diff --git a/poppler/GfxState.cc b/poppler/GfxState.cc
index ab796f7..dc41e66 100644
--- a/poppler/GfxState.cc
+++ b/poppler/GfxState.cc
@@ -2864,12 +2864,16 @@ void GfxSeparationColorSpace::getGray(GfxColor *color, GfxGray *gray) {
   GfxColor color2;
   int i;
 
-  x = colToDbl(color->c[0]);
-  func->transform(&x, c);
-  for (i = 0; i < alt->getNComps(); ++i) {
-    color2.c[i] = dblToCol(c[i]);
+  if (alt->getMode() == csDeviceGray && name->cmp("Black") == 0) {
+    *gray = clip01(gfxColorComp1 - color->c[0]);
+  } else {
+    x = colToDbl(color->c[0]);
+    func->transform(&x, c);
+    for (i = 0; i < alt->getNComps(); ++i) {
+      color2.c[i] = dblToCol(c[i]);
+    }
+    alt->getGray(&color2, gray);
   }
-  alt->getGray(&color2, gray);
 }
 
 void GfxSeparationColorSpace::getRGB(GfxColor *color, GfxRGB *rgb) {
@@ -2878,12 +2882,18 @@ void GfxSeparationColorSpace::getRGB(GfxColor *color, GfxRGB *rgb) {
   GfxColor color2;
   int i;
 
-  x = colToDbl(color->c[0]);
-  func->transform(&x, c);
-  for (i = 0; i < alt->getNComps(); ++i) {
-    color2.c[i] = dblToCol(c[i]);
+  if (alt->getMode() == csDeviceGray && name->cmp("Black") == 0) {
+    rgb->r = clip01(gfxColorComp1 - color->c[0]);
+    rgb->g = clip01(gfxColorComp1 - color->c[0]);
+    rgb->b = clip01(gfxColorComp1 - color->c[0]);
+  } else {
+    x = colToDbl(color->c[0]);
+    func->transform(&x, c);
+    for (i = 0; i < alt->getNComps(); ++i) {
+      color2.c[i] = dblToCol(c[i]);
+    }
+    alt->getRGB(&color2, rgb);
   }
-  alt->getRGB(&color2, rgb);
 }
 
 void GfxSeparationColorSpace::getCMYK(GfxColor *color, GfxCMYK *cmyk) {
@@ -2892,12 +2902,34 @@ void GfxSeparationColorSpace::getCMYK(GfxColor *color, GfxCMYK *cmyk) {
   GfxColor color2;
   int i;
 
-  x = colToDbl(color->c[0]);
-  func->transform(&x, c);
-  for (i = 0; i < alt->getNComps(); ++i) {
-    color2.c[i] = dblToCol(c[i]);
+  if (name->cmp("Black") == 0) {
+    cmyk->c = 0;
+    cmyk->m = 0;
+    cmyk->y = 0;
+    cmyk->k = color->c[0];
+  } else if (name->cmp("Cyan") == 0) {
+    cmyk->c = color->c[0];
+    cmyk->m = 0;
+    cmyk->y = 0;
+    cmyk->k = 0;
+  } else if (name->cmp("Magenta") == 0) {
+    cmyk->c = 0;
+    cmyk->m = color->c[0];
+    cmyk->y = 0;
+    cmyk->k = 0;
+  } else if (name->cmp("Yellow") == 0) {
+    cmyk->c = 0;
+    cmyk->m = 0;
+    cmyk->y = color->c[0];
+    cmyk->k = 0;
+  } else {
+    x = colToDbl(color->c[0]);
+    func->transform(&x, c);
+    for (i = 0; i < alt->getNComps(); ++i) {
+      color2.c[i] = dblToCol(c[i]);
+    }
+    alt->getCMYK(&color2, cmyk);
   }
-  alt->getCMYK(&color2, cmyk);
 }
 
 void GfxSeparationColorSpace::getDeviceN(GfxColor *color, GfxColor *deviceN) {