diff --git a/.travis.yml b/.travis.yml
index 16de7dc9e9..a2e2a8b072 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,7 +11,7 @@
 # environment variables so it is easier to explicitly specify the linux
 # jobs.
 os: osx
-osx_image: xcode13.2
+osx_image: xcode14.2
 
 language: cpp
 
@@ -31,7 +31,7 @@ env:
     - GIT_LFS_SKIP_SMUDGE: 1
     - PACKAGE: NO
     - REL_DESC_FILE: "$BUILD_DIR/rel_desc.md"
-    - VULKAN_SDK_VER: "1.2.176.1"
+    - VULKAN_SDK_VER: "1.3.243.0"
     # This is just to tell the Vulkan install script where to install.
     - VULKAN_INSTALL_DIR: "$HOME/VulkanSDK/$VULKAN_SDK_VER"
     - VULKAN_SDK: "$VULKAN_INSTALL_DIR/macOS"
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2b89547f46..ba01d431f0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -230,6 +230,7 @@ else()
 endif()
 
 set(KTX_MAIN_SRC
+    include/KHR/khr_df.h
     include/ktx.h
     lib/basis_sgd.h
     lib/basis_transcode.cpp
@@ -303,7 +304,11 @@ macro(commom_lib_settings lib write)
     endif()
 
     set_target_properties(${lib} PROPERTIES
-        PUBLIC_HEADER ${CMAKE_CURRENT_SOURCE_DIR}/include/ktx.h
+        PUBLIC_HEADER
+#          "${CMAKE_CURRENT_SOURCE_DIR}/include/ktx.h;${CMAKE_CURRENT_SOURCE_DIR}/include/KHR/khr_df.h"
+          # Omit khr_df.h. Its installation has to be handled separately to
+          # workaround CMake's failure to preserve the directory hierarchy.
+          "${CMAKE_CURRENT_SOURCE_DIR}/include/ktx.h"
         VERSION ${PROJECT_VERSION}
         SOVERSION ${PROJECT_VERSION_MAJOR}
         XCODE_ATTRIBUTE_ENABLE_HARDENED_RUNTIME "YES"
@@ -992,6 +997,22 @@ else()
     )
 endif()
 
+# Use of this to install KHR/khr_df.h is due to CMake's failure to
+# preserve the include source folder hierarchy.
+# See https://gitlab.kitware.com/cmake/cmake/-/issues/16739.
+if (IOS)
+    set_source_files_properties(
+          include/KHR/khr_df.h
+          PROPERTIES MACOSX_PACKAGE_LOCATION Headers/KHR
+    )
+else()
+    include(GNUInstallDirs)
+    install(FILES include/KHR/khr_df.h
+        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/KHR
+        COMPONENT dev
+    )
+endif()
+
 install(EXPORT KTXTargets
     FILE KtxTargets.cmake
     NAMESPACE KTX::
diff --git a/ci_scripts/build_macos.sh b/ci_scripts/build_macos.sh
index 95dd918079..24a5bcd93e 100755
--- a/ci_scripts/build_macos.sh
+++ b/ci_scripts/build_macos.sh
@@ -46,7 +46,7 @@ export PATH="${VULKAN_SDK}/bin:$PATH"
 # destination args can be expanded to a single word.
 OSX_XCODE_OPTIONS=(-alltargets -destination "platform=OS X,arch=x86_64")
 IOS_XCODE_OPTIONS=(-alltargets -destination "generic/platform=iOS" -destination "platform=iOS Simulator,OS=latest")
-XCODE_CODESIGN_ENV='CODE_SIGN_IDENTITY= CODE_SIGN_ENTITLEMENTS= CODE_SIGNING_REQUIRED=NO CODE_SIGNING_ALLOWED=NO'
+XCODE_NO_CODESIGN_ENV='CODE_SIGN_IDENTITY= CODE_SIGN_ENTITLEMENTS= CODE_SIGNING_REQUIRED=NO CODE_SIGNING_ALLOWED=NO'
 
 if which -s xcpretty ; then
   function handle_compiler_output() {
@@ -107,7 +107,7 @@ do
   if [ -n "$MACOS_CERTIFICATES_P12" -a "$config" = "Release" ]; then
     cmake --build . --config $config | handle_compiler_output
   else
-    cmake --build . --config $config -- CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO | handle_compiler_output
+    cmake --build . --config $config -- $XCODE_NO_CODESIGN_ENV | handle_compiler_output
   fi
 
   # Rosetta 2 should let x86_64 tests run on an Apple Silicon Mac hence the -o.
diff --git a/ci_scripts/install_linux.sh b/ci_scripts/install_linux.sh
index 252f443f76..0ac9a0ef51 100755
--- a/ci_scripts/install_linux.sh
+++ b/ci_scripts/install_linux.sh
@@ -32,7 +32,7 @@ if [ "$FEATURE_LOADTESTS" = "ON" ]; then
   os_codename=${os_codename#VERSION_CODENAME=}
 
   echo "Download Vulkan SDK"
-  wget -O - https://packages.lunarg.com/lunarg-signing-key-pub.asc | sudo apt-key add -
+  wget --no-verbose -O - https://packages.lunarg.com/lunarg-signing-key-pub.asc | sudo apt-key add -
   sudo wget -O /etc/apt/sources.list.d/lunarg-vulkan-$VULKAN_SDK_VER-$os_codename.list https://packages.lunarg.com/vulkan/$VULKAN_SDK_VER/lunarg-vulkan-$VULKAN_SDK_VER-$os_codename.list
   echo "Install Vulkan SDK"
   sudo apt update
diff --git a/ci_scripts/install_macos.sh b/ci_scripts/install_macos.sh
index 0d5f1e6622..ab5cfd457e 100755
--- a/ci_scripts/install_macos.sh
+++ b/ci_scripts/install_macos.sh
@@ -14,6 +14,7 @@ done
 
 FEATURE_LOADTESTS=${FEATURE_LOADTESTS:-ON}
 PLATFORM=${PLATFORM:-macOS}
+VULKAN_SDK_VER=${VULKAN_SDK_VER:-1.3.243.0}
 
 git lfs install
 git lfs version
@@ -30,10 +31,15 @@ if [ "$FEATURE_LOADTESTS" = "ON" ]; then
 
   # Current dir. is .../build/{KhronosGroup,msc-}/KTX-Software. cd to 'build'.
   pushd ../..
-  wget -O vulkansdk-macos-$VULKAN_SDK_VER.dmg https://sdk.lunarg.com/sdk/download/$VULKAN_SDK_VER/mac/vulkansdk-macos-$VULKAN_SDK_VER.dmg?Human=true
+  curl -s -S -o vulkansdk-macos-$VULKAN_SDK_VER.dmg https://sdk.lunarg.com/sdk/download/$VULKAN_SDK_VER/mac/vulkansdk-macos-$VULKAN_SDK_VER.dmg?Human=true
   hdiutil attach vulkansdk-macos-$VULKAN_SDK_VER.dmg
-  sudo /Volumes/vulkansdk-macos-$VULKAN_SDK_VER/InstallVulkan.app/Contents/macOS/InstallVulkan --root "$VULKAN_INSTALL_DIR" --accept-licenses --default-answer --confirm-command install
-  hdiutil detach /Volumes/vulkansdk-macos-$VULKAN_SDK_VER
+  sudo /Volumes/VulkanSDK/InstallVulkan.app/Contents/MacOS/InstallVulkan --root "$VULKAN_INSTALL_DIR" --accept-licenses --default-answer --confirm-command install
+  #hdiutil detach /Volumes/VulkanSDK
+  set +e
+  while hdiutil detach /Volumes/VulkanSDK; es=$?; [[ $ss -eq 16 ]]; do
+      lsof /Volumes/VulkanSDK
+      sleep 10
+  done
   rm vulkansdk-macos-$VULKAN_SDK_VER.dmg
   popd
 fi
diff --git a/other_include/KHR/khr_df.h b/include/KHR/khr_df.h
similarity index 100%
rename from other_include/KHR/khr_df.h
rename to include/KHR/khr_df.h
diff --git a/include/ktx.h b/include/ktx.h
index 60e94f01b5..0af87f2519 100644
--- a/include/ktx.h
+++ b/include/ktx.h
@@ -29,6 +29,8 @@
 #include <stdbool.h>
 #include <sys/types.h>
 
+#include <KHR/khr_df.h>
+
 /*
  * Don't use khrplatform.h in order not to break apps existing
  * before these definitions were needed.
@@ -1058,9 +1060,16 @@ ktxTexture2_GetComponentInfo(ktxTexture2* This, ktx_uint32_t* numComponents,
 KTX_API ktx_uint32_t KTX_APIENTRY
 ktxTexture2_GetNumComponents(ktxTexture2* This);
 
+KTX_API khr_df_transfer_e KTX_APIENTRY
+ktxTexture2_GetOETF_e(ktxTexture2* This);
+
+// For backward compatibility
 KTX_API ktx_uint32_t KTX_APIENTRY
 ktxTexture2_GetOETF(ktxTexture2* This);
 
+KTX_API khr_df_model_e KTX_APIENTRY
+ktxTexture2_GetColorModel_e(ktxTexture2* This);
+
 KTX_API ktx_bool_t KTX_APIENTRY
 ktxTexture2_GetPremultipliedAlpha(ktxTexture2* This);
 
diff --git a/lib/glloader.c b/lib/glloader.c
index 1aa92090e4..7d0845078a 100644
--- a/lib/glloader.c
+++ b/lib/glloader.c
@@ -925,8 +925,7 @@ ktxTexture1_GLUpload(ktxTexture1* This, GLuint* pTexture, GLenum* pTarget,
     formatInfo.glInternalformat = This->glInternalformat;
     formatInfo.glBaseInternalformat = This->glBaseInternalformat;
     formatInfo.glType = This->glType;
-    formatInfo.glFormat = This->glFormat;
-
+ 
     result = ktxTexture_GLUploadPrivate(ktxTexture(This), &formatInfo,
                                         pTexture, pTarget, pGlerror);
 
diff --git a/lib/mainpage.md b/lib/mainpage.md
index e1a660c50c..bc832f3aad 100644
--- a/lib/mainpage.md
+++ b/lib/mainpage.md
@@ -323,7 +323,16 @@ if (ktxTexture2_NeedsTranscoding(texture)) {
     // supported and pick a format. For example
     vk::PhysicalDeviceFeatures deviceFeatures;
     vkctx.gpu.getFeatures(&deviceFeatures);
-    if (deviceFeatures.textureCompressionETC2)
+    khr_df_model_e colorModel = ktxTexture2_GetColorModel_e(texture);
+    if (colorModel == KHR_DF_MODEL_UASTC
+        && deviceFeatures.textureCompressionASTC_LDR) {
+        tf = KTX_TTF_ASTC_4x4_RGBA;
+    } else if (colorModel == KHR_DF_MODEL_ETC1S
+               && deviceFeatures.textureCompressionETC2) {
+        tf = KTX_TTF_ETC;
+    } else if (deviceFeatures.textureCompressionASTC_LDR) {
+        tf = KTX_TTF_ASTC_4x4_RGBA;
+    } else if (deviceFeatures.textureCompressionETC2)
         tf = KTX_TTF_ETC2_RGBA;
     else if (deviceFeatures.textureCompressionBC)
         tf = KTX_TTF_BC3_RGBA;
diff --git a/lib/texture2.c b/lib/texture2.c
index 4364aa047e..afbe7dcbfe 100644
--- a/lib/texture2.c
+++ b/lib/texture2.c
@@ -1758,7 +1758,24 @@ ktxTexture2_GetImageOffset(ktxTexture2* This, ktx_uint32_t level,
  *
  * @param[in]     This      pointer to the ktxTexture2 object of interest.
  *
- * @return A KHR_DF enum value specifying the OETF.
+ * @return A @c khr_df_transfer enum value specifying the OETF.
+ */
+khr_df_transfer_e
+ktxTexture2_GetOETF_e(ktxTexture2* This)
+{
+    return KHR_DFDVAL(This->pDfd+1, TRANSFER);
+}
+
+/**
+ * @memberof ktxTexture2
+ * @~English
+ * @brief Retrieve the opto-electrical transfer function of the images.
+ * @deprecated Retained for backward compatibility. Use ktxTexture2\_GetOETF\_e()
+ *
+ * @param[in]     This      pointer to the ktxTexture2 object of interest.
+ *
+ * @return A @c khr_df_transfer enum value specifying the OETF, returned as
+ *         @c ktx_uint32_t.
  */
 ktx_uint32_t
 ktxTexture2_GetOETF(ktxTexture2* This)
@@ -1766,6 +1783,21 @@ ktxTexture2_GetOETF(ktxTexture2* This)
     return KHR_DFDVAL(This->pDfd+1, TRANSFER);
 }
 
+/**
+ * @memberof ktxTexture2
+ * @~English
+ * @brief Retrieve the DFD color model of the images.
+ *
+ * @param[in]     This      pointer to the ktxTexture2 object of interest.
+ *
+ * @return A @c khr_df_transfer enum value specifying the color model.
+ */
+khr_df_model_e
+ktxTexture2_GetColorModel_e(ktxTexture2* This)
+{
+    return KHR_DFDVAL(This->pDfd+1, MODEL);
+}
+
 /**
  * @memberof ktxTexture2
  * @~English
@@ -1773,7 +1805,7 @@ ktxTexture2_GetOETF(ktxTexture2* This)
  *
  * @param[in]     This      pointer to the ktxTexture2 object of interest.
  *
- * @return KTX_TRUE if the components are premultiplied, KTX_FALSE otherwise.
+ * @return KTX\_TRUE if the components are premultiplied, KTX_FALSE otherwise.
  */
 ktx_bool_t
 ktxTexture2_GetPremultipliedAlpha(ktxTexture2* This)
@@ -1784,14 +1816,14 @@ ktxTexture2_GetPremultipliedAlpha(ktxTexture2* This)
 /**
  * @memberof ktxTexture2
  * @~English
- * @brief Query if the texture is in a transcodable format.
+ * @brief Query if the images are in a transcodable format.
  *
  * @param[in]     This     pointer to the ktxTexture2 object of interest.
  */
 ktx_bool_t
 ktxTexture2_NeedsTranscoding(ktxTexture2* This)
 {
-    if (This->supercompressionScheme == KTX_SS_BASIS_LZ)
+    if (KHR_DFDVAL(This->pDfd + 1, MODEL) == KHR_DF_MODEL_ETC1S)
         return true;
     else if (KHR_DFDVAL(This->pDfd + 1, MODEL) == KHR_DF_MODEL_UASTC)
         return true;
diff --git a/tests/loadtests/CMakeLists.txt b/tests/loadtests/CMakeLists.txt
index 89d07c1cc0..632cff8d64 100644
--- a/tests/loadtests/CMakeLists.txt
+++ b/tests/loadtests/CMakeLists.txt
@@ -39,6 +39,7 @@ if(APPLE AND IOS)
     find_library(CoreMotion_LIBRARY CoreMotion)
     find_library(Foundation_LIBRARY Foundation)
     find_library(GameController_LIBRARY GameController)
+    find_library(IOSurface_LIBRARY IOSurface)
     find_library(Metal_LIBRARY Metal)
     find_library(OpenGLES_LIBRARY OpenGLES)
     find_library(QuartzCore_LIBRARY QuartzCore)
diff --git a/tests/loadtests/glloadtests/utils/GLTextureTranscoder.hpp b/tests/loadtests/glloadtests/utils/GLTextureTranscoder.hpp
index bc2ce341fa..5b54eaf474 100644
--- a/tests/loadtests/glloadtests/utils/GLTextureTranscoder.hpp
+++ b/tests/loadtests/glloadtests/utils/GLTextureTranscoder.hpp
@@ -28,19 +28,17 @@
 class TextureTranscoder {
   public:
     TextureTranscoder() {
-        compressedTexFeatures features;
-
-        determineCompressedTexFeatures(features);
-        if (features.astc_ldr)
-            tf = KTX_TTF_ASTC_4x4_RGBA;
-        else if (features.bc3)
-            tf = KTX_TTF_BC1_OR_3;
-        else if (features.etc2)
-            tf = KTX_TTF_ETC; // Let transcoder decide between RGB or RGBA
-        else if (features.pvrtc1)
-            tf = KTX_TTF_PVRTC1_4_RGBA;
-        else if (features.etc1)
-            tf = KTX_TTF_ETC1_RGB;
+        determineCompressedTexFeatures(deviceFeatures);
+        if (deviceFeatures.astc_ldr)
+            defaultTf = KTX_TTF_ASTC_4x4_RGBA;
+        else if (deviceFeatures.bc3)
+            defaultTf = KTX_TTF_BC1_OR_3;
+        else if (deviceFeatures.etc2)
+            defaultTf = KTX_TTF_ETC; // Let transcoder decide RGB or RGBA
+        else if (deviceFeatures.pvrtc1)
+            defaultTf = KTX_TTF_PVRTC1_4_RGBA;
+        else if (deviceFeatures.etc1)
+            defaultTf = KTX_TTF_ETC1_RGB;
         else {
             std::stringstream message;
 
@@ -52,8 +50,19 @@ class TextureTranscoder {
     void transcode(ktxTexture2* kTexture,
                    ktx_transcode_fmt_e otf = KTX_TTF_NOSELECTION) {
         KTX_error_code ktxresult;
-        if (otf != KTX_TTF_NOSELECTION)
+        ktx_transcode_fmt_e tf;
+        if (otf != KTX_TTF_NOSELECTION) {
             tf = otf;
+        } else {
+            khr_df_model_e colorModel = ktxTexture2_GetColorModel_e(kTexture);
+            if (colorModel == KHR_DF_MODEL_UASTC && deviceFeatures.astc_ldr) {
+                tf = KTX_TTF_ASTC_4x4_RGBA;
+            } else if (colorModel == KHR_DF_MODEL_ETC1S && deviceFeatures.etc2) {
+                tf = KTX_TTF_ETC;
+            } else {
+                tf = defaultTf;
+            }
+        }
         ktxresult = ktxTexture2_TranscodeBasis(kTexture, tf, 0);
         if (KTX_SUCCESS != ktxresult) {
             std::stringstream message;
@@ -65,11 +74,8 @@ class TextureTranscoder {
         }
     }
 
-    ktx_transcode_fmt_e getFormat() { return tf; }
-    
-
   protected:
-    ktx_transcode_fmt_e tf;
+    ktx_transcode_fmt_e defaultTf;
 
     struct compressedTexFeatures {
         bool astc_ldr;
@@ -83,7 +89,7 @@ class TextureTranscoder {
         bool pvrtc_srgb;
         bool pvrtc2;
         bool rgtc;
-    };
+    } deviceFeatures;
 
     void determineCompressedTexFeatures(compressedTexFeatures& features) {
         ktx_int32_t numCompressedFormats;
diff --git a/tests/loadtests/vkloadtests.cmake b/tests/loadtests/vkloadtests.cmake
index f2c75d41d2..57585cc7ef 100644
--- a/tests/loadtests/vkloadtests.cmake
+++ b/tests/loadtests/vkloadtests.cmake
@@ -201,6 +201,7 @@ if(APPLE)
             ${CoreHaptics_LIBRARY}
             ${Foundation_LIBRARY}
             ${GameController_LIBRARY}
+            ${IOSurface_LIBRARY}
             ${Metal_LIBRARY}
             ${MOLTENVK_FRAMEWORK}
             ${OpenGLES_LIBRARY}
diff --git a/tests/loadtests/vkloadtests/utils/VulkanTextureTranscoder.hpp b/tests/loadtests/vkloadtests/utils/VulkanTextureTranscoder.hpp
index 45e418634e..c535d2894a 100644
--- a/tests/loadtests/vkloadtests/utils/VulkanTextureTranscoder.hpp
+++ b/tests/loadtests/vkloadtests/utils/VulkanTextureTranscoder.hpp
@@ -16,17 +16,16 @@
 class TextureTranscoder {
   public:
     TextureTranscoder(VulkanContext& vkctx) {
-        vk::PhysicalDeviceFeatures deviceFeatures;
         vkctx.gpu.getFeatures(&deviceFeatures);
 
         if (deviceFeatures.textureCompressionASTC_LDR)
-            tf = KTX_TTF_ASTC_4x4_RGBA;
+            defaultTf = KTX_TTF_ASTC_4x4_RGBA;
         else if (deviceFeatures.textureCompressionETC2)
-            tf = KTX_TTF_ETC;
+            defaultTf = KTX_TTF_ETC;
         else if (deviceFeatures.textureCompressionBC)
-            tf = KTX_TTF_BC1_OR_3;
+            defaultTf = KTX_TTF_BC1_OR_3;
         else if (vkctx.enabledDeviceExtensions.pvrtc) {
-            tf = KTX_TTF_PVRTC2_4_RGBA;
+            defaultTf = KTX_TTF_PVRTC2_4_RGBA;
         } else {
             std::stringstream message;
 
@@ -37,6 +36,19 @@ class TextureTranscoder {
 
     void transcode(ktxTexture2* kTexture) {
         KTX_error_code ktxresult;
+        ktx_transcode_fmt_e tf;
+        khr_df_model_e colorModel = ktxTexture2_GetColorModel_e(kTexture);
+
+        if (colorModel == KHR_DF_MODEL_UASTC
+            && deviceFeatures.textureCompressionASTC_LDR) {
+            tf = KTX_TTF_ASTC_4x4_RGBA;
+        } else if (colorModel == KHR_DF_MODEL_ETC1S
+                   && deviceFeatures.textureCompressionETC2) {
+            tf = KTX_TTF_ETC;
+        } else {
+            tf = defaultTf;
+        }
+
         ktxresult = ktxTexture2_TranscodeBasis(kTexture, tf, 0);
         if (KTX_SUCCESS != ktxresult) {
             std::stringstream message;
@@ -48,9 +60,7 @@ class TextureTranscoder {
         }
     }
 
-    ktx_transcode_fmt_e getFormat() { return tf; }
-
   protected:
-    ktx_transcode_fmt_e tf;
-
+    ktx_transcode_fmt_e defaultTf;
+    vk::PhysicalDeviceFeatures deviceFeatures;
 };
diff --git a/utils/scapp.h b/utils/scapp.h
index 1f3af66d75..49ce8a8aff 100644
--- a/utils/scapp.h
+++ b/utils/scapp.h
@@ -1079,7 +1079,7 @@ scApp::encode(ktxTexture2* texture, const string& swizzle,
 {
     ktx_error_code_e result;
 
-    ktx_uint32_t oetf = ktxTexture2_GetOETF(texture);
+    khr_df_transfer_e oetf = ktxTexture2_GetOETF_e(texture);
     if (options.normalMode && oetf != KHR_DF_TRANSFER_LINEAR) {
         cerr << name << ": "
              << "--normal_mode specified but input file(s) are not "