Support / Print Preflight Visualizer (Local)

DTG/POD Print File Checker Lite (Local) helps you catch common print risks before you upload your file.

What this extension does

It visualizes typical DTG/POD risk areas, such as:

  • Thin strokes (may break / get lost)
  • Narrow gaps / knockouts (may fill in / merge)

Risk estimation is based on your image pixel dimensions and the print size (mm) you set.

Local-only (no uploads)

Images are processed locally in your browser. No files are uploaded or transmitted to any server.

For details, see the Privacy Policy.

Quick Start

1) Open the tool

  • Click the extension icon to open DTG/POD Print File Checker Lite (Local).

Tip: If the icon is not visible, open Chrome menu → Extensions → Pin.

2) Set print size (mm)

Choose a preset anchor or enter your print size in millimeters:

  • T-shirt 12×16
  • A4
  • Postcard
  • Custom

3) Load an image

Drag & drop an image (PNG recommended), or click to choose a file.

Supported formats:

  • PNG / JPEG / WebP

Notes:

  • Transparent PNG is recommended for clean detection.
  • If your image has a solid background, highlights may be harder to detect.

4) Choose analysis options

  • Standard / Stricter
    Stricter highlights more conservative risk zones.
  • Print: White garment / Dark garment
    Switch depending on your garment background.
  • Stress test: OFF | 150 | 200
    Simulates rougher conditions (downsample + upscale) to reveal weak points.

5) Analyze

Click Analyze to generate the right-side visualization.

6) Save results

Use the Save buttons to export:

  • Original image
  • Risk-highlight result

How to read results

  • Red: Thin strokes risk (may break / get lost)
  • Orange: Narrow gaps risk (may fill in / merge)

Important: This is a preflight helper, not a guarantee. When quality is critical, always do a test print.

FAQ

Does this tool upload my image?

No. It runs locally in your browser and does not transmit files.

Why does the background not change / look wrong?

Use Background: Light / Dark to adjust visibility.
If you use a transparent PNG, visibility depends on the preview matte.

The right pane is blank

This is expected until you click Analyze.

I see “0 hits” (no highlights), but I expected risks

Common causes:

  • The strokes/gaps are already thick enough at your chosen print size (mm).
  • Your image is not clean (e.g., noisy JPEG); try a cleaner export.
  • Detection may be affected when the image has a solid background. Try:
    • Using a transparent PNG
    • Increasing contrast (pure black ink on transparent or white)

The result is slow on large images

Large images may be slower to analyze.
Try a smaller PNG export if performance is an issue.

Troubleshooting

Installation error / “manifest.json” related errors

If you are installing from a ZIP for testing, ensure:

  • manifest.json is at the root of the ZIP (not inside a folder).

Permissions concerns

This extension should not require broad permissions for normal use.
If you see unexpected permission prompts, reinstall from the official Chrome Web Store listing after approval.

Contact / Support

Support email: contact@folktale.jp

Please include:

  • Chrome version
  • Extension version
  • A screenshot of the issue (if possible)
  • Steps to reproduce

Version

  • Current: 0.1.0 (Lite)