Module 1 · Exposure Fundamentals & RAW Files
Goal: understand the exposure triangle (ISO, aperture, shutter speed), why RAW files give you more editing room than JPEG, and how to read a histogram before touching any sliders.
📱 Use NotebookLM on your phone
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How to use NotebookLM here
Click "Copy YouTube links" and open NotebookLM. Add the links as sources, then ask questions about exposure and RAW while editing a real photo.
Questions to ask NotebookLM:
- "When should I raise ISO vs open the aperture wider?"
- "What does a histogram clipped on the right actually mean for my edit?"
- "Why does a RAW file look flat compared to the in-camera JPEG?"
- Scan QR code with your phone camera
- Click "Copy YouTube links"
- Open NotebookLM → create notebook → add sources
- Wait ~30 sec and start asking
Recommended videos
Key concepts
- Exposure triangle: ISO (sensor sensitivity — noise tradeoff), aperture (f-stop — depth of field), shutter speed (motion blur). Changing one requires compensating with another to maintain correct exposure.
- Stops of light: doubling or halving light = 1 stop. ISO 100 → 200 = +1 stop. f/2.8 → f/4 = −1 stop. 1/125s → 1/250s = −1 stop. These are equivalent — swap freely.
- RAW vs JPEG: JPEG = processed and compressed in-camera (12-bit → 8-bit, lossy). RAW = unprocessed sensor data (~14-bit), ~4× more tonal range for editing. Photomator opens Fujifilm .RAF files natively.
- Histogram reading: x-axis = brightness (left = shadows, right = highlights). y-axis = number of pixels. Clipping on left = crushed blacks (detail lost). Clipping on right = blown highlights (unrecoverable). Ideal: no hard clipping, but the shape depends on the scene.
- ETTR (Expose to the Right): expose as bright as possible without clipping highlights. RAW captures more data in brighter tones — pulling shadows up in post adds noise, pulling highlights down does not.
- Photomator histogram: live histogram visible in the editing panel. Use it to guide adjustments — don't rely on the screen alone (display brightness varies).
Self-check exercises
1. You're shooting indoors at f/2.8, ISO 1600, 1/60s and the photo is still underexposed by 1 stop. What are your three options and which would you choose for a portrait?
Options:
- Open aperture to f/2 — gains +1 stop, shallower depth of field. Good for portraits (subject separation), but you may already be at your lens limit.
- Raise ISO to 3200 — gains +1 stop, more noise. Fujifilm X-Trans handles ISO 3200 well; acceptable for social media but noticeable at print size.
- Slow shutter to 1/30s — gains +1 stop, motion blur risk. At 1/30s a still subject is usually sharp; a moving one (children, hands) may blur.
2. You open a RAW file from the X-T30 III in Photomator and the image looks flat and dull compared to what you saw on the camera screen. Why, and what do you do?
The camera screen showed a JPEG preview rendered with Fujifilm's film simulation (e.g. Provia/Classic Chrome). The RAW in Photomator is unprocessed — flat is correct and expected.
What to do:
What to do:
- The flat starting point is an advantage — you have full tonal range to work with.
- Start with the basic panel: lift exposure if needed, add contrast, adjust highlights/shadows.
- If you want the Fujifilm film look, recreate it with HSL + tone curve or apply a preset that mimics the simulation.
- Don't try to "restore" the JPEG preview — build the look intentionally instead.
3. Your histogram shows a spike jammed hard against the right edge for a Barcelona sunset photo. Is this a problem? What would you do?
Yes, it's a problem — the highlights are clipped. In a sunset the sky is the main subject, so losing highlight detail in the clouds/gradients is a real loss.
In Photomator:
In Photomator:
- Pull the Highlights slider left (−30 to −70) — recovers detail in RAW files because sensor data exists even above display white.
- Use the Whites slider to set the true white point after recovering highlights.
- If the sun disc itself is clipped — that's usually acceptable (the sun is a light source, not a detailed subject).
- Check: enable "show highlight clipping" overlay if Photomator supports it.