What is an RGB file?
RGB (also known as SGI RGB) is a raster image format developed by Silicon Graphics Inc. (SGI) for use on their workstations. RGB files store image data in uncompressed or run-length encoded (RLE) format using red, green, and blue color channels. The format also supports an alpha channel, in which case the file uses the .rgba extension.
RGB files were widely used in professional 3D graphics, visual effects, and scientific visualization workflows on SGI workstations. Our Online RGB Viewer lets you open .rgb and .rgba files instantly in your browser without installing any specialized software.
How to View RGB Files Online
Upload RGB File
Drag and drop your .rgb or .rgba file onto the viewer, or click to browse and select it from your device.
Inspect the Image
The viewer decodes the SGI RGB data and displays the image with correct colors and transparency if present.
Download or Convert
Save the rendered image to your device as a standard PNG or JPG file if needed.
Frequently Asked Questions
What is the difference between .rgb and .rgba?
.rgb files contain three color channels (red, green, blue), while .rgba files include an additional alpha channel for transparency. Both use the same SGI image format.
What software normally opens RGB files?
RGB files are traditionally opened by SGI-compatible tools, GIMP, Photoshop (with plugins), or ImageMagick. Our online viewer lets you open them without installing any software.
Can I convert RGB to PNG or JPG?
Yes. After opening your RGB file in the viewer, you can download the rendered image as a PNG or JPG file.
Is the RGB format the same as the RGB color model?
No. The RGB color model describes how colors are represented using red, green, and blue values. The .rgb file format is a specific SGI image file format that happens to use the RGB color model for its pixel data.