Magnifier - Capture & Image Quality

How the Magnifier looks comes down to two settings: the capture method (how the screen region is grabbed) and the image quality mode (how that region is scaled up in the lens).

Capture Methods

The Magnifier captures a region of the screen to display in the zoom lens. FriskyMouse supports two capture methods, each with different trade-offs.

GDI+

The GDI+ method uses the standard Windows graphics API to capture the screen.

• Compatibility: Works on all supported Windows versions.
• Performance: Good for most use cases.
• Limitations: May not capture certain overlay content or hardware-accelerated surfaces.

Magnification API

The Magnification API method uses the built-in Windows magnification framework.

• Compatibility: Requires specific Windows capabilities.
• Performance: Can be faster and more accurate for certain content.
• Advantages: Better at capturing DPI-aware and scaled content.

Note

If you experience visual artifacts or missing content with one method, try switching to the other. GDI+ is the safer default.

Aspect	GDI+	Magnification API
Compatibility	Universal	Requires specific OS features
Performance	Good	Variable
DPI handling	Basic	Better
Default	Yes	No

Image Quality Modes

The Magnifier offers 5 image quality modes that control how the captured screen region is scaled up in the zoom lens. Each mode uses a different interpolation and post-processing technique.

Mode	Technique	Best For
Fast	Bilinear interpolation	Performance on slower systems
Standard	Bicubic interpolation	Balanced quality and performance
Enhanced (Sharp)	Bicubic interpolation with sharpening	Text, icons, and fine UI details
Smooth (Blur)	Bicubic with a box blur to reduce pixelation	High zoom levels where pixels show
Text Optimized	Combined blur and sharpening	Reading small text at high zoom

Choosing a Quality Mode

• Fast: minimizes CPU load; acceptable for casual use on older hardware.
• Standard: the default general-purpose option.
• Enhanced (Sharp): the default in FriskyMouse; produces the crispest result for text and UI controls.
• Smooth (Blur): reduces jagged edges when zooming past 4×.
• Text Optimized: use when reading paragraphs of small text during walkthroughs or presentations.

Sharpening Amount

When Enhanced (Sharp) is selected, the sharpening intensity is configurable (0–100). Higher values produce sharper output but can amplify noise. The default is 50.

Tip

For typical presentation work, leave the quality at Enhanced (Sharp) with sharpening at 50. Only lower the quality if you notice stuttering on an older machine or at very high refresh rates.

Performance Impact

Higher quality modes require more processing per captured frame. On modern hardware the difference is negligible, but on older CPUs or at high refresh rates (60 Hz capture), Fast mode can noticeably reduce lens lag.