Fix: fixed watermark not working on grayscale images.

CHANGELOG.md

@@ -1,6 +1,11 @@
 # Changelog
+## 1.1.x
 
-## 1.1.x: Migration (25.04.11)
+### 1.1.4: Bugfix watermark (25.09.29)
+- Added a check to ensure watermarks can be added to grayscale images.
+- Previously, attempting to add a watermark to a grayscale image would crash the program.
+
+### 1.1.1-3: Migration (25.04.11)
 - Migrated from GitLab to my forgejo instance for development.
 
 ---

src/optima35/image_handler.py

@@ -55,13 +55,21 @@ class ImageProcessor:
         x = imagewidth - textwidth - margin
         y = imageheight - textheight - margin
 
-        # thin border
-        drawer.text((x-1, y), text, font = font, fill = (64, 64, 64))
-        drawer.text((x+1, y), text, font = font, fill = (64, 64, 64))
-        drawer.text((x, y-1), text, font = font, fill = (64, 64, 64))
-        drawer.text((x, y+1), text, font = font, fill = (64, 64, 64))
-        # Adding text in the desired color
-        drawer.text((x, y), text, font = font, fill = (255, 255, 255))
+        # Pick colors based on mode, code from ChatGPT (the fix part).
+        if image.mode == "L":  # grayscale
+            border_color = 64       # dark gray border
+            text_color = 255        # white
+        else:  # RGB, RGBA, etc.
+            border_color = (64, 64, 64)
+            text_color = (255, 255, 255)
+
+        # Draw border (four directions)
+        drawer.text((x - 1, y), text, font=font, fill=border_color)
+        drawer.text((x + 1, y), text, font=font, fill=border_color)
+        drawer.text((x, y - 1), text, font=font, fill=border_color)
+        drawer.text((x, y + 1), text, font=font, fill=border_color)
+        # Draw main text
+        drawer.text((x, y), text, font=font, fill=text_color)
 
         return image