The Lenticular Flip Print Interlacer slices two source images into alternating vertical micro-stripes matching physical lenticular lens sheet pitches (40, 50, or 60 LPI) for print fabrication.

### Lenticular Interlacing Geometry Lenticular prints place a sheet of microscopic parallel cylindrical lenses over an interlaced graphic. Depending on viewing angle, refracted light exposes only one of the interlaced images: - **Lens Pitch (Lines Per Inch - LPI)**: Standard hobbyist and commercial sheets come in 40 LPI (postcards/signs), 50 LPI (standard cards), and 60 LPI (fine detailed prints). - **Stripe Width Calculation**: At $300\text{ DPI}$ standard print resolution: $$\text{Stripe Width (px)} = \max\left(2, \left\lfloor \frac{300}{2 \times \text{LPI}} \right\rceil\right)$$ - For $50\text{ LPI}$: $(300 / 50) / 2 = 3\text{ pixels}$ per slice. - For $40\text{ LPI}$: $(300 / 40) / 2 \approx 4\text{ pixels}$ per slice. - For $60\text{ LPI}$: $(300 / 60) / 2 \approx 3\text{ pixels}$ per slice. - **Alternating Interlace Pattern**: Odd stripes sample image A, and even stripes sample image B across identical vertical dimensions. - **Interactive Flip Preview**: Simulates the angle tilt transition between image A and image B to verify optical alignment before printing.

### Worked Workflow Example 1. Upload two $1200 \times 900$ pixel photos: Image A (daytime cityscape) and Image B (night illuminated cityscape). 2. Select your lenticular lens sheet pitch: **$50\text{ LPI}$**. 3. The tool generates an interleaved canvas with alternating 3-pixel vertical slices from each source photo. 4. Test the **Flip Image A / Flip Image B** toggle to simulate the angular lenticular flip effect. 5. Click **Download Interlaced PNG** to export the ready-to-print file for optical adhesive mounting.

### In-Browser Canvas Interlacing Image slicing, column-by-column canvas rendering, and PNG generation execute 100% locally using HTML5 Canvas 2D APIs. No personal photographs, artwork, or print graphics are uploaded to any server.