Alias PIX
Alias PIX is a raster image file format. It supports 24-bit "true-color" images, and uses run-length encoding.
For all practical purposes, it is identical to Vivid IMG format, though there might be a small difference in how the unimportant fields are defined.
There is also a (rare?) 8-bit single-sample variant, which might technically be called "Matte" format, instead of "PIX".
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Disambiguation
ImageMagick calls Alias PIX Alias/Wavefront RLE image format. This is potentially confusing, because a different format, RLA, is also associated with Alias|Wavefront, and also uses RLE compression.
Format details
An Alias PIX file has a 10 byte header, followed by the pixel data.
Identification
Robust identification of an Alias PIX file from its contents is challenging.
The field at offset 8 is 24 (00 18), or 8 for Matte format.
The field at offset 4 (x-offset) is almost always 0.
The field at offset 6 (y-offset) is almost always 0, or one less than the height, or equal to the height.
Other tests could be to check that the dimensions seem sane, or to decompress part of the image and check for errors.
Specifications
- Alias PIX File Format Information
- Autodeks website: Alias Pix image file
- Autodesk website: Matte file
See also Vivid IMG#Specifications.
Software
- ImageMagick (format named "PIX"; read-only)
- Deark
- XnView
