d65->d50 chromatic adaptation matrix (Bradford Method)
 1.047811 0.029542 -0.009235
 0.022887 0.990484 0.015044
 -0.050127 -0.017049 0.752132
cam = [ Bradford] c [ Bradford inverse]

sRGB (d65)
 0.412424 0.212656 0.019332
 0.357579 0.715158 0.119193
 0.180464 0.072186 0.950444
 = srgb_d65
 
adapted sRGB (d50)
 0.436040 0.222487 0.013931
 0.385068 0.716884 0.097105
 0.143102 0.060626 0.714279
 srgb_d50 = srgb_d65 [ cam ]
 
Adobe (D65)
 0.576700 0.297361 0.027033
 0.185556 0.627355 0.070688
 0.188212 0.075285 0.991248
 = adobe_d65

adapted Adobe (D50)
 0.609723 0.311107 0.019480
 0.205243 0.625662 0.060891
 0.149246 0.063228 0.744944
 adobe_d50 = adobe_d65 [ cam ]