I would like to propose adding a new highlighting feature that allows users to select a specific region of a screenshot while automatically applying a grayout effect to the rest of the image. This would create a visual emphasis on the important part while maintaining context.

Key functionality:

• Select one region to highlight
• The non-highlighted area would be automatically converted to grayscale or dimmed
• Simple toggle on/off for the effect

Use Cases:

1. Creating educational materials where you need to draw attention to specific UI elements
2. Technical documentation where you want to emphasize a particular area
3. Bug reports where you need to highlight the problematic section

Benefits:

• Less intrusive than arrows or boxes
• Maintains the context of the full screenshot
• Improves clarity in technical communications
• Simple and straightforward to use

Would love to hear the community's thoughts on this feature.