Sometimes when diagrams or schematics look slightly off—lines that seem faded or contrast that feels strange—it’s tempting to immediately blame the software or the file itself. But often the culprit is much simpler: a screen that’s dusty, smudged, or reflecting light awkwardly. A quick wipe with a soft cloth and then a plain background check can make a world of difference in clarity. If you want a fast and easy way to spot lingering glare or brightness inconsistencies, try this tool to fill your display with a solid dark screen. It helps you see reflections, uneven lighting, and smudges that you might miss against a busy workspace, so you know whether it’s the content or the monitor that needs attention