/usr/share/radiance/conv2.cal is in radiance-materials 4R0+20110410-1build1.
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 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | {
Rcalc run to compute CRI and other factors from light source SPD
convolved with standard curves.
Used by scripts illumcal, reflcal.
Input is summed wavelength convolution used below.
}
Lp = $1; { photopic lumens or luminance }
Ls = $2; { scotopic lumens or luminance }
x_k = $3/($3+$4+$5); { source x }
y_k = $4/($3+$4+$5); { source y }
u_k = u_XYZ($3,$4,$5); { source u }
v_k = v_XYZ($3,$4,$5); { source v }
c_k = c_uv(u_k,v_k); { source c }
d_k = d_uv(u_k,v_k); { source d }
x10_k = $6/($6+$7+$8); { source x10 }
y10_k = $7/($6+$7+$8); { source y10 }
Yi(i) = select(i, $10, $13, $16, $19, $22, $25, $28, $31) * 100 / $4;
ui(i) = select(i,
u_XYZ($9,$10,$11), { u for reference color 1 }
u_XYZ($12,$13,$14), { u for reference color 2 }
u_XYZ($15,$16,$17), { u for reference color 3 }
u_XYZ($18,$19,$20), { u for reference color 4 }
u_XYZ($21,$22,$23), { u for reference color 5 }
u_XYZ($24,$25,$26), { u for reference color 6 }
u_XYZ($27,$28,$29), { u for reference color 7 }
u_XYZ($30,$31,$32) { u for reference color 8 }
);
vi(i) = select(i,
v_XYZ($9,$10,$11), { v for reference color 1 }
v_XYZ($12,$13,$14), { v for reference color 2 }
v_XYZ($15,$16,$17), { v for reference color 3 }
v_XYZ($18,$19,$20), { v for reference color 4 }
v_XYZ($21,$22,$23), { v for reference color 5 }
v_XYZ($24,$25,$26), { v for reference color 6 }
v_XYZ($27,$28,$29), { v for reference color 7 }
v_XYZ($30,$31,$32) { v for reference color 8 }
);
ci(i) = c_uv(ui(i),vi(i));
di(i) = d_uv(ui(i),vi(i));
u_XYZ(X,Y,Z) = 4*X/(X+15*Y+3*Z);
v_XYZ(X,Y,Z) = 9*Y/(X+15*Y+3*Z);
c_uv(u,v) = (4-u-10*v)/v;
d_uv(u,v) = (1.708*v+.404-1.481*u)/v;
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