diff --git a/CMakeLists.txt b/CMakeLists.txt
index 92e099a..c07544d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -134,8 +134,12 @@ if(UNIX AND NOT APPLE)
         install(SCRIPT install.cmake)
     else()
         install(FILES space.nouspiro.tenmon.desktop DESTINATION "${CMAKE_INSTALL_DATADIR}/applications")
-        install(FILES resources/space.nouspiro.tenmon.png DESTINATION "${CMAKE_INSTALL_DATADIR}/icons/hicolor/64x64/apps")
+        install(FILES resources/space.nouspiro.tenmon_16.png DESTINATION "${CMAKE_INSTALL_DATADIR}/icons/hicolor/16x16/apps" RENAME space.nouspiro.tenmon.png)
+        install(FILES resources/space.nouspiro.tenmon_32.png DESTINATION "${CMAKE_INSTALL_DATADIR}/icons/hicolor/32x32/apps" RENAME space.nouspiro.tenmon.png)
+        install(FILES resources/space.nouspiro.tenmon_64.png DESTINATION "${CMAKE_INSTALL_DATADIR}/icons/hicolor/64x64/apps" RENAME space.nouspiro.tenmon.png)
         install(FILES resources/space.nouspiro.tenmon_128.png DESTINATION "${CMAKE_INSTALL_DATADIR}/icons/hicolor/128x128/apps" RENAME space.nouspiro.tenmon.png)
+        install(FILES resources/space.nouspiro.tenmon_256.png DESTINATION "${CMAKE_INSTALL_DATADIR}/icons/hicolor/256x256/apps" RENAME space.nouspiro.tenmon.png)
+        install(FILES resources/space.nouspiro.tenmon_512.png DESTINATION "${CMAKE_INSTALL_DATADIR}/icons/hicolor/512x512/apps" RENAME space.nouspiro.tenmon.png)
         install(FILES space.nouspiro.tenmon.xisf.xml DESTINATION "${CMAKE_INSTALL_DATADIR}/mime/packages")
     endif()
     install(FILES space.nouspiro.tenmon.metainfo.xml DESTINATION "${CMAKE_INSTALL_DATADIR}/metainfo")
diff --git a/about/tenmon b/about/tenmon
index 8d6baf2..49d5e01 100644
--- a/about/tenmon
+++ b/about/tenmon
@@ -1,5 +1,5 @@
 <table><tr>
-<td style="padding-right:10px"><img src=":/space.nouspiro.tenmon.png"></td>
+<td style="padding-right:10px"><img src=":/space.nouspiro.tenmon_64.png"></td>
 <td><h3>Tenmon</h3>
 Tenmon is FITS/XISF image viewer and converter. It also index FITS keywords.<br>
 v@GITVERSION@ Copyright © 2026 Dušan Poizl<br><br>
diff --git a/install.cmake b/install.cmake
index 3790378..c94584b 100644
--- a/install.cmake
+++ b/install.cmake
@@ -2,6 +2,10 @@ find_program(XDG-DESKTOP-MENU_EXECUTABLE xdg-desktop-menu)
 find_program(XDG-ICON-RESOURCE_EXECUTABLE xdg-icon-resource)
 find_program(XDG-MIME xdg-mime)
 execute_process(COMMAND ${XDG-DESKTOP-MENU_EXECUTABLE} install --novendor space.nouspiro.tenmon.desktop WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})
-execute_process(COMMAND ${XDG-ICON-RESOURCE_EXECUTABLE} install --novendor --size 64 resources/space.nouspiro.tenmon.png space.nouspiro.tenmon WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})
+execute_process(COMMAND ${XDG-ICON-RESOURCE_EXECUTABLE} install --novendor --size 16 resources/space.nouspiro.tenmon_16.png space.nouspiro.tenmon WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})
+execute_process(COMMAND ${XDG-ICON-RESOURCE_EXECUTABLE} install --novendor --size 32 resources/space.nouspiro.tenmon_32.png space.nouspiro.tenmon WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})
+execute_process(COMMAND ${XDG-ICON-RESOURCE_EXECUTABLE} install --novendor --size 64 resources/space.nouspiro.tenmon_64.png space.nouspiro.tenmon WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})
 execute_process(COMMAND ${XDG-ICON-RESOURCE_EXECUTABLE} install --novendor --size 128 resources/space.nouspiro.tenmon_128.png space.nouspiro.tenmon WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})
+execute_process(COMMAND ${XDG-ICON-RESOURCE_EXECUTABLE} install --novendor --size 256 resources/space.nouspiro.tenmon_256.png space.nouspiro.tenmon WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})
+execute_process(COMMAND ${XDG-ICON-RESOURCE_EXECUTABLE} install --novendor --size 512 resources/space.nouspiro.tenmon_512.png space.nouspiro.tenmon WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})
 execute_process(COMMAND ${XDG-MIME} install --novendor space.nouspiro.tenmon.xisf.xml WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})
diff --git a/resources/icon.ico b/resources/icon.ico
index 5cf9044..5049bcf 100644
Binary files a/resources/icon.ico and b/resources/icon.ico differ
diff --git a/resources/resources.qrc b/resources/resources.qrc
index 558e13e..51d1249 100644
--- a/resources/resources.qrc
+++ b/resources/resources.qrc
@@ -15,7 +15,7 @@
         <file>bggr.png</file>
         <file>grbg.png</file>
         <file>gbrg.png</file>
-        <file>space.nouspiro.tenmon.png</file>
+        <file>space.nouspiro.tenmon_64.png</file>
         <file>../translations/tenmon_pt_BR.qm</file>
         <file alias="help">../about/help_en</file>
         <file>colormap.png</file>
diff --git a/resources/space.nouspiro.tenmon.png b/resources/space.nouspiro.tenmon.png
deleted file mode 100644
index a7d12bd..0000000
Binary files a/resources/space.nouspiro.tenmon.png and /dev/null differ
diff --git a/resources/space.nouspiro.tenmon_128.png b/resources/space.nouspiro.tenmon_128.png
index 29c78c1..e6bb918 100644
Binary files a/resources/space.nouspiro.tenmon_128.png and b/resources/space.nouspiro.tenmon_128.png differ
diff --git a/resources/space.nouspiro.tenmon_16.png b/resources/space.nouspiro.tenmon_16.png
new file mode 100644
index 0000000..9782159
Binary files /dev/null and b/resources/space.nouspiro.tenmon_16.png differ
diff --git a/resources/space.nouspiro.tenmon_256.png b/resources/space.nouspiro.tenmon_256.png
new file mode 100644
index 0000000..274e434
Binary files /dev/null and b/resources/space.nouspiro.tenmon_256.png differ
diff --git a/resources/space.nouspiro.tenmon_32.png b/resources/space.nouspiro.tenmon_32.png
new file mode 100644
index 0000000..ddb56e6
Binary files /dev/null and b/resources/space.nouspiro.tenmon_32.png differ
diff --git a/resources/space.nouspiro.tenmon_512.png b/resources/space.nouspiro.tenmon_512.png
new file mode 100644
index 0000000..d151e68
Binary files /dev/null and b/resources/space.nouspiro.tenmon_512.png differ
diff --git a/resources/space.nouspiro.tenmon_64.png b/resources/space.nouspiro.tenmon_64.png
new file mode 100644
index 0000000..707d78e
Binary files /dev/null and b/resources/space.nouspiro.tenmon_64.png differ
diff --git a/resources/tenmon.icns b/resources/tenmon.icns
index f50cb0f..3c7546c 100644
Binary files a/resources/tenmon.icns and b/resources/tenmon.icns differ