diff --git a/src/core/colorspace.js b/src/core/colorspace.js
index b4f326d57c18d4..1904bb0ac03e39 100644
--- a/src/core/colorspace.js
+++ b/src/core/colorspace.js
@@ -1057,6 +1057,9 @@ const CalRGBCS = (function CalRGBCSClosure() {
     if (color <= 0.0031308) {
       return adjustToRange(0, 1, 12.92 * color);
     }
+    if (color >= 0.99554525) {
+      return 1;
+    }
     return adjustToRange(0, 1, (1 + 0.055) * color ** (1 / 2.4) - 0.055);
   }
 
@@ -1156,9 +1159,9 @@ const CalRGBCS = (function CalRGBCSClosure() {
     // A <---> AGR in the spec
     // B <---> BGG in the spec
     // C <---> CGB in the spec
-    const AGR = A ** cs.GR;
-    const BGG = B ** cs.GG;
-    const CGB = C ** cs.GB;
+    const AGR = A === 1 ? 1 : A ** cs.GR;
+    const BGG = B === 1 ? 1 : B ** cs.GG;
+    const CGB = C === 1 ? 1 : C ** cs.GB;
 
     // Computes intermediate variables L, M, N as per spec.
     // To decode X, Y, Z values map L, M, N directly to them.