Scanning

Learning goal

You will be able to turn a developed negative into a digital file and make it ready to edit and share. You will compare scanning with a flatbed scanner and photographing the negative with a camera and a light source through speed, detail, cost and setup. You will keep the negative flat and clean with a negative holder, invert the reversed-tone image, and neutralize the orange mask of color negative before inverting. You will reduce dust and scratches before scanning and clean the rest up in editing, and edit the whole roll not with a single automatic setting but by reading each frame by its own light. You will check during inversion that skin colors don't shift and that the shadows of dark-skinned faces don't close up. In the assignment you will also do, from start to finish, the work that closes the module, stretching from shooting a roll to sharing it.

The question

Your friend takes the dried negative strips out of their sleeves. When they hold them up to the light they recognize the frames, but everything is reversed: the faces of the men playing backgammon are light, the shaded table bright, the sky dark. In the corner of the club there is a scanner with a lit lid, gathering dust. The older member, on the other hand, puts a light box, a tripod and a camera fitted with a macro lens on the table: "I photograph my negatives," they say.

Your friend wants to try both ways but doesn't know where to start. Why is the scanner slow, why is the camera so fast? How will the reversed tones be fixed, and where does the orange tone on a color roll come from? How does a negative become digital?

Context

In the tone curve lesson you learned to set with a line which tone each tone of the photo will turn into after editing (Lesson 21.1). In the cleanup lesson, too, you saw how sensor dust and small spots are removed in editing (Lesson 21.5). In the previous lesson you developed and dried the film and placed the negatives in sleeves as strips (Lesson 27.4).

The film module's last step brings two worlds together. Film carries the slowness of shooting and development; scanning turns that negative into a file that can be edited, shared and printed. This hybrid way of working is the everyday path of many photographers who work with film today. The module ends with a roll being shot and developed, scanned and its best three frames shared; this work is described step by step in the assignment below.

Simple explanation

By what paths is a negative transferred to digital?

A flatbed scanner is a scanner that reads the negative line by line by placing it on the glass or in a holder and passing light through it from below or above. Those suitable for scanning film have an extra light source inside the lid. Setup is easy and it can scan a few strips at once; but scanning is slow and detail can stay limited, especially in small frames.

Camera scanning is photographing the negative frame by frame with a camera fitted with a macro lens, after placing it on a light source that is even and gives correct colors. The camera is placed on a tripod or a stand so that it is exactly parallel to the negative; if it isn't parallel, one edge of the frame stays sharp and the opposite edge blurred. A frame is shot in a second, the file can be saved in raw format, and detail mostly depends on the camera's resolution. Its setup, however, calls for more parts and more adjustments; excess light around the light source can also lower the frame's contrast if it isn't masked.

A negative holder is a frame with a window, usually the size of one frame or one strip, that keeps the film flat, free of dust and steady relative to the light source. A curled negative misses focus in part of the frame, especially in camera scanning. On both paths the holder is one of the small parts that most decides the quality of the scan. Which path is chosen depends on the volume and purpose of the work: for someone who scans a few rolls now and then a flatbed scanner may be enough, while for someone who shoots film regularly and wants large prints, camera scanning may become more efficient over time. Some photographers, on the other hand, leave their important frames to a lab's professional scanner.

How are the reversed tones and the orange tone fixed?

Inversion is the process that turns the image into a positive by turning the light tones in the negative into dark, the dark tones into light, and the colors into their complements. Scanner software often does this by itself; in a file scanned with a camera, on the other hand, inversion is done in the editing program, by swapping the two ends of the tone curve or with a tool made for the job. With black-and-white negatives inversion is relatively simple; afterward, setting the black and white points and shaping the midtones with the tone curve may be enough.

The orange mask is the layer in the base of color negative film that gives the whole negative an orangey color. When inverted, this orange tone shows up in the image as a strong blue-cyan shift. That is why the mask is neutralized before inverting: a white balance sample is taken from the blank area of the film between frames that received no light, and the orange tone is zeroed out. Then the colors are fine-tuned separately for each frame.

When inverting color negative, skin color is a sensitive checkpoint. An automatic inversion tries to pull the frame toward an average gray; if a dark-skinned face covers most of the frame, the face can come out too light and pale, and if a light-skinned face covers it, too dark and red. Instead of applying the same setting to the whole roll, correcting each frame by sampling from the midtones in the face and looking at them side by side on screen keeps different skin tones in their own color. If the shadows of a dark-skinned face have closed up, lifting the bottom end of the tone curve slightly can bring detail back; but detail that isn't in the negative won't appear in the scan either. While correcting the frame it also helps to remember the light on the day of the shoot: if the exposure notebook says a shaded table or evening sun, leaving the colors according to that light's warmth gives a more honest result than pulling everything to the same neutral gray.

How are dust, scratches and the file managed?

Every grain of dust on the negative blocks light and appears as a white speck in the inverted image. That is why the negative is blown off with an air blower before scanning, and the surface of the light source and the holder's glass are cleaned. Negatives are touched not with bare fingers but held by their edges. The small spots that remain are cleaned up in editing; permanent scratches, on the other hand, are usually on the negative itself and call for careful retouching.

The file also calls for a decision. In camera scanning, a raw file leaves the widest margin for inversion and color adjustment. On a scanner, a resolution sufficient for the print size is chosen; a higher resolution than needed only slows the scan and enlarges the file. If each file's name carries the roll's date and the frame number, the negative sleeve, the exposure notebook and the file are linked to each other.

Visual evidence

Your friend first scans the black-and-white roll with the older member's setup. They place the negative in the holder and put it on the light box, align the camera so it is exactly parallel, and shoot the thirty-six frames in half an hour. In the frames they invert in the editing program the two men playing backgammon appear; when they shape the tone curve slightly, both the texture on the dark-skinned man's cheek and the detail on his light-skinned friend's forehead stay in place.

Then they put the color roll they shot at the market on the flatbed scanner. In the scan that comes out with the automatic setting, the photo of the two siblings is cold and bluish; the dark-skinned sibling's face has turned gray. They neutralize the orange mask from the blank film area between frames and readjust by sampling from the midtones in the face; the two siblings' skin regains its warmth.

While choosing the best three frames, before sharing the photos of the two siblings and the men playing backgammon, they show the photos to them and ask whether they allow them to be shared. The three frames appear on the club's page, each with a line from the exposure notebook.

Common mistakes

Summary

A negative is either read line by line with a flatbed scanner or photographed on an even light source with a camera parallel to the negative; on both paths the negative is kept flat and clean with a holder. Inversion turns tones and colors back into a positive, and with color negative the orange mask is neutralized from the blank film area before this; each frame is corrected separately from the midtones in the face so that different skin tones stay in their own color and the shadows of dark-skinned faces are preserved, dust is reduced before scanning, and the file is named with the roll's date.

Mini assignment

In this assignment you will do the work that closes the module: you will shoot a roll of film, develop it or have it developed, scan it and share the best three frames.

1. Shoot a roll of film; keep an exposure notebook and include people of different skin tones in at least one frame.
2. Develop the roll yourself or give it to a lab; put the negatives in sleeves and write the roll's date.
3. Scan the negatives with a scanner or a camera; if it is color negative, neutralize the orange mask from the blank film area, correct each frame separately from the midtones in the face, and check that the skin tones stay in their own color.
4. Choose the best three frames; if there are recognizable people in them, show them before sharing and ask for permission. Share the frames, each together with a line from the exposure notebook and a short process note.

Check yourself

• Can you explain the difference between a flatbed scanner and camera scanning?
• Were you able to neutralize the orange mask and invert a color negative with correct colors?
• Did you confirm that every skin tone appears in its own color in the frames you shared, and that the people gave their permission?

Glossary

Mini quiz

1. In camera scanning, what does the camera not being parallel to the negative lead to?

• A) The colors being inverted
• B) One edge of the frame staying sharp and the other blurred
• C) The orange mask disappearing
• D) The dust decreasing

2. What happens if a color negative is inverted without neutralizing the orange mask?

• A) The image shifts to a blue-cyan tone
• B) The image becomes black and white
• C) Nothing changes
• D) The image shifts to red

3. Where do the white specks seen in a scan mostly come from?

• A) From the orange mask
• B) From inversion
• C) From dust on the negative or the surfaces
• D) From the raw file

4. How is a roll with different skin tones corrected?

• A) A single automatic setting is applied to the whole roll
• B) Only the first frame is corrected
• C) All the frames are converted to black and white
• D) Each frame is corrected separately from the midtones in the face

Answers

1. B — If the negative and the sensor aren't parallel, the plane of focus misses part of the frame.
2. A — When inverted, the orange base turns into a blue-cyan shift, its complement.
3. C — Dust on the negative blocks light and, when inverted, appears as a white speck.
4. D — An automatic setting pulls the frame toward average gray; sampling each frame from the face keeps skin tones in their own color.

Summary card

• A scanner is easy but slow; a camera is fast but needs setup.
• Keep the negative flat with a holder, align the camera parallel.
• With color negative, first neutralize the orange mask, then invert.
• Correct each frame separately from the midtones in the face.
• Reduce dust before scanning; ask for permission before sharing.

Bridge to the next lesson

A week after the three frames are published on the club's page, the mother of the two siblings from the market sends your friend a message: she wants a large print of the siblings' photo and wants to ask the price. The same day a café in the neighborhood asks whether they could shoot a few photos for its menu. Your friend thinks for the first time about being paid for their photos, and wonders in what forms this could happen. What could the 10 ways to earn money with photography be? The next lesson takes up the paths to going professional, stretching from client work to stock photography, from teaching to print sales and content production.