補正前に文書をスキャンするベストプラクティス

What readers usually run into

• スマホの影
• 低い解像度
• 紙の丸まり
• 強い圧縮

Start with capture quality

Cleanup cannot fully compensate for cropped edges, severe blur, or missing text. Place the document flat, avoid strong side light, and keep the camera or scanner parallel to the page. For phone captures, use even lighting and check focus before saving.

Avoid preventable artifacts

Many cleanup problems come from shadows, curled paper, glossy reflections, low scan resolution, or heavy compression. Fixing those before upload is faster than trying to repair every page later.

Scan one test page

Before scanning a large packet, test one page and inspect small text, margins, signatures, and tables. If the test page looks gray or blurry, adjust lighting, resolution, or page position before continuing.

Use RedesignPDF where it helps most

After you have the best available scan, use RedesignPDF for pages that still have gray background, faded text, stains, or shadows. Do not use cleanup as a substitute for OCR, form filling, compression, or merging.

Phone scanning setup

If you use a phone, place the document on a flat surface with light coming from both sides or from a broad source above the page. Keep your hand and phone shadow away from the text. Hold the phone parallel to the page, tap to focus, and check the corners before saving. A few seconds spent on capture can remove several minutes of cleanup later.

Flatbed or office scanner setup

For a scanner, clean the glass, align the page, and avoid settings that create tiny compressed files at the cost of legibility. If the document has faint pencil or light type, preview one page and make sure those marks remain visible. If the scanner creates a gray background, you can still clean it later, but the best source file should retain as much real detail as possible.

After scanning, choose the right tool

Use RedesignPDF when the page image needs visual cleanup. Use OCR when you need searchable text. Use merge, split, or compression tools when the file structure or size is the problem. Separating those jobs prevents unrealistic prompts and gives better results. A clean scan is the starting point; the next tool depends on whether you need reading, search, editing, or file management.

A final pre-cleanup checklist

Before uploading, ask four questions: is the whole page visible, is the smallest text in focus, is the lighting even, and is the file not overly compressed? If the answer is no, fix the scan if possible. If the answer is yes but the page still has gray background, shadows, stains, or faded text, then visual cleanup is a sensible next step. This keeps RedesignPDF focused on the problems it is actually designed to solve.

Example prompt after a good scan

Once the capture is good, the prompt can stay simple: "Clean remaining scan artifacts, reduce gray background and shadows, improve text contrast, and preserve handwriting, stamps, tables, margins, and document structure." This prompt assumes the scan already contains the needed detail. It asks RedesignPDF to improve readability without turning cleanup into OCR, form filling, compression, or a general PDF utility workflow.

Related example to compare

Before scanning a large batch, compare your test page with a phone-scan or photocopy cleanup example. If your source has fewer shadows and sharper text than the example, cleanup should be straightforward. If it looks worse, improve the capture first instead of expecting post-processing to solve everything.

Step-by-step tutorial

1. スキャンPDFを開きます。
2. まず「補正前の文書スキャン」が最も目立つページを選びます。
3. 控えめな読みやすさ改善プロンプトを使います。
4. 処理前後を比較します。
5. 重要な文字、数字、日付、表を確認します。
6. 結果に問題がなければ書き出します。

Prompts you can paste

よくある失敗

• 白くしすぎて細い線や薄い印が消える。
• 視覚補正をOCRや文字変換と混同する。
• 数字、日付、表、手書きを確認せずに書き出す。

Related reading

スマホで撮ったスキャンPDFページを補正する コピーされたワークシートのスキャンをきれいにする