Claude pyqt perf and chromaticity

clgui.py

@@ -1,15 +1,28 @@
-# -*- coding: utf-8 -*-
-"""
-Created on Mon Dec 28 12:24:04 2020
-
-@author: priscillababiak
-"""
-
-from PyQt5.QtWidgets import QApplication
-import sys
-from dataManager.loadfiles4CIE import RGBImage
-
-app = QApplication(sys.argv)
-RGBImageApp = RGBImage()
-
-sys.exit(app.exec_())
+# -*- coding: utf-8 -*-
+"""ColorLab entry point."""
+
+import os
+import sys
+
+# When frozen as a PyInstaller bundle, anchor the working directory to the
+# exe's folder so the calc layer's relative paths
+# ('dataManager/illuminants.csv', 'dataManager/white_point.csv') resolve and
+# generated images land in a writable spot next to the exe.
+if getattr(sys, "frozen", False):
+    os.chdir(os.path.dirname(sys.executable))
+
+from PyQt5.QtWidgets import QApplication
+
+from dataManager.loadfiles4CIE import RGBImage
+from ui.theme import apply_theme, app_font, load_mode
+
+app = QApplication(sys.argv)
+app.setApplicationName("ColorLab")
+app.setOrganizationName("ColorLab")
+app.setStyle("Fusion")
+app.setFont(app_font(10))
+apply_theme(app, load_mode())
+
+window = RGBImage()
+
+sys.exit(app.exec_())