diff --git a/CMakeLists.txt b/CMakeLists.txt
index 19ca2eb533..fbfd99e79a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required (VERSION 3.16.3) # Oldest Ubuntu LTS (20.04 currently)
 
-project(libheif LANGUAGES C CXX VERSION 1.17.3)
+project(libheif LANGUAGES C CXX VERSION 1.17.5)
 
 # compatibility_version is never allowed to be decreased for any specific SONAME.
 # Libtool in the libheif-1.15.1 release had set it to 17.0.0, so we have to use this for the v1.x.y versions.
diff --git a/README.md b/README.md
index b85bf7fa4a..faf4d9f387 100644
--- a/README.md
+++ b/README.md
@@ -155,7 +155,7 @@ For each codec, there are two configuration variables:
 * `WITH_{codec}_PLUGIN`: when enabled, the codec is compiled as a separate plugin.
 
 In order to use dynamic plugins, also make sure that `ENABLE_PLUGIN_LOADING` is enabled.
-The placeholder `{codec}` can have these values: `LIBDE265`, `X265`, `AOM_DECODER`, `AOM_ENCODER`, `SvtEnc`, `DAV1D`, `FFMPEG_HEVC_DECODER`, `JPEG_DECODER`, `JPEG_ENCODER`, `KVAZAAR`, `OpenJPEG_DECODER`, `OpenJPEG_ENCODER`.
+The placeholder `{codec}` can have these values: `LIBDE265`, `X265`, `AOM_DECODER`, `AOM_ENCODER`, `SvtEnc`, `DAV1D`, `FFMPEG_DECODER`, `JPEG_DECODER`, `JPEG_ENCODER`, `KVAZAAR`, `OpenJPEG_DECODER`, `OpenJPEG_ENCODER`.
 
 Further options are:
 
diff --git a/gnome/CMakeLists.txt b/gnome/CMakeLists.txt
index fc38555df5..c1768cf2ee 100644
--- a/gnome/CMakeLists.txt
+++ b/gnome/CMakeLists.txt
@@ -1 +1,3 @@
-install(FILES heif.thumbnailer DESTINATION ${CMAKE_INSTALL_DATADIR}/thumbnailers)
+if(TARGET heif-thumbnailer)
+  install(FILES heif.thumbnailer DESTINATION ${CMAKE_INSTALL_DATADIR}/thumbnailers)
+endif()
diff --git a/libheif/context.cc b/libheif/context.cc
index cea1cde2b6..446abe1ab8 100644
--- a/libheif/context.cc
+++ b/libheif/context.cc
@@ -2553,6 +2553,20 @@ Error HeifContext::encode_image_as_hevc(const std::shared_ptr<HeifPixelImage>& i
                  heif_suberror_Invalid_image_size);
   }
 
+  if (encoder->plugin->plugin_api_version >= 3 &&
+      encoder->plugin->query_encoded_size != nullptr) {
+    uint32_t check_encoded_width = input_width, check_encoded_height = input_height;
+
+    encoder->plugin->query_encoded_size(encoder->encoder,
+                                        input_width, input_height,
+                                        &check_encoded_width,
+                                        &check_encoded_height);
+
+    assert((int)check_encoded_width == encoded_width);
+    assert((int)check_encoded_height == encoded_height);
+  }
+
+
   // Note: 'ispe' must be before the transformation properties
   m_heif_file->add_ispe_property(image_id, encoded_width, encoded_height);
 
diff --git a/libheif/plugins/encoder_kvazaar.cc b/libheif/plugins/encoder_kvazaar.cc
index 81173ec640..bda1c001b7 100644
--- a/libheif/plugins/encoder_kvazaar.cc
+++ b/libheif/plugins/encoder_kvazaar.cc
@@ -22,10 +22,11 @@
 #include "libheif/heif_plugin.h"
 #include "encoder_kvazaar.h"
 #include <memory>
-#include <string>
+#include <string>   // apparently, this is a false positive of cpplint
 #include <cstring>
 #include <cassert>
 #include <vector>
+#include <algorithm>
 
 extern "C" {
 #include <kvazaar.h>
@@ -302,10 +303,22 @@ static void kvazaar_query_input_colorspace2(void* encoder_raw, heif_colorspace*
   }
   else {
     *colorspace = heif_colorspace_YCbCr;
-    //*chroma = encoder->chroma;
+    if (*chroma != heif_chroma_420 &&
+        *chroma != heif_chroma_422 &&
+        *chroma != heif_chroma_444) {
+      *chroma = heif_chroma_420;
+    }
   }
 }
 
+void kvazaar_query_encoded_size(void* encoder_raw, uint32_t input_width, uint32_t input_height,
+                                uint32_t* encoded_width, uint32_t* encoded_height)
+{
+  *encoded_width = (input_width + 7) & ~0x7;
+  *encoded_height = (input_height + 7) & ~0x7;
+}
+
+
 #if 0
 static int rounded_size(int s)
 {
@@ -335,10 +348,15 @@ static void append_chunk_data(kvz_data_chunk* data, std::vector<uint8_t>& out)
 }
 
 
-static void copy_plane(kvz_pixel* out_p, uint32_t out_stride, const uint8_t* in_p, uint32_t in_stride, int w, int h)
+static void copy_plane(kvz_pixel* out_p, uint32_t out_stride, const uint8_t* in_p, uint32_t in_stride, int w, int h, int padded_width, int padded_height)
 {
-  for (int y = 0; y < h; y++) {
-    memcpy(out_p + y * out_stride, in_p + y * in_stride, w);
+  for (int y = 0; y < padded_height; y++) {
+    int sy = std::min(y, h - 1); // source y
+    memcpy(out_p + y * out_stride, in_p + sy * in_stride, w);
+
+    if (padded_width > w) {
+      memset(out_p + y * out_stride + w, *(in_p + sy * in_stride + w - 1), padded_width - w);
+    }
   }
 }
 
@@ -427,6 +445,14 @@ static struct heif_error kvazaar_encode_image(void* encoder_raw, const struct he
   (void) ctu;
 #endif
 
+  int input_width = heif_image_get_width(image, heif_channel_Y);
+  int input_height = heif_image_get_height(image, heif_channel_Y);
+  int input_chroma_width = 0;
+  int input_chroma_height = 0;
+
+  uint32_t encoded_width, encoded_height;
+  kvazaar_query_encoded_size(encoder_raw, input_width, input_height, &encoded_width, &encoded_height);
+
   kvz_chroma_format kvzChroma;
   int chroma_stride_shift = 0;
   int chroma_height_shift = 0;
@@ -440,18 +466,24 @@ static struct heif_error kvazaar_encode_image(void* encoder_raw, const struct he
     kvzChroma = KVZ_CSP_420;
     chroma_stride_shift = 1;
     chroma_height_shift = 1;
+    input_chroma_width = (input_width + 1) / 2;
+    input_chroma_height = (input_height + 1) / 2;
   }
   else if (chroma == heif_chroma_422) {
     config->input_format = KVZ_FORMAT_P422;
     kvzChroma = KVZ_CSP_422;
     chroma_stride_shift = 1;
     chroma_height_shift = 0;
+    input_chroma_width = (input_width + 1) / 2;
+    input_chroma_height = input_height;
   }
   else if (chroma == heif_chroma_444) {
     config->input_format = KVZ_FORMAT_P444;
     kvzChroma = KVZ_CSP_444;
     chroma_stride_shift = 0;
     chroma_height_shift = 0;
+    input_chroma_width = input_width;
+    input_chroma_height = input_height;
   }
 
   if (chroma != heif_chroma_monochrome) {
@@ -468,7 +500,6 @@ static struct heif_error kvazaar_encode_image(void* encoder_raw, const struct he
     (void) h;
   }
 
-
   struct heif_color_profile_nclx* nclx = nullptr;
   heif_error err = heif_image_get_nclx_color_profile(image, &nclx);
   if (err.code != heif_error_Ok) {
@@ -496,8 +527,8 @@ static struct heif_error kvazaar_encode_image(void* encoder_raw, const struct he
   config->qp = ((100 - encoder->quality) * 51 + 50) / 100;
   config->lossless = encoder->lossless ? 1 : 0;
 
-  config->width = heif_image_get_width(image, heif_channel_Y);
-  config->height = heif_image_get_height(image, heif_channel_Y);
+  config->width = encoded_width;
+  config->height = encoded_height;
 
   // Note: it is ok to cast away the const, as the image content is not changed.
   // However, we have to guarantee that there are no plane pointers or stride values kept over calling the svt_encode_image() function.
@@ -510,7 +541,7 @@ static struct heif_error kvazaar_encode_image(void* encoder_raw, const struct he
   }
 */
 
-  kvz_picture* pic = api->picture_alloc_csp(kvzChroma, config->width, config->height);
+  kvz_picture* pic = api->picture_alloc_csp(kvzChroma, encoded_width, encoded_height);
   if (!pic) {
     api->config_destroy(config);
     return heif_error{
@@ -524,20 +555,22 @@ static struct heif_error kvazaar_encode_image(void* encoder_raw, const struct he
     int stride;
     const uint8_t* data = heif_image_get_plane_readonly(image, heif_channel_Y, &stride);
 
-    copy_plane(pic->y, pic->stride, data, stride, config->width, config->height);
+    copy_plane(pic->y, pic->stride, data, stride, input_width, input_height, encoded_width, encoded_height);
   }
   else {
     int stride;
     const uint8_t* data;
 
     data = heif_image_get_plane_readonly(image, heif_channel_Y, &stride);
-    copy_plane(pic->y, pic->stride, data, stride, config->width, config->height);
+    copy_plane(pic->y, pic->stride, data, stride, input_width, input_height, encoded_width, encoded_height);
 
     data = heif_image_get_plane_readonly(image, heif_channel_Cb, &stride);
-    copy_plane(pic->u, pic->stride >> chroma_stride_shift, data, stride, config->width >> chroma_stride_shift, config->height >> chroma_height_shift);
+    copy_plane(pic->u, pic->stride >> chroma_stride_shift, data, stride, input_chroma_width, input_chroma_height,
+               encoded_width >> chroma_stride_shift, encoded_height >> chroma_height_shift);
 
     data = heif_image_get_plane_readonly(image, heif_channel_Cr, &stride);
-    copy_plane(pic->v, pic->stride >> chroma_stride_shift, data, stride, config->width >> chroma_stride_shift, config->height >> chroma_height_shift);
+    copy_plane(pic->v, pic->stride >> chroma_stride_shift, data, stride, input_chroma_width, input_chroma_height,
+               encoded_width >> chroma_stride_shift, encoded_height >> chroma_height_shift);
   }
 
   kvz_encoder* kvzencoder = api->encoder_open(config);
@@ -671,7 +704,7 @@ static struct heif_error kvazaar_get_compressed_data(void* encoder_raw, uint8_t*
 
 static const struct heif_encoder_plugin encoder_plugin_kvazaar
     {
-        /* plugin_api_version */ 2,
+        /* plugin_api_version */ 3,
         /* compression_format */ heif_compression_HEVC,
         /* id_name */ "kvazaar",
         /* priority */ kvazaar_PLUGIN_PRIORITY,
@@ -698,7 +731,8 @@ static const struct heif_encoder_plugin encoder_plugin_kvazaar
         /* query_input_colorspace */ kvazaar_query_input_colorspace,
         /* encode_image */ kvazaar_encode_image,
         /* get_compressed_data */ kvazaar_get_compressed_data,
-        /* query_input_colorspace (v2) */ kvazaar_query_input_colorspace2
+        /* query_input_colorspace (v2) */ kvazaar_query_input_colorspace2,
+        /* query_encoded_size (v3) */ kvazaar_query_encoded_size
     };
 
 const struct heif_encoder_plugin* get_encoder_plugin_kvazaar()
diff --git a/libheif/uncompressed_image.cc b/libheif/uncompressed_image.cc
index cda5dc3dc2..c91e5dba4f 100644
--- a/libheif/uncompressed_image.cc
+++ b/libheif/uncompressed_image.cc
@@ -48,7 +48,8 @@ enum heif_uncompressed_component_type
   component_type_cyan = 13,
   component_type_magenta = 14,
   component_type_yellow = 15,
-  component_type_key_black = 16
+  component_type_key_black = 16,
+  component_type_max_valid = component_type_key_black
 };
 
 bool is_predefined_component_type(uint16_t type)
@@ -467,8 +468,10 @@ static Error get_heif_chroma_uncompressed(std::shared_ptr<Box_uncC>& uncC, std::
     uint16_t component_index = component.component_index;
     uint16_t component_type = cmpd->get_components()[component_index].component_type;
 
-    if (component_type >= 16) {
-      return { heif_error_Unsupported_feature, heif_suberror_Invalid_parameter_value, "a component_type >= 16 is not supported"};
+    if (component_type > component_type_max_valid) {
+      std::stringstream sstr;
+      sstr << "a component_type > " << component_type_max_valid << " is not supported";
+      return { heif_error_Unsupported_feature, heif_suberror_Invalid_parameter_value, sstr.str()};
     }
 
     componentSet |= (1 << component_type);