Update gimp metrics and getters

desktop_env/evaluators/metrics/__init__.py

@@ -20,3 +20,11 @@ from .vlc import is_vlc_playing, is_vlc_recordings_folder, is_vlc_fullscreen, co
     compare_videos
 from .thunderbird import check_thunderbird_prefs, check_thunderbird_filter
 from .vscode import compare_text_file, compare_config, compare_answer, is_extension_installed, check_json_settings, check_json_keybindings
+from .gimp import (
+    check_brightness_decrease_and_structure_sim,
+    check_contrast_increase_and_structure_sim,
+    check_saturation_increase_and_structure_sim,
+    check_file_exists_and_structure_sim,
+    check_triangle_position,
+    check_structure_sim,
+)