# What Is a RAW Photo? DNG vs JPEG on Android Explained

> A RAW photo is unprocessed sensor data, saved on Android as a DNG file — much larger than a JPEG, but far more recoverable when you edit it.

Source: https://www.sensepose.com/blog/what-is-a-raw-photo
Updated: 2026-09-30

A RAW photo is the unprocessed data straight off your camera's sensor, saved
before the phone turns it into a finished JPEG. On Android that file is almost
always a DNG. It's several times larger than a JPEG, looks flat until you edit
it, and isn't ready to post — but it holds information the JPEG has permanently
thrown away. What exactly gets thrown away, and when that matters, is the whole
question behind
[computational photography](/blog/what-is-computational-photography).

## What your sensor actually records

A camera sensor does not see colour. Each photosite is a light meter: it counts
photons and reports a number. Left alone, a sensor produces a grayscale image.

Colour comes from a **colour filter array** glued over the top — on nearly every
phone a **Bayer array**: a repeating 2×2 pattern of red, green, green, blue,
with two greens because human vision is most sensitive to green. Each photosite
therefore records one colour channel and is blind to the other two.

A RAW file is that mosaic saved as-is: one number per photosite, at **10 to 14
bits**, and — critically — **linear**, meaning the value is roughly proportional
to the photons that hit that spot.

Turning it into a picture requires **demosaicing**: estimating each pixel's two
missing channels from its neighbours. A good guess, but a guess — and every step
after it is another. A JPEG is the record of your camera making all of them,
then discarding the evidence.

## What the ISP throws away when it bakes a JPEG

Between the sensor and your gallery sits the **image signal processor**, running
roughly this order: demosaic, white balance, tone curve, colour matrix, noise
reduction, sharpening, a squeeze from 12-bit to 8-bit, then lossy compression.
Three of those steps are one-way doors.

**The bit-depth crush.** A 12-bit RAW channel holds 4,096 brightness levels; an
8-bit JPEG channel holds 256. Around 94% of the tonal steps are gone before you
open an editor — which is why pushing a JPEG's exposure bands the sky.

**The baked-in decisions.** White balance, the tone curve, noise reduction and
sharpening are applied, then flattened into the pixel values. You can't
un-sharpen a JPEG, only pile more processing on top — which is how photos end up
crunchy and plastic. (See our guide to
[avoiding over-processing](/blog/camera-app-without-over-processing).)

**The compression.** JPEG is lossy by design, subsampling colour and discarding
fine detail you're unlikely to miss — until you crop in.

None of this makes the ISP wrong. Its guesses are usually good, and its output
is a small file you can send immediately. RAW just preserves your right to
disagree later.

## RAW (DNG) vs JPEG, side by side

| | RAW / DNG | JPEG |
|---|---|---|
| **File size** | ~15–30 MB | ~2–5 MB |
| **Editing latitude** | 10–14 bit linear; survives heavy pushes | 8 bit; bands quickly |
| **White balance** | A tag, not applied — change it freely later | Baked in; corrections leave casts |
| **Highlight recovery** | Often 1–2 stops from unclipped channels | Anything at 255 is flat white |
| **Sharing convenience** | Needs conversion; many apps won't open a DNG | Universal — uploads anywhere |

Two of those rows do most of the real work.

**White balance** is the cleanest win. In a RAW file the camera's estimate is
recorded as metadata but never applied, so changing it later just means picking
different multipliers on untouched linear values. In a JPEG they were already
applied and clipped to 8 bits, so correcting a bad guess means stretching what
survived. Mixed indoor light and neon is where this rescues the most photos.

**Highlight recovery** is the biggest practical win. As a highlight brightens
the channels don't clip together — green usually saturates first while red and
blue still hold real values, so a converter can rebuild plausible colour from
the survivors, typically one to two stops' worth. A JPEG mapped that area to 255
and threw the difference away. The limit matters though: if the photosite
saturated in *every* channel, the data is gone. **Nothing recovers a truly
clipped highlight** — which is exactly why multi-frame cameras underexpose.

## What DNG is, and why Android standardised on it

Every sensor's raw output is idiosyncratic, so manufacturers each wrapped theirs
in a proprietary container — Canon's CR3, Nikon's NEF, Sony's ARW — and every
new model meant new decoding support.

**DNG** — Digital Negative — is Adobe's answer: an open, documented, TIFF-based
RAW container published in 2004. It carries the sensor mosaic plus the metadata
needed to interpret it: filter pattern, black and white levels, colour matrices,
as-shot white balance. Android adopted it with the **Camera2 API** in 2014,
which added RAW capture and a `DngCreator` class to write the file. One open
format across thousands of different phones was the only workable choice.

The caveat is real: **RAW capture depends on your phone exposing it through
Camera2, and that varies a lot by device.** Phones reporting a `LIMITED` or
`LEGACY` hardware level may not offer RAW at all, and many that do offer it only
on the main camera, not the ultrawide or telephoto.

## Why a merged RAW burst beats a single RAW frame

Here's the point most RAW explainers miss: **a single RAW frame is not
automatically better than a well-processed JPEG.** It carries exactly the noise
the sensor produced, with none of the multi-frame denoising your stock camera
quietly performs. Shoot one DNG at night and you'll often get a *worse* looking
file than the phone's own JPEG. What one RAW frame buys you is **latitude**, not
quality.

You get both when the frames are *merged*. Capture a burst, align it and average
it, and random noise partly cancels while the scene signal stays put — noise
falls roughly with the square root of the frame count. Because RAW values are
linear, that averaging is physically meaningful arithmetic rather than a
cosmetic blur, so the result keeps RAW's latitude *and* gains clean shadows. The
mechanism is broken down in
[what RAW HDR+ actually is](/blog/what-is-raw-hdr-plus).

This is where Android's RAW apps diverge. Open Camera and ProShot save a DNG,
but it's one frame, one file — no merging. Adobe Lightroom captures DNG and
edits it well, but wants an Adobe account and a subscription for the full
feature set. GCam ports do merge, but they're per-model builds with
device-dependent results that lock you to auto exposure — a gap covered in
[GCam vs an AI camera app](/blog/gcam-vs-ai-camera-app).

## When to shoot RAW — and when not to

**Worth it:** high-contrast scenes where you're protecting a sky or a window;
mixed or coloured artificial light; [low-light shots you intend to
edit](/blog/best-low-light-night-camera-app); anything you'll print or crop into
hard; and product work where colour accuracy beats turnaround.

**Not worth it:** fast candids, kids and pets; anything going straight to a
chat; documents and receipts; and any case where you know you won't edit the
file. A DNG you never open is strictly worse than the JPEG you'd have had.

If your app offers **RAW + JPEG**, that's the pragmatic default. RAW is a
starting point, not a look — turning one into a finished photo is an editing
skill, covered in
[making phone photos look professional](/blog/how-to-make-phone-photos-look-professional).

## Why SensePose

To be clear up front: **SensePose** doesn't shoot RAW or save DNG files. It
takes a single photo and enhances it **on-device** as you take it, with better
colour and tone in a Natural or Punchy look, a mild denoise for low light, and
AI face enhance on arm64 phones with 3 GB RAM or more. It's for people who want
a finished photo without editing a DNG. If you want RAW files to grade
yourself, use your stock Pro mode or an app like Open Camera.

The first 5 enhanced photos are free; after that, photos still save free at
full resolution, and one small payment unlocks enhanced photos forever, with no
subscription. There's no account or sign-in, your photos never leave your
phone, and enhancing works offline. It runs on Android 8.0 or newer.
SensePose is [an AI camera
app](/blog/best-ai-camera-app-android), and it's on Google Play.

## FAQ

### What is a RAW photo?

A RAW photo is the unprocessed data read straight off a camera's image sensor,
saved before the camera converts it into a viewable JPEG. It stores one 10- to
14-bit linear value per photosite, with no white balance, tone curve, noise
reduction or sharpening applied — flat-looking straight out of the camera, but
far more editable than a JPEG.

### Is DNG better than JPEG?

DNG is better for editing; JPEG is better for sharing. A DNG keeps 10–14 bits of
linear sensor data, so white balance can be changed with no penalty and
clipped-looking highlights can often be pulled back one to two stops. A JPEG is
crushed to 8 bits with those decisions baked in permanently, but it's far
smaller and opens anywhere.

### Do RAW photos take up more space on Android?

Yes, substantially. A DNG typically runs 15–30 MB against 2–5 MB for the same
shot as a JPEG — roughly five to ten times the storage. DNG is only lightly
compressed and keeps every sensor reading at full bit depth, so there's no way
around it. Most people shoot RAW selectively rather than for everything.

### Can every Android phone shoot RAW?

No. RAW capture requires the phone to expose sensor data through the Camera2
API, and support varies widely by device. Phones reporting a `LIMITED` or
`LEGACY` Camera2 hardware level may not offer RAW at all, and many that do offer
it only on the main camera, not the ultrawide or telephoto lens.

### Should I shoot RAW or JPEG on my phone?

Shoot RAW when you plan to edit and the scene is difficult — harsh backlight, a
bright sky you want to keep, or mixed lighting where white balance is likely to
guess wrong. Shoot JPEG for fast candid moments and anything you'll post
immediately. A RAW file you never edit is just a larger, duller JPEG.

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