loper

Loper · Colorists & finishing

Open .ctl files on your Mac.

.ctl

ACES Color Transformation Language with C-style highlighting.

Loper is a free, minimal editor for macOS that opens ACES CTL 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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RRT.ctl opened in Loper: ACES CTL with color-coded CTL / C
Show the file as text
// Reference Rendering Transform (excerpt)const float RRT_GLOW_GAIN = 0.05; void main(input varying float rIn, input varying float gIn,          output varying float rOut, output varying float gOut){  float saturation = 0.96;  rOut = rIn * saturation;  gOut = gIn * saturation;}

How to open .ctl files

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

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