diff --git a/transformations/src/main/java/jp/wasabeef/glide/transformations/BlurTransformation.java b/transformations/src/main/java/jp/wasabeef/glide/transformations/BlurTransformation.java
index 8e7cb1e..11d4a12 100644
--- a/transformations/src/main/java/jp/wasabeef/glide/transformations/BlurTransformation.java
+++ b/transformations/src/main/java/jp/wasabeef/glide/transformations/BlurTransformation.java
@@ -24,6 +24,8 @@ import com.bumptech.glide.load.resource.bitmap.BitmapResource;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Rect;
 import android.support.v8.renderscript.Allocation;
 import android.support.v8.renderscript.RenderScript;
 import android.support.v8.renderscript.ScriptIntrinsicBlur;
@@ -54,9 +56,11 @@ public class BlurTransformation implements Transformation<Bitmap> {
         int width = source.getWidth();
         int height = source.getHeight();
 
-        Bitmap bitmap = mBitmapPool.get(width, height, source.getConfig());
+        Bitmap.Config config =
+                source.getConfig() != null ? source.getConfig() : Bitmap.Config.ARGB_8888;
+        Bitmap bitmap = mBitmapPool.get(width, height, config);
         if (bitmap == null) {
-            bitmap = Bitmap.createBitmap(width, height, source.getConfig());
+            bitmap = Bitmap.createBitmap(width, height, config);
         }
 
         Canvas canvas = new Canvas(bitmap);
diff --git a/transformations/src/main/java/jp/wasabeef/glide/transformations/ColorFilterTransformation.java b/transformations/src/main/java/jp/wasabeef/glide/transformations/ColorFilterTransformation.java
index 216c135..3e8ae59 100644
--- a/transformations/src/main/java/jp/wasabeef/glide/transformations/ColorFilterTransformation.java
+++ b/transformations/src/main/java/jp/wasabeef/glide/transformations/ColorFilterTransformation.java
@@ -45,9 +45,11 @@ public class ColorFilterTransformation implements Transformation<Bitmap> {
         int width = source.getWidth();
         int height = source.getHeight();
 
-        Bitmap bitmap = mBitmapPool.get(width, height, source.getConfig());
+        Bitmap.Config config =
+                source.getConfig() != null ? source.getConfig() : Bitmap.Config.ARGB_8888;
+        Bitmap bitmap = mBitmapPool.get(width, height, config);
         if (bitmap == null) {
-            bitmap = Bitmap.createBitmap(width, height, source.getConfig());
+            bitmap = Bitmap.createBitmap(width, height, config);
         }
 
         Canvas canvas = new Canvas(bitmap);
diff --git a/transformations/src/main/java/jp/wasabeef/glide/transformations/CropCircleTransformation.java b/transformations/src/main/java/jp/wasabeef/glide/transformations/CropCircleTransformation.java
index 6cfdac7..c5c440d 100644
--- a/transformations/src/main/java/jp/wasabeef/glide/transformations/CropCircleTransformation.java
+++ b/transformations/src/main/java/jp/wasabeef/glide/transformations/CropCircleTransformation.java
@@ -43,9 +43,11 @@ public class CropCircleTransformation implements Transformation<Bitmap> {
         int width = (source.getWidth() - size) / 2;
         int height = (source.getHeight() - size) / 2;
 
-        Bitmap bitmap = mBitmapPool.get(size, size, source.getConfig());
+        Bitmap.Config config =
+                source.getConfig() != null ? source.getConfig() : Bitmap.Config.ARGB_8888;
+        Bitmap bitmap = mBitmapPool.get(size, size, config);
         if (bitmap == null) {
-            bitmap = Bitmap.createBitmap(size, size, source.getConfig());
+            bitmap = Bitmap.createBitmap(size, size, config);
         }
 
         Canvas canvas = new Canvas(bitmap);
diff --git a/transformations/src/main/java/jp/wasabeef/glide/transformations/CropSquareTransformation.java b/transformations/src/main/java/jp/wasabeef/glide/transformations/CropSquareTransformation.java
index 99be044..5c1c87f 100644
--- a/transformations/src/main/java/jp/wasabeef/glide/transformations/CropSquareTransformation.java
+++ b/transformations/src/main/java/jp/wasabeef/glide/transformations/CropSquareTransformation.java
@@ -41,7 +41,9 @@ public class CropSquareTransformation implements Transformation<Bitmap> {
         mWidth = (source.getWidth() - size) / 2;
         mHeight = (source.getHeight() - size) / 2;
 
-        Bitmap bitmap = mBitmapPool.get(mWidth, mHeight, source.getConfig());
+        Bitmap.Config config =
+                source.getConfig() != null ? source.getConfig() : Bitmap.Config.ARGB_8888;
+        Bitmap bitmap = mBitmapPool.get(mWidth, mHeight, config);
         if (bitmap == null) {
             bitmap = Bitmap.createBitmap(source, mWidth, mHeight, size, size);
         }
diff --git a/transformations/src/main/java/jp/wasabeef/glide/transformations/CropTransformation.java b/transformations/src/main/java/jp/wasabeef/glide/transformations/CropTransformation.java
index be0eeef..747e564 100644
--- a/transformations/src/main/java/jp/wasabeef/glide/transformations/CropTransformation.java
+++ b/transformations/src/main/java/jp/wasabeef/glide/transformations/CropTransformation.java
@@ -51,9 +51,11 @@ public class CropTransformation implements Transformation<Bitmap> {
             mHeight = source.getHeight();
         }
 
-        Bitmap bitmap = mBitmapPool.get(mWidth, mHeight, source.getConfig());
+        Bitmap.Config config =
+                source.getConfig() != null ? source.getConfig() : Bitmap.Config.ARGB_8888;
+        Bitmap bitmap = mBitmapPool.get(mWidth, mHeight, config);
         if (bitmap == null) {
-            bitmap = Bitmap.createBitmap(mWidth, mHeight, source.getConfig());
+            bitmap = Bitmap.createBitmap(mWidth, mHeight, config);
         }
 
         float scaleX = (float) mWidth / source.getWidth();
diff --git a/transformations/src/main/java/jp/wasabeef/glide/transformations/GrayscaleTransformation.java b/transformations/src/main/java/jp/wasabeef/glide/transformations/GrayscaleTransformation.java
index 2ec8958..d016bba 100644
--- a/transformations/src/main/java/jp/wasabeef/glide/transformations/GrayscaleTransformation.java
+++ b/transformations/src/main/java/jp/wasabeef/glide/transformations/GrayscaleTransformation.java
@@ -42,9 +42,11 @@ public class GrayscaleTransformation implements Transformation<Bitmap> {
         int width = source.getWidth();
         int height = source.getHeight();
 
-        Bitmap bitmap = mBitmapPool.get(width, height, source.getConfig());
+        Bitmap.Config config =
+                source.getConfig() != null ? source.getConfig() : Bitmap.Config.ARGB_8888;
+        Bitmap bitmap = mBitmapPool.get(width, height, config);
         if (bitmap == null) {
-            bitmap = Bitmap.createBitmap(width, height, source.getConfig());
+            bitmap = Bitmap.createBitmap(width, height, config);
         }
 
         Canvas canvas = new Canvas(bitmap);
diff --git a/transformations/src/main/java/jp/wasabeef/glide/transformations/RoundedCornersTransformation.java b/transformations/src/main/java/jp/wasabeef/glide/transformations/RoundedCornersTransformation.java
index a2948f7..58fd9fb 100644
--- a/transformations/src/main/java/jp/wasabeef/glide/transformations/RoundedCornersTransformation.java
+++ b/transformations/src/main/java/jp/wasabeef/glide/transformations/RoundedCornersTransformation.java
@@ -48,9 +48,11 @@ public class RoundedCornersTransformation implements Transformation<Bitmap> {
         int width = source.getWidth();
         int height = source.getHeight();
 
-        Bitmap bitmap = mBitmapPool.get(width, height, source.getConfig());
+        Bitmap.Config config =
+                source.getConfig() != null ? source.getConfig() : Bitmap.Config.ARGB_8888;
+        Bitmap bitmap = mBitmapPool.get(width, height, config);
         if (bitmap == null) {
-            bitmap = Bitmap.createBitmap(width, height, source.getConfig());
+            bitmap = Bitmap.createBitmap(width, height, config);
         }
 
         Canvas canvas = new Canvas(bitmap);