/usr/share/foo2zjs/gamma.ps is in printer-driver-foo2zjs 20111202dfsg0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | %%
%% This is for fooling around with color correction. None of the
%% values in this file are tuned for the 2300 DL yet. So far, I
%% have not come across a *process* for determining what should go
%% into this file. Also see "gamma-lookup.ps" for another approach.
%%
%% This defines a set of four PS procedures, one for each of C, M, Y, and K,
%% whose input is a value in the range 0.0..1.0, and whose output should be
%% a corrected value in the same range.
%%
%% CYAN MAGENTA YELLOW BLACK
%{0.217 exp} {0.217 exp} {0.217 exp} {0.217 exp} setcolortransfer
%{0.256 exp} {0.256 exp} {0.256 exp} {0.256 exp} setcolortransfer
{0.333 exp} {0.333 exp} {0.333 exp} {0.333 exp} setcolortransfer
%{0.450 exp} {0.450 exp} {0.450 exp} {0.450 exp} setcolortransfer
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