diff --git a/libs/control.js b/libs/control.js
index a4a221bc..4b176d52 100644
--- a/libs/control.js
+++ b/libs/control.js
@@ -3511,9 +3511,7 @@ control.prototype._resize_canvas = function (obj) {
     } else {
         for (var name in core.dymCanvas) {
             var ctx = core.dymCanvas[name], canvas = ctx.canvas;
-            var ratio = canvas.hasAttribute('isHD') ? core.domStyle.ratio : 1;
-            canvas.style.width = canvas.width / ratio * core.domStyle.scale + "px";
-            canvas.style.height = canvas.height / ratio * core.domStyle.scale + "px";
+            core.resizeCanvas(ctx, parseFloat(canvas.getAttribute("_width")), parseFloat(canvas.getAttribute("_height")));
             canvas.style.left = parseFloat(canvas.getAttribute("_left")) * core.domStyle.scale + "px";
             canvas.style.top = parseFloat(canvas.getAttribute("_top")) * core.domStyle.scale + "px";
         }
diff --git a/libs/ui.js b/libs/ui.js
index 5ca53c49..1e178ef4 100644
--- a/libs/ui.js
+++ b/libs/ui.js
@@ -64,7 +64,13 @@ ui.prototype.clearMap = function (name, x, y, width, height) {
             if (x != null && y != null && width != null && height != null) {
                 ctx.clearRect(x, y, width, height);
             } else {
-                ctx.clearRect(-32, -32, ctx.canvas.width + 32, ctx.canvas.height + 32);
+                if (ctx.canvas.getAttribute('isHD')) {
+                    const width = ctx.canvas.width / core.domStyle.scale / devicePixelRatio;
+                    const height = ctx.canvas.height / core.domStyle.scale / devicePixelRatio;
+                    ctx.clearRect(0, 0, width, height);
+                } else {
+                    ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
+                }
             }
         }
     }
@@ -3446,6 +3452,8 @@ ui.prototype.createCanvas = function (name, x, y, width, height, z) {
     newCanvas.style.display = 'block';
     newCanvas.setAttribute("_left", x);
     newCanvas.setAttribute("_top", y);
+    newCanvas.setAttribute("_width", width);
+    newCanvas.setAttribute("_height", height);
     newCanvas.style.width = width * core.domStyle.scale + 'px';
     newCanvas.style.height = height * core.domStyle.scale + 'px';
     newCanvas.style.left = x * core.domStyle.scale + 'px';