diff --git a/README.md b/README.md
index 66191be..99f9b9d 100644
--- a/README.md
+++ b/README.md
@@ -402,7 +402,8 @@ When writing, it is also possible to specify a subtype:
   subsampling or loss of chromatic detail.
 - `YC`: converts RGB data into luminance (Y) and 2x2 subsampled chroma 
   (RY, BY), cutting raw color data by ~50% for significantly smaller file 
-  sizes.
+  sizes. **If the image does not have a height and width that are multiples 
+  of 2, `RGB` is used.**
 
 > [!note]
 > When writing grayscale images, the subtype makes no difference.
diff --git a/autotests/read/exr/alphatest_rgba.exr b/autotests/read/exr/alphatest_rgba.exr
new file mode 100644
index 0000000..58ecc4b
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diff --git a/autotests/read/exr/alphatest_rgba.tif b/autotests/read/exr/alphatest_rgba.tif
new file mode 100644
index 0000000..a434385
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diff --git a/autotests/write/format/exr/Format_A2BGR30_Premultiplied.exr b/autotests/write/format/exr/Format_A2BGR30_Premultiplied.exr
index 818b0d4..d755ff0 100644
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diff --git a/autotests/write/format/exr/Format_A2RGB30_Premultiplied.exr b/autotests/write/format/exr/Format_A2RGB30_Premultiplied.exr
index 818b0d4..d755ff0 100644
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diff --git a/autotests/write/format/exr/Format_ARGB32.exr b/autotests/write/format/exr/Format_ARGB32.exr
index eb67e3a..8d7436f 100644
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diff --git a/autotests/write/format/exr/Format_ARGB32_Premultiplied.exr b/autotests/write/format/exr/Format_ARGB32_Premultiplied.exr
index a7c1052..01ee863 100644
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diff --git a/autotests/write/format/exr/Format_ARGB4444_Premultiplied.exr b/autotests/write/format/exr/Format_ARGB4444_Premultiplied.exr
index 1bae48b..db536d2 100644
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diff --git a/autotests/write/format/exr/Format_ARGB6666_Premultiplied.exr b/autotests/write/format/exr/Format_ARGB6666_Premultiplied.exr
index f480e31..a6f7650 100644
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diff --git a/autotests/write/format/exr/Format_ARGB8555_Premultiplied.exr b/autotests/write/format/exr/Format_ARGB8555_Premultiplied.exr
index 97de062..f98e61b 100644
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diff --git a/autotests/write/format/exr/Format_ARGB8565_Premultiplied.exr b/autotests/write/format/exr/Format_ARGB8565_Premultiplied.exr
index 8d6a3d7..b091787 100644
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diff --git a/autotests/write/format/exr/Format_RGBA16FPx4.exr b/autotests/write/format/exr/Format_RGBA16FPx4.exr
index 39d7213..2f5db4e 100644
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diff --git a/autotests/write/format/exr/Format_RGBA16FPx4_Premultiplied.exr b/autotests/write/format/exr/Format_RGBA16FPx4_Premultiplied.exr
index d76ef76..9fe3d9a 100644
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diff --git a/autotests/write/format/exr/Format_RGBA32FPx4.exr b/autotests/write/format/exr/Format_RGBA32FPx4.exr
index c75c07f..2d09b69 100644
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diff --git a/autotests/write/format/exr/Format_RGBA32FPx4_Premultiplied.exr b/autotests/write/format/exr/Format_RGBA32FPx4_Premultiplied.exr
index 7e6e352..2d09b69 100644
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diff --git a/autotests/write/format/exr/Format_RGBA64.exr b/autotests/write/format/exr/Format_RGBA64.exr
index 1c89768..2d92ff6 100644
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diff --git a/autotests/write/format/exr/Format_RGBA64_Premultiplied.exr b/autotests/write/format/exr/Format_RGBA64_Premultiplied.exr
index 661592d..e36a799 100644
Binary files a/autotests/write/format/exr/Format_RGBA64_Premultiplied.exr and b/autotests/write/format/exr/Format_RGBA64_Premultiplied.exr differ
diff --git a/autotests/write/format/exr/Format_RGBA8888.exr b/autotests/write/format/exr/Format_RGBA8888.exr
index 5ba6004..9e5c469 100644
Binary files a/autotests/write/format/exr/Format_RGBA8888.exr and b/autotests/write/format/exr/Format_RGBA8888.exr differ
diff --git a/autotests/write/format/exr/Format_RGBA8888_Premultiplied.exr b/autotests/write/format/exr/Format_RGBA8888_Premultiplied.exr
index 4ed6669..1267019 100644
Binary files a/autotests/write/format/exr/Format_RGBA8888_Premultiplied.exr and b/autotests/write/format/exr/Format_RGBA8888_Premultiplied.exr differ
diff --git a/src/imageformats/exr.cpp b/src/imageformats/exr.cpp
index 7f723fc..8eccfd3 100644
--- a/src/imageformats/exr.cpp
+++ b/src/imageformats/exr.cpp
@@ -230,7 +230,7 @@ bool EXRHandler::canRead() const
 static QImage::Format imageFormat(const Imf::RgbaInputFile &file)
 {
     auto isRgba = file.channels() & Imf::RgbaChannels::WRITE_A;
-    return (isRgba ? QImage::Format_RGBA16FPx4 : QImage::Format_RGBX16FPx4);
+    return (isRgba ? QImage::Format_RGBA16FPx4_Premultiplied : QImage::Format_RGBX16FPx4);
 }
 
 /*!
@@ -519,9 +519,9 @@ bool makePreview(const QImage &image, Imf::Array2D<Imf::PreviewRgba> &pixels)
 
     QImage preview;
     if (w > h) {
-        preview = image.scaledToWidth(256).convertToFormat(QImage::Format_ARGB32);
+        preview = image.scaledToWidth(256).convertToFormat(QImage::Format_ARGB32_Premultiplied);
     } else {
-        preview = image.scaledToHeight(256).convertToFormat(QImage::Format_ARGB32);
+        preview = image.scaledToHeight(256).convertToFormat(QImage::Format_ARGB32_Premultiplied);
     }
     if (preview.isNull()) {
         return false;
@@ -693,7 +693,8 @@ bool EXRHandler::write(const QImage &image)
         // write the EXR
         K_OStream ostr(device());
         auto channelsType = image.hasAlphaChannel() ? Imf::RgbaChannels::WRITE_RGBA : Imf::RgbaChannels::WRITE_RGB;
-        if (m_subType == EXR_SUBFORMAT_YC) {
+        if (m_subType == EXR_SUBFORMAT_YC && !(width % 2) && !(height % 2)) {
+            // Works only with images with height and width that are multiples of 2.
             channelsType = channelsType == Imf::RgbaChannels::WRITE_RGBA ? Imf::RgbaChannels::WRITE_YCA : Imf::RgbaChannels::WRITE_YC;
         }
         if (image.format() == QImage::Format_Mono ||
@@ -707,7 +708,7 @@ bool EXRHandler::write(const QImage &image)
         pixels.resizeErase(EXR_LINES_PER_BLOCK, width);
 
         // convert the image and write into the stream
-        auto convFormat = image.hasAlphaChannel() ? QImage::Format_RGBA32FPx4 : QImage::Format_RGBX32FPx4;
+        auto convFormat = image.hasAlphaChannel() ? QImage::Format_RGBA32FPx4_Premultiplied : QImage::Format_RGBX32FPx4;
         ScanLineConverter slc(convFormat);
         slc.setDefaultSourceColorSpace(QColorSpace(QColorSpace::SRgb));
         slc.setTargetColorSpace(QColorSpace(QColorSpace::SRgbLinear));