src/display/canvas.js

@@ -1323,7 +1323,8 @@ class CanvasGraphics {
           this.current.strokeAlpha = value;
           break;
         case "ca":
-          this.ctx.globalAlpha = this.current.fillAlpha = value;
+          this.current.fillAlpha = value;
+          this.ctx.globalAlpha = value;
           break;
         case "BM":
           this.ctx.globalCompositeOperation = value;
@@ -1377,12 +1378,17 @@ class CanvasGraphics {
       drawnHeight
     );
     this.suspendedCtx = this.ctx;
-    const ctx = (this.ctx = scratchCanvas.context);
+    this.ctx = scratchCanvas.context;
+    const ctx = this.ctx;
     ctx.setTransform(this.suspendedCtx.getTransform());
     copyCtxState(this.suspendedCtx, ctx);
     mirrorContextOperations(ctx, this.suspendedCtx);
 
-    this.setGState([["BM", "source-over"]]);
+    this.setGState([
+      ["BM", "source-over"],
+      ["ca", 1],
+      ["CA", 1],
+    ]);
   }
 
   endSMaskMode() {

test/test_manifest.json

@@ -5821,7 +5821,8 @@
     "file": "pdfs/issue16287.pdf",
     "md5": "cd3e0859140465ae8b8bde0c95cb4929",
     "rounds": 1,
-    "type": "eq"
+    "type": "eq",
+    "about": "Please note that this file currently renders incorrectly."
   },
   {
     "id": "issue2006",