9 |
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#include <math.h> |
10 |
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#include "ccolor.h" |
11 |
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|
12 |
+ |
/* Sharp primary matrix */ |
13 |
+ |
float XYZtoSharp[3][3] = { |
14 |
+ |
{ 1.2694, -0.0988, -0.1706}, |
15 |
+ |
{-0.8364, 1.8006, 0.0357}, |
16 |
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{ 0.0297, -0.0315, 1.0018} |
17 |
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}; |
18 |
+ |
/* inverse Sharp primary matrix */ |
19 |
+ |
float XYZfromSharp[3][3] = { |
20 |
+ |
{ 0.8156, 0.0472, 0.1372}, |
21 |
+ |
{ 0.3791, 0.5769, 0.0440}, |
22 |
+ |
{-0.0123, 0.0167, 0.9955} |
23 |
+ |
}; |
24 |
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|
25 |
< |
C_COLOR c_dfcolor = C_DEFCOLOR; |
25 |
> |
const C_COLOR c_dfcolor = C_DEFCOLOR; |
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|
27 |
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/* CIE 1931 Standard Observer curves */ |
28 |
< |
static C_COLOR cie_xf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
28 |
> |
const C_COLOR c_x31 = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
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{14,42,143,435,1344,2839,3483,3362,2908,1954,956, |
30 |
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320,49,93,633,1655,2904,4334,5945,7621,9163,10263, |
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10622,10026,8544,6424,4479,2835,1649,874,468,227, |
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114,58,29,14,7,3,2,1,0}, 106836L, .467, .368, 362.230 |
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}; |
34 |
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static C_COLOR cie_yf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
34 |
> |
const C_COLOR c_y31 = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
35 |
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{0,1,4,12,40,116,230,380,600,910,1390,2080,3230, |
36 |
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5030,7100,8620,9540,9950,9950,9520,8700,7570,6310, |
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5030,3810,2650,1750,1070,610,320,170,82,41,21,10, |
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5,2,1,1,0,0}, 106856L, .398, .542, 493.525 |
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}; |
40 |
< |
static C_COLOR cie_zf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
40 |
> |
const C_COLOR c_z31 = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
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{65,201,679,2074,6456,13856,17471,17721,16692, |
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12876,8130,4652,2720,1582,782,422,203,87,39,21,17, |
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11,8,3,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, |
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106770L, .147, .077, 54.363 |
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}; |
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/* Derived CIE 1931 Primaries (imaginary) */ |
47 |
< |
static C_COLOR cie_xp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
47 |
> |
static const C_COLOR cie_xp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
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{-174,-198,-195,-197,-202,-213,-235,-272,-333, |
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-444,-688,-1232,-2393,-4497,-6876,-6758,-5256, |
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-3100,-815,1320,3200,4782,5998,6861,7408,7754, |
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8336,8336,8336,8336,8336,8336}, |
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127424L, 1., .0, |
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}; |
55 |
< |
static C_COLOR cie_yp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
55 |
> |
static const C_COLOR cie_yp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
56 |
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{-451,-431,-431,-430,-427,-417,-399,-366,-312, |
57 |
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-204,57,691,2142,4990,8810,9871,9122,7321,5145, |
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3023,1123,-473,-1704,-2572,-3127,-3474,-3704, |
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-4066,-4066,-4066,-4066,-4066,-4066}, |
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-23035L, .0, 1., |
62 |
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}; |
63 |
< |
static C_COLOR cie_zp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
63 |
> |
static const C_COLOR cie_zp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
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{4051,4054,4052,4053,4054,4056,4059,4064,4071, |
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4074,4056,3967,3677,2933,1492,313,-440,-795, |
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-904,-918,-898,-884,-869,-863,-855,-855,-851, |
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36057L, .0, .0, |
70 |
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}; |
71 |
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|
72 |
+ |
|
73 |
+ |
/* convert to sharpened RGB color for low-error operations */ |
74 |
+ |
void |
75 |
+ |
c_toSharpRGB(C_COLOR *cin, double cieY, float cout[3]) |
76 |
+ |
{ |
77 |
+ |
double xyz[3]; |
78 |
+ |
|
79 |
+ |
c_ccvt(cin, C_CSXY); |
80 |
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|
81 |
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xyz[0] = cin->cx/cin->cy * cieY; |
82 |
+ |
xyz[1] = cieY; |
83 |
+ |
xyz[2] = (1. - cin->cx - cin->cy)/cin->cy * cieY; |
84 |
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|
85 |
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cout[0] = XYZtoSharp[0][0]*xyz[0] + XYZtoSharp[0][1]*xyz[1] + |
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XYZtoSharp[0][2]*xyz[2]; |
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cout[1] = XYZtoSharp[1][0]*xyz[0] + XYZtoSharp[1][1]*xyz[1] + |
88 |
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XYZtoSharp[1][2]*xyz[2]; |
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+ |
cout[2] = XYZtoSharp[2][0]*xyz[0] + XYZtoSharp[2][1]*xyz[1] + |
90 |
+ |
XYZtoSharp[2][2]*xyz[2]; |
91 |
+ |
} |
92 |
+ |
|
93 |
+ |
/* convert back from sharpened RGB color */ |
94 |
+ |
double |
95 |
+ |
c_fromSharpRGB(float cin[3], C_COLOR *cout) |
96 |
+ |
{ |
97 |
+ |
double xyz[3], sf; |
98 |
+ |
|
99 |
+ |
xyz[0] = XYZfromSharp[0][0]*cin[0] + XYZfromSharp[0][1]*cin[1] + |
100 |
+ |
XYZfromSharp[0][2]*cin[2]; |
101 |
+ |
xyz[1] = XYZfromSharp[1][0]*cin[0] + XYZfromSharp[1][1]*cin[1] + |
102 |
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XYZfromSharp[1][2]*cin[2]; |
103 |
+ |
xyz[2] = XYZfromSharp[2][0]*cin[0] + XYZfromSharp[2][1]*cin[1] + |
104 |
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XYZfromSharp[2][2]*cin[2]; |
105 |
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|
106 |
+ |
sf = 1./(xyz[0] + xyz[1] + xyz[2]); |
107 |
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|
108 |
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cout->cx = xyz[0] * sf; |
109 |
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cout->cy = xyz[1] * sf; |
110 |
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cout->flags = C_CDXY|C_CSXY; |
111 |
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|
112 |
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return(xyz[1]); |
113 |
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} |
114 |
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|
115 |
+ |
/* assign arbitrary spectrum */ |
116 |
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double |
117 |
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c_sset(C_COLOR *clr, double wlmin, double wlmax, const float spec[], int nwl) |
118 |
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{ |
119 |
+ |
double yval, scale; |
120 |
+ |
float va[C_CNSS]; |
121 |
+ |
int i, pos, n, imax, wl; |
122 |
+ |
double wl0, wlstep; |
123 |
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double boxpos, boxstep; |
124 |
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/* check arguments */ |
125 |
+ |
if ((nwl <= 1) | (spec == NULL) | (wlmin >= C_CMAXWL) | |
126 |
+ |
(wlmax <= C_CMINWL) | (wlmin >= wlmax)) |
127 |
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return(0.); |
128 |
+ |
wlstep = (wlmax - wlmin)/(nwl-1); |
129 |
+ |
while (wlmin < C_CMINWL) { |
130 |
+ |
wlmin += wlstep; |
131 |
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--nwl; ++spec; |
132 |
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} |
133 |
+ |
while (wlmax > C_CMAXWL) { |
134 |
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wlmax -= wlstep; |
135 |
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--nwl; |
136 |
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} |
137 |
+ |
imax = nwl; /* box filter if necessary */ |
138 |
+ |
boxpos = 0; |
139 |
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boxstep = 1; |
140 |
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if (wlstep < C_CWLI) { |
141 |
+ |
imax = (wlmax - wlmin)/C_CWLI + 1e-7; |
142 |
+ |
boxpos = (wlmin - C_CMINWL)/C_CWLI; |
143 |
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boxstep = wlstep/C_CWLI; |
144 |
+ |
wlstep = C_CWLI; |
145 |
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} |
146 |
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scale = 0.; /* get values and maximum */ |
147 |
+ |
yval = 0.; |
148 |
+ |
pos = 0; |
149 |
+ |
for (i = 0; i < imax; i++) { |
150 |
+ |
va[i] = 0.; n = 0; |
151 |
+ |
while (boxpos < i+.5 && pos < nwl) { |
152 |
+ |
va[i] += spec[pos++]; |
153 |
+ |
n++; |
154 |
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boxpos += boxstep; |
155 |
+ |
} |
156 |
+ |
if (n > 1) |
157 |
+ |
va[i] /= (double)n; |
158 |
+ |
if (va[i] > scale) |
159 |
+ |
scale = va[i]; |
160 |
+ |
else if (va[i] < -scale) |
161 |
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scale = -va[i]; |
162 |
+ |
yval += va[i] * c_y31.ssamp[i]; |
163 |
+ |
} |
164 |
+ |
if (scale <= 1e-7) |
165 |
+ |
return(0.); |
166 |
+ |
yval /= (double)c_y31.ssum; |
167 |
+ |
scale = C_CMAXV / scale; |
168 |
+ |
clr->ssum = 0; /* convert to our spacing */ |
169 |
+ |
wl0 = wlmin; |
170 |
+ |
pos = 0; |
171 |
+ |
for (i = 0, wl = C_CMINWL; i < C_CNSS; i++, wl += C_CWLI) |
172 |
+ |
if ((wl < wlmin) | (wl > wlmax)) |
173 |
+ |
clr->ssamp[i] = 0; |
174 |
+ |
else { |
175 |
+ |
while (wl0 + wlstep < wl+1e-7) { |
176 |
+ |
wl0 += wlstep; |
177 |
+ |
pos++; |
178 |
+ |
} |
179 |
+ |
if ((wl+1e-7 >= wl0) & (wl-1e-7 <= wl0)) |
180 |
+ |
clr->ssamp[i] = scale*va[pos] + .5; |
181 |
+ |
else /* interpolate if necessary */ |
182 |
+ |
clr->ssamp[i] = .5 + scale / wlstep * |
183 |
+ |
( va[pos]*(wl0+wlstep - wl) + |
184 |
+ |
va[pos+1]*(wl - wl0) ); |
185 |
+ |
clr->ssum += clr->ssamp[i]; |
186 |
+ |
} |
187 |
+ |
clr->flags = C_CDSPEC|C_CSSPEC; |
188 |
+ |
return(yval); |
189 |
+ |
} |
190 |
+ |
|
191 |
|
/* check if color is grey */ |
192 |
|
int |
193 |
|
c_isgrey(C_COLOR *clr) |
218 |
|
if (fl & C_CSXY) { /* cspec -> cxy */ |
219 |
|
x = y = z = 0.; |
220 |
|
for (i = 0; i < C_CNSS; i++) { |
221 |
< |
x += cie_xf.ssamp[i] * clr->ssamp[i]; |
222 |
< |
y += cie_yf.ssamp[i] * clr->ssamp[i]; |
223 |
< |
z += cie_zf.ssamp[i] * clr->ssamp[i]; |
221 |
> |
x += c_x31.ssamp[i] * clr->ssamp[i]; |
222 |
> |
y += c_y31.ssamp[i] * clr->ssamp[i]; |
223 |
> |
z += c_z31.ssamp[i] * clr->ssamp[i]; |
224 |
|
} |
225 |
< |
x /= (double)cie_xf.ssum; |
226 |
< |
y /= (double)cie_yf.ssum; |
227 |
< |
z /= (double)cie_zf.ssum; |
225 |
> |
x /= (double)c_x31.ssum; |
226 |
> |
y /= (double)c_y31.ssum; |
227 |
> |
z /= (double)c_z31.ssum; |
228 |
|
z += x + y; |
229 |
|
clr->cx = x / z; |
230 |
|
clr->cy = y / z; |
248 |
|
if (clr->flags & C_CSSPEC) { /* from spectrum */ |
249 |
|
y = 0.; |
250 |
|
for (i = 0; i < C_CNSS; i++) |
251 |
< |
y += cie_yf.ssamp[i] * clr->ssamp[i]; |
251 |
> |
y += c_y31.ssamp[i] * clr->ssamp[i]; |
252 |
|
clr->eff = C_CLPWM * y / clr->ssum; |
253 |
|
} else /* clr->flags & C_CSXY */ { /* from (x,y) */ |
254 |
< |
clr->eff = clr->cx*cie_xf.eff + clr->cy*cie_yf.eff + |
255 |
< |
(1. - clr->cx - clr->cy)*cie_zf.eff; |
254 |
> |
clr->eff = clr->cx*c_x31.eff + clr->cy*c_y31.eff + |
255 |
> |
(1. - clr->cx - clr->cy)*c_z31.eff; |
256 |
|
} |
257 |
|
clr->flags |= C_CSEFF; |
258 |
|
} |
259 |
|
} |
260 |
|
|
261 |
< |
/* mix two colors according to weights given -- cres can be c1 or c2 */ |
261 |
> |
/* mix two colors according to weights given -- cres may be c1 or c2 */ |
262 |
|
void |
263 |
|
c_cmix(C_COLOR *cres, double w1, C_COLOR *c1, double w2, C_COLOR *c2) |
264 |
|
{ |
265 |
|
double scale; |
135 |
– |
float cmix[C_CNSS]; |
266 |
|
int i; |
267 |
|
|
268 |
|
if ((c1->flags|c2->flags) & C_CDSPEC) { /* spectral mixing */ |
269 |
+ |
float cmix[C_CNSS]; |
270 |
+ |
|
271 |
|
c_ccvt(c1, C_CSSPEC|C_CSEFF); |
272 |
|
c_ccvt(c2, C_CSSPEC|C_CSEFF); |
273 |
|
w1 /= c1->eff*c1->ssum; |
277 |
|
cmix[i] = w1*c1->ssamp[i] + w2*c2->ssamp[i]; |
278 |
|
if (cmix[i] > scale) |
279 |
|
scale = cmix[i]; |
280 |
+ |
else if (cmix[i] < -scale) |
281 |
+ |
scale = -cmix[i]; |
282 |
|
} |
283 |
|
scale = C_CMAXV / scale; |
284 |
|
cres->ssum = 0; |
302 |
|
} |
303 |
|
} |
304 |
|
|
305 |
+ |
/* multiply two colors -- cres may be c1 or c2 */ |
306 |
+ |
double |
307 |
+ |
c_cmult(C_COLOR *cres, C_COLOR *c1, double y1, C_COLOR *c2, double y2) |
308 |
+ |
{ |
309 |
+ |
double yres; |
310 |
+ |
int i; |
311 |
+ |
|
312 |
+ |
if ((c1->flags|c2->flags) & C_CDSPEC) { |
313 |
+ |
long cmix[C_CNSS], cmax = 0; /* spectral multiply */ |
314 |
+ |
|
315 |
+ |
c_ccvt(c1, C_CSSPEC|C_CSEFF); |
316 |
+ |
c_ccvt(c2, C_CSSPEC|C_CSEFF); |
317 |
+ |
for (i = 0; i < C_CNSS; i++) { |
318 |
+ |
cmix[i] = c1->ssamp[i] * c2->ssamp[i]; |
319 |
+ |
if (cmix[i] > cmax) |
320 |
+ |
cmax = cmix[i]; |
321 |
+ |
else if (cmix[i] < -cmax) |
322 |
+ |
cmax = -cmix[i]; |
323 |
+ |
} |
324 |
+ |
cmax /= C_CMAXV; |
325 |
+ |
if (!cmax) { |
326 |
+ |
*cres = c_dfcolor; |
327 |
+ |
return(0.); |
328 |
+ |
} |
329 |
+ |
cres->ssum = 0; |
330 |
+ |
for (i = 0; i < C_CNSS; i++) |
331 |
+ |
cres->ssum += cres->ssamp[i] = cmix[i] / cmax; |
332 |
+ |
cres->flags = C_CDSPEC|C_CSSPEC; |
333 |
+ |
|
334 |
+ |
c_ccvt(cres, C_CSEFF); /* don't touch below */ |
335 |
+ |
yres = y1 * y2 * c_y31.ssum * C_CLPWM / |
336 |
+ |
(c1->eff*c1->ssum * c2->eff*c2->ssum) * |
337 |
+ |
cres->eff*( cres->ssum*(double)cmax + |
338 |
+ |
C_CNSS/2.0*(cmax-1) ); |
339 |
+ |
} else { |
340 |
+ |
float rgb1[3], rgb2[3]; /* CIE xy multiply */ |
341 |
+ |
|
342 |
+ |
c_toSharpRGB(c1, y1, rgb1); |
343 |
+ |
c_toSharpRGB(c2, y2, rgb2); |
344 |
+ |
|
345 |
+ |
rgb2[0] *= rgb1[0]; rgb2[1] *= rgb1[1]; rgb2[2] *= rgb1[2]; |
346 |
+ |
|
347 |
+ |
yres = c_fromSharpRGB(rgb2, cres); |
348 |
+ |
} |
349 |
+ |
return(yres); |
350 |
+ |
} |
351 |
+ |
|
352 |
|
#define C1 3.741832e-16 /* W-m^2 */ |
353 |
|
#define C2 1.4388e-2 /* m-K */ |
354 |
|
|
355 |
|
#define bbsp(l,t) (C1/((l)*(l)*(l)*(l)*(l)*(exp(C2/((t)*(l)))-1.))) |
356 |
< |
#define bblm(t) (C2/5./(t)) |
356 |
> |
#define bblm(t) (C2*0.2/(t)) |
357 |
|
|
358 |
|
/* set black body spectrum */ |
359 |
|
int |