Conversion of bmp images to png fails during GLB export in Blender 3.3 Beta

Describe the bug Conversion of bmp images to png fails during GLB export in Blender 3.3 Beta. Using Blender 3.2.2 or previous versions is successful.

To Reproduce Steps to reproduce the behavior:

1. Create a bitmap image (*.bmp) with Windows Paint App.
2. Open Blender 3.3 Beta
3. Add a ‘Plane’ mesh
4. Add new “Principled BSDF” material to the mesh.
5. Change it’s “Emission” to a Image Texture. Attach the bitmap image.
6. Export GLB.
7. See error

or

1. Extract bug-report-20220807.zip
2. Open the extracted .blend file with Blender 3.3 Beta.
3. Export GLB.
4. See error

Read prefs: C:\Users\saturday06\AppData\Roaming\Blender Foundation\Blender\3.3\config\userpref.blend
Read blend: C:\Users\saturday06\Desktop\bug-report-20220807\bug-report-20220807\bug-report-20220807.blend
11:54:33 | INFO: Draco mesh compression is available, use library at C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\python\lib\site-packages\extern_draco.dll
11:54:37 | INFO: Starting glTF 2.0 export
11:54:37 | INFO: Extracting primitive: Plane
11:54:37 | INFO: Primitives created: 1
Traceback (most recent call last):
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\__init__.py", line 648, in execute
    return gltf2_blender_export.save(context, export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_export.py", line 35, in save
    json, buffer = __export(export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_export.py", line 52, in __export
    __gather_gltf(exporter, export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_export.py", line 66, in __gather_gltf
    active_scene_idx, scenes, animations = gltf2_blender_gather.gather_gltf2(export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather.py", line 30, in gather_gltf2
    scenes.append(__gather_scene(blender_scene, export_settings))
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_cache.py", line 38, in wrapper_cached
    result = func(*args, **kwargs)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather.py", line 69, in __gather_scene
    node = gltf2_blender_gather_nodes.gather_node(
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_nodes.py", line 35, in gather_node
    mesh=__gather_mesh(vnode, blender_object, export_settings),
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_nodes.py", line 246, in __gather_mesh
    result = gltf2_blender_gather_mesh.gather_mesh(blender_mesh,
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_cache.py", line 38, in wrapper_cached
    result = func(*args, **kwargs)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_mesh.py", line 61, in gather_mesh
    primitives=__gather_primitives(blender_mesh, uuid_for_skined_data, vertex_groups, modifiers, materials, export_settings),
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_mesh.py", line 147, in __gather_primitives
    return gltf2_blender_gather_primitives.gather_primitives(blender_mesh,
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_cache.py", line 38, in wrapper_cached
    result = func(*args, **kwargs)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_primitives.py", line 83, in gather_primitives
    material = gltf2_blender_gather_materials.gather_material(
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_cache.py", line 38, in wrapper_cached
    result = func(*args, **kwargs)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_materials.py", line 56, in gather_material
    emissive_texture, uvmap_actives_emissive_texture = __gather_emissive_texture(blender_material, export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_materials.py", line 215, in __gather_emissive_texture
    return export_emission_texture(blender_material, export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_materials_emission.py", line 54, in export_emission_texture
    emissive_texture, use_actives_uvmap_emissive, _ = gltf2_blender_gather_texture_info.gather_texture_info(emissive, (emissive,), export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_texture_info.py", line 23, in gather_texture_info
    return __gather_texture_info_helper(primary_socket, blender_shader_sockets, 'DEFAULT', filter_type, export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_cache.py", line 38, in wrapper_cached
    result = func(*args, **kwargs)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_texture_info.py", line 44, in __gather_texture_info_helper
    index, factor = __gather_index(blender_shader_sockets, export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_texture_info.py", line 141, in __gather_index
    return gltf2_blender_gather_texture.gather_texture(blender_shader_sockets, export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_cache.py", line 38, in wrapper_cached
    result = func(*args, **kwargs)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_texture.py", line 31, in gather_texture
    source, factor = __gather_source(blender_shader_sockets, export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_texture.py", line 83, in __gather_source
    return gltf2_blender_gather_image.gather_image(blender_shader_sockets, export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_cache.py", line 38, in wrapper_cached
    result = func(*args, **kwargs)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_image.py", line 46, in gather_image
    buffer_view, factor_buffer_view = __gather_buffer_view(image_data, mime_type, name, export_settings)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_cache.py", line 38, in wrapper_cached
    result = func(*args, **kwargs)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_gather_image.py", line 106, in __gather_buffer_view
    data, factor = image_data.encode(mime_type)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_image.py", line 136, in encode
    return self.__encode_happy(), None
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_image.py", line 146, in __encode_happy
    return self.__encode_from_image(self.blender_image())
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_image.py", line 228, in __encode_from_image
    return _encode_temp_image(tmp_image, self.file_format)
  File "C:\Users\saturday06\Desktop\blender-3.3.0-beta\3.3\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_image.py", line 240, in _encode_temp_image
    with open(tmpfilename, "rb") as f:
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\SATURD~1\\AppData\\Local\\Temp\\tmprau94mjh/img'

Expected behavior

No error.

Screenshots

https://user-images.githubusercontent.com/532872/183290636-eee21707-4818-47ac-ae7e-e619feabb881.mp4

.blend file/ .gltf

bug-report-20220807.zip

Version

• OS: Windows 11, macOS Monterey
• Broken: version: 3.3.0 Beta, branch: master, commit date: 2022-08-05 17:53, hash: rB74f983738ab4
• Worked: 3.2.2, 2.83.20

[julienduroure]

Seems upstream bug is now fixed. Let’s wait tomorrow’s build to test and close this ticket

[julienduroure]

Ok, seems the issue comes from Blender API, not from the addon. I opened the issue on Blender tracker: https://developer.blender.org/T100281