Document workflow · 8 min read
Start with a better capture
Every cleanup step is easier if the original capture is good, and no amount of editing fully rescues a bad one. Put the paper on a flat, uncluttered surface. Use diffuse daylight rather than a desk lamp, which creates a bright hotspot in the middle of the page. Hold the phone parallel to the paper instead of at an angle, because perspective distortion is hard to correct precisely and makes the text look uneven. Fill the frame with the page but leave a small margin so that no edge is cut off. If your phone has a document scanning mode, use it: those modes usually detect the page edges, correct perspective and apply a basic contrast boost automatically, which saves several manual steps. Take one extra frame as a backup in case the first is slightly blurred.
Crop to the page edge
The first editing step is a tight crop to the paper edge, removing the desk, the background and any fingers holding the page. Crop slightly inside the paper edge rather than outside it, so that a sliver of dark background does not remain along one side. If the page is rotated, straighten it before cropping, otherwise the crop will either include background at the corners or cut into the text. Most editors have a rotate control in small increments; use it until a line of text or the page border looks level against the edge of the canvas. For a form with a printed border, align the border with the canvas edge. For a page of plain text, use the baseline of a line of text as your reference, because that is what the eye reads as horizontal.
Correct the tone and remove the grey cast
Phone photos of white paper almost always come out grey, because the camera exposes for the whole scene rather than for the page. Raising brightness and contrast will bring the paper closer to white and make the text darker at the same time, which is exactly what you want. Increase brightness until the paper looks white rather than grey, then increase contrast until the text is crisp. Be careful not to push so far that thin strokes disappear or that the paper becomes a flat, blown-out white with no texture at all, because that can look artificial and can hide faint pencil marks. If the photo has a colour cast, from a warm indoor light for example, a slight cooling adjustment will neutralise it and make the page look properly white.
Convert to grayscale for text documents
If the document is text, a form, a receipt or a printed letter, converting it to grayscale often makes it look cleaner and reduces the file size at the same time. Colour in a text document is usually noise: a slight tint from the lighting, a coloured background, a stray highlight. Removing it makes the page look like a proper scan and makes the text easier to read. Keep the document in colour if it contains a photograph, a coloured stamp, a signature in blue or red ink, or a chart where colour carries meaning. A useful compromise for mixed documents is to keep the colour version as your archive copy and export a grayscale version for sending, so the recipient gets a clean, small file while you retain the full information.
Sharpen lightly, and know when to stop
A small amount of sharpening can make scanned text look crisper, especially if the original capture was slightly soft. The key word is small. Over-sharpening creates bright halos around letters, exaggerates paper texture and makes the document look worse, not better. Apply a modest amount, then zoom in on a paragraph at 100 percent and check the edges of the letters. If you can see a light outline around each stroke, you have gone too far; reduce the amount. If the original is genuinely blurry because the phone moved, sharpening will not fix it. In that case, retake the photo, because a sharp original is worth far more than any amount of post-processing.
Export for the destination
Think about where the document is going before you choose the format. For email or a messaging app, a JPG at a moderate quality is usually the most practical choice because it keeps the file small. For a portal that requires a PDF, convert the cleaned images to PDF in the correct page order. For a document with fine print or line art, PNG preserves sharp edges better than JPG, though the file will be larger. If the destination has a size limit, check the exported file against it before you upload, and compress a copy if necessary rather than re-exporting repeatedly. Name the files clearly, for example application-form-page-1.jpg, so that the recipient can tell what they are looking at and in what order.
A quick quality check
Before you send anything, open the exported file and read a full sentence from the middle of the page. If you can read it comfortably at normal size, the document is good enough. Check that all four corners of the page are present, that no text is cut off at the edges, and that the page is the right way up. If the document has multiple pages, confirm the order. Then check the file size and format against the destination's requirements. This last step takes thirty seconds and prevents the most common reason a document has to be re-sent, which is that it was readable on the sender's screen but not on the recipient's.
Do it now with a photoedit.in tool
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- Crop, straighten and clean up a scanned page
- Convert a colour scan to clean grayscale
- Turn the cleaned scan into a PDF
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