Convert tmTheme to sRGB color space
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tmTheme Color Convert

Many TextMate color themes were designed on Mac OS X, which used the Generic RGB color profile and a gamma of 1.8 by default. This results in the colors being darker if used directly on Windows.

For portability and compatibility with other editors and operating systems, it is better to use sRGB.

This script will convert the color values in a tmTheme file from Generic RGB to sRGB, optionally applying simple alpha blending with the foreground and background colors (for TextMate 2 themes before this change).

I wrote this while working on a blog post about the effects of color management on themes in text editors.


The scripts are written for Python 3. takes a tmTheme file and converts the color values from Generic RGB to sRGB. A gamma value to be used for the original file can be supplied, and optionally colors with alpha values can be blended with foreground/background color instead of copied.

usage: [-h] [-g GAMMA] [-b] infile outfile

Convert Generic RGB to sRGB.

positional arguments:
  infile                input tmTheme file
  outfile               output tmTheme file

optional arguments:
  -h, --help            show this help message and exit
  -g GAMMA, --gamma GAMMA
                        input gamma (default 1.8)
  -b                    blend alpha is a playground for working with color space conversions. It was used to compute the GenericRGBtosRGB matrix used in


These screenshots show the themes from the examples folder in Sublime Text 3 on Windows.

Original and sRGB version of Monokai:


Original and sRGB version of Railscasts:


Original and sRGB version of Tomorrow Night:

Tomorrow Night

Original and sRGB version of Twilight:



This projected is licensed under the terms of the MIT license.