diff --git a/config/default.py b/config/default.py
index de3b02d2d..5448c3589 100644
--- a/config/default.py
+++ b/config/default.py
@@ -38,9 +38,6 @@
 # Image processing
 PROCESSED_IMAGE_DIR = Path(FILES_PATH) / 'processed_images'
 RESIZED_IMAGES = Path(PROCESSED_IMAGE_DIR) / 'resized'
-IMAGE_SIZE = {
-    'thumbnail': '200',
-    'table': '100'}
 NONE_DISPLAY_EXT = ['.tiff', '.tif']
 ALLOWED_IMAGE_EXT = DISPLAY_FILE_EXTENSIONS + NONE_DISPLAY_EXT
 PROCESSED_EXT = '.jpeg'
diff --git a/install/3_data_web.sql b/install/3_data_web.sql
index f87b9e54c..adcba3125 100644
--- a/install/3_data_web.sql
+++ b/install/3_data_web.sql
@@ -26,6 +26,8 @@ INSERT INTO web.settings (name, value) VALUES
   ('file_upload_allowed_extension', 'gif jpeg jpg pdf png txt zip'),
   ('geonames_username', 'openatlas'),
   ('image_processing', 'True'),
+  ('image_size_table', '100'),
+  ('image_size_thumbnail', '200'),
   ('log_level', '6'),
   ('logo_file_id', ''),
   ('mail', ''),
diff --git a/install/upgrade/7.17.0.sql b/install/upgrade/7.17.0.sql
index a7a6ed57b..34ce0936d 100644
--- a/install/upgrade/7.17.0.sql
+++ b/install/upgrade/7.17.0.sql
@@ -9,4 +9,8 @@ UPDATE web.settings SET value = '7.17.0' WHERE name = 'database_version';
 -- #1442 API: CORS Settings in Backend UI
 INSERT INTO web.settings (name, value) VALUES ('api_core_allowance', '*');
 
+INSERT INTO web.settings (name, value) VALUES
+  ('image_size_table', '100'),
+  ('image_size_thumbnail', '200');
+
 END;
diff --git a/install/upgrade/upgrade.md b/install/upgrade/upgrade.md
index 2bd22facd..d4cc8964f 100644
--- a/install/upgrade/upgrade.md
+++ b/install/upgrade/upgrade.md
@@ -26,7 +26,9 @@ Following configuration parameters were moved from the .ini files to the
 database so that they can be adjusted via the backend. If you have changed the
 defaults you should adapt after the upgrade in the admin are.
 
-* api_core_allowance (default = '*', former "CORS_ALLOWANCE" in default.ini)
+* API: core allowance (default = '*', former CORS_ALLOWANCE in default.ini
+* Image: size table (default 100), size thumbnail (default 200),
+  former IMAGE_SIZE in default.ini
 
 ### 7.15.0 to 7.16.0
 7.16.0.sql is needed but will be taken care of by the database upgrade script.
diff --git a/openatlas/api/endpoints/content.py b/openatlas/api/endpoints/content.py
index 68d383f85..64012df78 100644
--- a/openatlas/api/endpoints/content.py
+++ b/openatlas/api/endpoints/content.py
@@ -21,7 +21,7 @@ def get() -> Union[tuple[Resource, int], Response]:
             'intro': get_translation('intro_for_frontend', lang),
             'contact': get_translation('contact_for_frontend', lang),
             'siteName': get_translation('site_name_for_frontend', lang),
-            'imageSizes': app.config['IMAGE_SIZE'],
+            'imageSizes': g.settings['image_size'],
             'legalNotice': get_translation('legal_notice_for_frontend', lang)}
         if parser['download']:
             download(content, content_template(), 'content')
diff --git a/openatlas/api/endpoints/display_image.py b/openatlas/api/endpoints/display_image.py
index 57dd85035..23ae27f98 100644
--- a/openatlas/api/endpoints/display_image.py
+++ b/openatlas/api/endpoints/display_image.py
@@ -1,9 +1,8 @@
 from pathlib import Path as Pathlib_path
 
-from flask import Response, send_file
+from flask import Response, send_file, g
 from flask_restful import Resource
 
-from openatlas import app
 from openatlas.api.resources.error import DisplayFileNotFoundError, \
     NoLicenseError
 from openatlas.api.resources.parser import image
@@ -21,7 +20,7 @@ def get(filename: str) -> Response:
         parser = image.parse_args()
         filepath = get_file_path(
             entity,
-            app.config['IMAGE_SIZE'][parser['image_size']]
+            g.settings['image_size'][parser['image_size']]
             if parser['image_size'] else None)
         if not filepath:
             raise DisplayFileNotFoundError
diff --git a/openatlas/api/resources/parser.py b/openatlas/api/resources/parser.py
index 16ea7d41e..3c507b1b6 100644
--- a/openatlas/api/resources/parser.py
+++ b/openatlas/api/resources/parser.py
@@ -1,3 +1,4 @@
+from flask import g
 from flask_restful import reqparse
 
 from openatlas import app
@@ -154,4 +155,4 @@
     type=str,
     help="{error_msg}",
     case_sensitive=False,
-    choices=list(size for size in app.config['IMAGE_SIZE']))
+    choices=list(size for size in g.settings['image_size']))
diff --git a/openatlas/display/image_processing.py b/openatlas/display/image_processing.py
index 8cea34e5b..89b64ad8d 100644
--- a/openatlas/display/image_processing.py
+++ b/openatlas/display/image_processing.py
@@ -13,7 +13,7 @@ def resize_image(filename: str) -> None:
 
 
 def loop_resize_image(name: str, file_format: str) -> None:
-    for size in app.config['IMAGE_SIZE'].values():
+    for size in g.settings['image_size'].values():
         safe_resize_image(name, file_format, size)
 
 
@@ -64,7 +64,7 @@ def check_processed_image(filename: str) -> bool:
 def loop_through_processed_folders(name: str, file_format: str) -> bool:
     ext = app.config['PROCESSED_EXT'] \
         if file_format in app.config['NONE_DISPLAY_EXT'] else file_format
-    for size in app.config['IMAGE_SIZE'].values():
+    for size in g.settings['image_size'].values():
         path = Path(app.config['RESIZED_IMAGES']) / size / f"{name}{ext}"
         if not path.is_file() \
                 and not safe_resize_image(name, file_format, size):
@@ -87,7 +87,7 @@ def create_folder(folder: Path) -> bool:  # pragma: no cover
 
 
 def delete_orphaned_resized_images() -> None:
-    for size in app.config['IMAGE_SIZE'].values():
+    for size in g.settings['image_size'].values():
         path = Path(app.config['RESIZED_IMAGES']) / size
         for file in path.glob('**/*'):
             file_name = file.name.rsplit('.', 1)[0].lower()
diff --git a/openatlas/display/util.py b/openatlas/display/util.py
index 7ab463d7c..c192e58ff 100644
--- a/openatlas/display/util.py
+++ b/openatlas/display/util.py
@@ -236,7 +236,7 @@ def profile_image(entity: Entity) -> str:
     if not path:
         return ''  # pragma: no cover
     resized = None
-    size = app.config['IMAGE_SIZE']['thumbnail']
+    size = g.settings['image_size']['thumbnail']
     if g.settings['image_processing'] and check_processed_image(path.name):
         if path_ := get_file_path(entity.image_id, size):
             resized = url_for('display_file', filename=path_.name, size=size)
@@ -245,7 +245,7 @@ def profile_image(entity: Entity) -> str:
     style = f'max-width:{g.settings["profile_image_width"]}px;'
     ext = app.config["DISPLAY_FILE_EXTENSIONS"]
     if resized:
-        style = f'max-width:{app.config["IMAGE_SIZE"]["thumbnail"]}px;'
+        style = f'max-width:{g.settings["image_size"]["thumbnail"]}px;'
         ext = app.config["ALLOWED_IMAGE_EXT"]
     if entity.class_.view == 'file':
         html = \
diff --git a/openatlas/views/entity_index.py b/openatlas/views/entity_index.py
index 842df7c9d..53908868d 100644
--- a/openatlas/views/entity_index.py
+++ b/openatlas/views/entity_index.py
@@ -78,16 +78,16 @@ def get_table(view: str) -> Table:
 
 
 def file_preview(entity_id: int) -> str:
-    size = app.config['IMAGE_SIZE']['table']
+    size = g.settings['image_size']['table']
     parameter = f"loading='lazy' alt='image' width='{size}'"
     if icon_path := get_file_path(
             entity_id,
-            app.config['IMAGE_SIZE']['table']):
+            g.settings['image_size']['table']):
         url = url_for('display_file', filename=icon_path.name, size=size)
         return f"<img src='{url}' {parameter}>"
     path = get_file_path(entity_id)
     if path and check_processed_image(path.name):
-        if icon := get_file_path(entity_id, app.config['IMAGE_SIZE']['table']):
+        if icon := get_file_path(entity_id, g.settings['image_size']['table']):
             url = url_for('display_file', filename=icon.name, size=size)
             return f"<img src='{url}' {parameter}>"
     return ''