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Loper · Colorists & finishing

Open .spimtx files on your Mac.

.spimtx

A 3x4 color matrix for OpenColorIO, one output channel per row with an offset at the end.

Loper is a free, minimal editor for macOS that opens OpenColorIO matrix (.spimtx) instantly and colors every part of the file, so you find the value you need at a glance and can fix it right there. No IDE, no project to load, no gray wall of text.

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ap0_to_ap1.spimtx opened in Loper: OpenColorIO matrix (.spimtx) with color-coded LUT (cube, 3dl)
Show the file as text
1.4514393161 -0.2365107469 -0.2149285693 0-0.0765537734 1.1762296998 -0.0996759264 00.0083161484 -0.0060324498 0.9977163014 0

How to open .spimtx files

  1. Download Loper (free, Apple silicon, signed and notarized) and move it to Applications.
  2. Double-click your .spimtx file, drag it onto the Loper window, or right-click it and choose Open With › Loper.
  3. Want every .spimtx file to open in Loper? Choose Loper › Make Loper the Default Editor….

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