diff --git a/src/backend_libtiff.c b/src/backend_libtiff.c
index 4a0f9cd..6d196b8 100644
--- a/src/backend_libtiff.c
+++ b/src/backend_libtiff.c
@@ -57,6 +57,22 @@ static void free_private(void *raw_private)
   free(private);
 }
 
+static uint8_t *convert_tiff_bitmap_to_rgba_inplace(
+    uint32_t *bitmap, size_t len)
+{
+  uint8_t *buf = (uint8_t *)bitmap;
+
+  for (size_t i = 0; i < len; i++) {
+    uint32_t tmp = bitmap[i];
+    buf[4 * i + 0] = TIFFGetR(tmp);
+    buf[4 * i + 1] = TIFFGetG(tmp);
+    buf[4 * i + 2] = TIFFGetB(tmp);
+    buf[4 * i + 3] = TIFFGetA(tmp);
+  }
+
+  return buf;
+}
+
 static void load_image(void *raw_private, struct imv_image **image, int *frametime)
 {
   *image = NULL;
@@ -81,7 +97,8 @@ static void load_image(void *raw_private, struct imv_image **image, int *frameti
   struct imv_bitmap *bmp = malloc(sizeof *bmp);
   bmp->width = private->width;
   bmp->height = private->height;
-  bmp->data = bitmap;
+  bmp->data = convert_tiff_bitmap_to_rgba_inplace(
+		  bitmap, imv_bitmap_size(bmp) / sizeof(uint32_t));
   *image = imv_image_create_from_bitmap(bmp);
 }
 
diff --git a/src/bitmap.c b/src/bitmap.c
index 9f84052..45483fb 100644
--- a/src/bitmap.c
+++ b/src/bitmap.c
@@ -1,7 +1,15 @@
 #include "bitmap.h"
 
+#include <assert.h>
+#include <stdint.h>
 #include <stdlib.h>
 
+size_t imv_bitmap_size(struct imv_bitmap* bmp)
+{
+  assert((size_t)bmp->width <= SIZE_MAX / bmp->height / BYTES_PER_CHANNEL);
+  return (size_t)bmp->width * bmp->height * BYTES_PER_CHANNEL;
+}
+
 void imv_bitmap_free(struct imv_bitmap *bmp)
 {
   free(bmp->data);
diff --git a/src/bitmap.h b/src/bitmap.h
index 87591d1..9d1dcca 100644
--- a/src/bitmap.h
+++ b/src/bitmap.h
@@ -1,12 +1,20 @@
 #ifndef IMV_BITMAP_H
 #define IMV_BITMAP_H
 
+#include <stdint.h>
+#include <stdlib.h>
+
+#define BYTES_PER_CHANNEL 4
+
 struct imv_bitmap {
   int width;
   int height;
   unsigned char *data;
 };
 
+/* Gets the size of the `data` buffer in bytes. */
+size_t imv_bitmap_size(struct imv_bitmap *bmp);
+
 /* Clean up a bitmap */
 void imv_bitmap_free(struct imv_bitmap *bmp);