Quick start
- Load a photo using 📷 Capture or 🖼️ Upload.
- Use Fit to centre the image, then pinch zoom to the border.
- If the card is skewed, use Perspective first. If it is just tilted, use Rotate.
- Go to Measure, place points for Left/Right and Top/Bottom, then your results appear.
Move and zoom
- One finger drag pans the image.
- Pinch to zoom in and out.
- The % chip in the top bar shows your current zoom level.
- Fit recentres and fits the image to the screen.
Rotate
- Tap and hold on the canvas to position the loupe, then press Set point.
- Place 2 points along an edge that should be perfectly straight (usually the outer border).
- Press Apply to straighten the image.
Perspective
This corrects keystone distortion (when the card looks like a trapezium).
- Place 8 points on the card edges in order: T1, T2, R1, R2, B1, B2, L1, L2.
- Try to pick points on the same border line for each edge.
- Press Apply when all 8 are set.
Measure
You will set 4 points per axis. Point 1 creates a guide line, and points 2 to 4 snap onto it.
- Left/Right order: L1 outer, L2 inner, R1 inner, R2 outer.
- Top/Bottom order: T1 outer, T2 inner, B1 inner, B2 outer.
- After you finish one axis, the tool automatically switches to the other.
- Use Undo for the last point or Clear to restart the current axis.
Results
Results show the centring ratio (for example 55/45) and the % breakdown. The grade lamps are
centering only checks, not a full grading prediction.
