The digitized values look wrong

Recheck calibration reference positions, entered values, and whether either axis is logarithmic.

Automatic tracing follows the wrong line

Try a clearer source image or manual tracing where appropriate. Inspect the preview before accepting the trace.

Some points are inaccurate

Check steep turns, crossings, thick lines, and endpoints at higher zoom. Image-based digitization has inherent uncertainty.

The app struggles with a very large image

Very large images can require substantial memory. If the app becomes unstable, try a resized copy that still preserves curve details and axis labels.

I need a complete backup

CSV contains numerical data only. Keep the original image and use project sharing when you need to transfer project state; shared projects are accessible to people with the link.

Contact support

Use the support address listed on the website and include the app version, device/Android version, steps to reproduce the issue, and any error message.