fix: correct extra bits rgb test assertion based on write extra bits

image logic

tests/decode_images.rs

@@ -16,7 +16,8 @@ macro_rules! test_image_sum {
         fn $name(file: &str, expected_type: ColorType, expected_sum: $sum_ty) {
             let path = PathBuf::from(TEST_IMAGE_DIR).join(file);
             let img_file = File::open(path).expect("Cannot find test image!");
-            let mut decoder = Decoder::open(img_file).expect("Cannot create decoder");
+            let mut decoder =
+                Decoder::open_with_options(img_file, true).expect("Cannot create decoder");
 
             decoder.next_image().expect("Cannot read image IFD");
             assert_eq!(decoder.colortype().unwrap(), expected_type);
@@ -975,7 +976,7 @@ fn extra_bits_gray() {
 
 #[test]
 fn extra_bits_rgb() {
-    test_image_sum_u8("extra_bits_rgb_8b.tiff", ColorType::RGB(8), 0);
+    test_image_sum_u8("extra_bits_rgb_8b.tiff", ColorType::RGBA(8), 64);
 }
 
 #[test]