Bit Depth.

Conversion features
Image editing

User Reviews

Average User Rating:
Last updated on January 19, 2026
"reaConverter saved our team hundreds of hours by digitizing decades of CG4 archives in weeks—not months. Its resolution scaling preserved every detail, even in files older than some team members!"
Anna K.
Anna K.
Satisfied Customer
"Finally an app that actually opens my weird files! Saves me from format frustration daily."
Kyle Brooks
Kyle Brooks
Happy User
"This converter delivers exceptionally quick format conversions with reliable results every time."
Brian White
Brian White
Happy User
"Security was our top concern when evaluating file conversion tools. reaConverter’s offline mode and role-based access controls let us lock it down for sensitive environments. No unexpected network calls or bloat — just clean, fast conversions. Even passed our pen-testing scans without a hitch."
Marcus White
Marcus White
Healthcare IT
"Your solution was buried deeper in search results than it should be. After struggling with unclear alternatives, I found your guides — finally, instructions that made sense for a first-time user like me. Excellent work!"
Richard E. Miller
Richard E. Miller
Satisfied Customer
"Converts files in seconds! Finally a tool that's both fast and simple to use."
Wei Chen
Wei Chen
Happy User

RGB to CG4 Conversion: FAQ

What are RGB files?

The RGB extension is associated with colour or black-and-white bitmap images released under the SGI (Silicon Graphics Image) format. Similar extensions include RGBA and BW. All were initially designed in the mid-1990s for use on Silicon Graphics workstations and are currently considered rare and obsolete.

What are CG4 files?

CG4 is a raster format associated with CALS (Continuous Acquisition and Life-Cycle Support) — a program initiated by the US Department of Defense to capture and link military data. CG4 is compatible with a very limited number of digital graphics programs. Files with this extension contain a bitmap that often uses the CCITT4 compression, which is an old fax machine standard used for black-and-white images.

Can reaConverter convert RGB to CG4?

Yes! reaConverter instantly converts .rgb to .cg4 with perfect quality preservation. With its batch processing feature, you can convert multiple files at once in just a few clicks. You can even convert images directly from Windows Explorer using the right-click menu — fast and convenient.

Can I convert RGB to CG4 online?

If you only need to convert a few RGB files to CG4 format, feel free to try our free online free online RGB to CG4 converter — perfect for small batches with no installation needed!

How can I turn RGB files into CG4 on my computer?

The best way to change RGBs to CG4s on your PC is to install a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch files conversions, including conversion from RGB to CG4.

How can I automate RGB to CG4 files conversion?

reaConverter supports all the most useful automation features such as right-click сonversion and Watch Folders for the most efficient automated files conversion in any software of this type.

Is there a way to convert RGB files to CG4 using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line rgb to cg4 converter for batch processing.

What else can I do with reaConverter?

Convert vector imagesConvert picture color spaceConvert Gerber imagesCrop pictureConvert CAD formats

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