SIX to RGB Converter

Transform SIX images into lossless RGB online

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File Privacy First

Uploaded SIX images and converted RGB results are automatically purged — originals immediately, outputs within 24 hours.

Simple Workflow

Upload SIX, pick RGB, download the result — the three-step process makes converting legacy formats effortless for anyone.

Retro Graphics Export

SIX encodes images for vintage DEC terminals. Converting to RGB extracts that artwork into a format modern tools understand.

How to convert SIX to RGB

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose rgb or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your rgb file right afterwards

About formats

SIX is a file extension for SIXEL (Six Pixel) graphics data, a bitmap graphics format developed by Digital Equipment Corporation (DEC) in 1983 and introduced with the LA50 dot matrix printer. SIXEL encodes images as a sequence of printable ASCII characters, where each character represents a column of six vertical pixels (a 'sixel') — the character's ASCII value minus 63 provides a 6-bit binary pattern, with each bit controlling one pixel in the vertical column. The encoding is structured as a series of sixel bands (each six pixels tall) across the image width, with control sequences for color selection (up to 256 registers with HLS or RGB specification), repeat counts (run-length encoding for efficiency), carriage return, and newline commands. SIXEL data is transmitted to the output device using DEC's standard escape sequence protocol, embedded within the text stream alongside regular character output. Originally designed for DEC's line of printers and later supported by DEC VT-series terminals (VT240, VT330, VT340), SIXEL has experienced a remarkable revival in modern terminal emulator software. One advantage is terminal-native image display: SIXEL allows images to be rendered directly within a text terminal session without requiring a graphical window system, enabling command-line tools to display graphs, photographs, and previews inline with text output. This capability has driven adoption in modern terminals like mlterm, xterm, WezTerm, and foot. SIX/SIXEL data can be generated by ImageMagick, libsixel, and chafa, and viewed in any SIXEL-capable terminal emulator.
Initial release: 1983
RGB is a raw (headerless) image format that stores pixel data as a flat sequence of red, green, and blue sample values with no container structure, compression, or metadata. Each pixel is represented by three consecutive bytes (in 8-bit mode) — one for red intensity, one for green, and one for blue — written in scanline order from the top-left corner of the image to the bottom-right. Because there is no header, the image dimensions and bit depth must be specified externally when reading the file. The format supports multiple bit depths: 8-bit (0-255 per channel), 16-bit (0-65535 per channel), and floating-point variants, with 8-bit being the most common. The RGB color model itself reflects how display hardware produces color — by mixing red, green, and blue light at varying intensities — and raw RGB files represent this model in its most direct digital form. With 8-bit channels, three bytes per pixel yield a 24-bit color palette capable of representing 16,777,216 distinct colors. One advantage is zero-overhead processing: without headers or compression to parse, raw RGB data can be memory-mapped, fed directly into GPU textures, or piped between processing stages with minimal latency — valuable in real-time imaging, scientific instrumentation, and computer vision pipelines where every millisecond matters. The format's universal simplicity provides another practical strength — any programming language can read or write raw pixel data with just basic file I/O, making it a reliable interchange format between custom software that may not share support for structured image containers. Raw RGB files are handled by ImageMagick, FFmpeg, and various scientific and graphics tools.
Initial release: 1990

Frequently Asked Questions

Why convert SIX to RGB?

SIX encodes images as text for DEC terminals — useless outside that environment. Converting to RGB yields a standard image you can use anywhere.

What programs can open RGB?

GIMP, Photoshop, Blender, and IrfanView open SGI RGB images. This format was standard on Silicon Graphics workstations.

How accurate is SIX to RGB conversion?

RGB preserves image data without lossy compression, so the visual content from your SIX is retained faithfully during conversion.

Is SIX to RGB conversion fast?

The process is fast — cloud-based processing handles SIX to RGB conversion in seconds for standard-sized images, even on slower connections.

Does Convertio support batch SIX to RGB conversion?

Batch conversion is supported. Queue as many SIX files as you need and convert them all to RGB in a single run — no repeating steps manually.

Can I convert terminal screenshots?

If the screenshot is saved as a SIX file with SIXEL encoding, yes. Upload it to Convertio and convert to RGB for universal viewing.