How to Use WSQViewer — View, Zoom & Convert WSQ Files

How to Use WSQViewer — View, Zoom & Convert WSQ Files

Overview

WSQViewer is a lightweight utility for opening and inspecting WSQ (Wavelet Scalar Quantization) fingerprint image files. This guide covers installing, opening WSQ files, basic navigation (zoom, pan), and converting WSQ to common image formats.

1. Install

• Download the appropriate WSQViewer build for your OS (Windows, macOS, Linux).
• On Windows: run the installer or unzip and place the executable in a folder.
• On macOS/Linux: unpack the archive and make the binary executable (chmod +x wsqviewer).

2. Open a WSQ file

• Launch WSQViewer.
• Use File → Open (or drag-and-drop) to load a .wsq file.
• The viewer will display image metadata (dimensions, DPI, bit depth) if available.

3. View controls

• Zoom in/out: mouse wheel or toolbar buttons.
• Fit to window: double-click or use the fit button.
• Actual size: view at 100% to check pixel-level detail.
• Pan: click-and-drag or hold spacebar while dragging.

4. Image adjustments

• Brightness/Contrast: use sliders in the Adjust menu (if provided).
• Rotate/Flip: rotate 90° or flip horizontally/vertically to correct orientation.
• Grid/Overlay: enable a pixel grid or measurement overlay for inspection.

5. Convert WSQ to other formats

• File → Export/Save As.
• Choose format: PNG or TIFF recommended for lossless output; JPEG for smaller size (may introduce compression artifacts).
• For forensic use, export as lossless TIFF or PNG and preserve metadata where possible.
• Set DPI and bit depth in export options to match original image.

6. Batch conversion (if supported)

• Use File → Batch Convert or run CLI:

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  wsqviewer –batch –input-dir ./wsq_files –output-dir ./png_files –format png 

  (Adjust flags per the app’s documentation.)

7. Troubleshooting

• Cannot open file: ensure file is a valid WSQ and not corrupted.
• Strange artifacts after conversion: export as PNG/TIFF with original bit depth to avoid compression loss.
• Missing metadata: some WSQ files omit DPI or subject info; use external tools to inspect headers if needed.

8. Tips

• For forensic accuracy, never convert to lossy JPEG for archival purposes.
• Keep originals unchanged; work on copies for edits or conversions.
• Use actual-size view to inspect ridge detail in fingerprints.

If you want,