LuttieHow to Color Correct HEIC Photos Online (iPhone & iOS Images)
Open and color grade HEIC and HEIF images from iPhone directly in your browser. No Lightroom, no conversion tools, no install needed.
iPhones have shot in HEIC by default since iOS 11. It's a great format — smaller files than JPEG at the same quality, wider color gamut, better HDR handling. But the moment you try to color correct a HEIC file online, most tools either refuse to open it, silently fail, or strip the color data on conversion. Luttie opens HEIC and HEIF files directly in the browser and gives you a full grading environment without any conversion step.
No Lightroom. No third-party HEIC converter. No download.
What Is HEIC / HEIF?
HEIC (High Efficiency Image Container) is Apple's implementation of the HEIF (High Efficiency Image Format) standard. It uses HEVC compression — the same codec as H.265 video — to store images at roughly half the file size of a comparable JPEG.
Every iPhone from iPhone 7 onwards shoots HEIC by default in the standard camera app. iPad Pro, iPad Air, and Mac users saving from Photos also produce HEIC files. The format supports:
- 10-bit color depth — more tonal range than 8-bit JPEG
- Display P3 wide color — the full gamut your iPhone screen and modern monitors can show
- HDR metadata — Dolby Vision or HDR10 gain maps in supported captures
- Transparency — unlike JPEG
The wide color gamut and 10-bit depth are exactly why HEIC files benefit from proper color grading rather than a straight conversion to JPEG.
Why HEIC Color Correction Is Different
When you shoot on iPhone, Apple's image pipeline applies several automatic adjustments before the file is written:
- Smart HDR / Deep Fusion — multi-frame compositing to recover highlights and shadows
- Tone mapping — the camera curve that converts sensor data to a pleasing screen-ready image
- Display P3 color — the file is encoded in a wider gamut than standard sRGB
The result is a photo that looks great on your iPhone screen but may look oversaturated or tonally shifted when opened in software that doesn't interpret the color profile correctly. HEIC files also carry Apple-specific metadata that some converters ignore.
Luttie decodes HEIC natively and preserves the color data through the grading pipeline so you're working with what was actually captured.
Step 1 — Open the Editor
Go to luttie.app/editor. No account required to start grading.
Step 2 — Drop Your HEIC File
Drag your .heic or .heif file onto the upload zone, or tap browse files on mobile. Luttie decodes the file in the browser — you'll see the decoding spinner while it processes, typically a few seconds depending on file size.
Once loaded your image appears on the canvas at full resolution with the grading panel ready on the right.
Step 3 — Correct Exposure First
iPhone's Smart HDR pipeline is aggressive. It often produces images that look clean on screen but have a slightly flat, compressed look compared to the original scene contrast. The histogram in the Basic Correction panel will show you where the tones actually sit.
Common starting adjustments for HEIC from iPhone:
- Exposure — usually near-correct, but shadows can be lifted too far by Smart HDR. Push down slightly to reintroduce depth
- Whites — highlights are often preserved well. A small push up if they look dull
- Blacks — lift for a matte grade, crush for drama
- Contrast — the in-camera tone mapping reduces midtone contrast. Adding some back here gives the image more punch
Step 4 — Address the Wide Color Gamut
Display P3 has a significantly wider gamut than sRGB — particularly in the reds and greens. This is why iPhone photos can look slightly oversaturated on non-P3 displays or when exported to standard JPEG for web use.
If you're grading for web or social media delivery:
- Use the HSL Secondary panel to pull back any hues that feel pushed — typically reds (skin tones and foliage) and cyans (skies)
- Use the Saturation slider in the color wheels to globally reduce chroma if the image looks vivid compared to how you remember the scene
If you're grading for a P3 display (iPhone, newer Mac, modern TV), lean into the gamut — the color is real and the destination screen can render it.
Step 5 — Use Curves for Tonal Control
The iPhone camera applies its own tone curve before writing the HEIC file. To rework the tonal response:
- Master curve — a gentle S-curve (lift shadows slightly, ease highlights) gives a clean contrast increase without crushing either end
- Shadow lift — dragging the bottom-left anchor up gives a matte, modern look that works well on street and portrait content from iPhone
- Highlight roll-off — ease the top-right anchor down slightly to soften bright areas. Smart HDR tends to preserve highlight detail — the curve roll-off makes it look more natural
Individual R, G, B curves let you push color into specific tonal ranges. For portrait work, a slight warmth in the midtone curve (lift red, lift green fractionally) works well with iPhone's skin rendering.
Step 6 — Color Wheels
The three-way color wheels control shadows, midtones, and highlights independently.
For iPhone portrait and lifestyle content, a classic treatment:
- Push shadows slightly cool (blue or teal)
- Keep midtones neutral or fractionally warm
- Pull highlights warm (orange or gold)
The Lightness slider under each wheel lifts or crushes that tonal range — click the number to type an exact value for precise control.
Step 7 — Apply a LUT (Optional)
If you have a .cube LUT — a preset from a pack, a grade from Resolve, or one you've exported from a previous Luttie session — drop it into the Custom LUT zone in the Creative section. The LUT applies on top of your corrections.
Luttie also includes built-in creative presets if you want a starting point: Classic B&W, Warm Golden Hour, Cinematic Teal, and others.
Step 8 — Export
Export PNG or Export JPG from the bottom of the panel. Full resolution output, no watermark.
On Pro, Export LUT (.cube) bakes your entire correction into a portable LUT you can reuse across other iPhone photos in DaVinci Resolve, Premiere Pro, or Final Cut Pro — useful if you're batch processing a shoot.
Step 9 — Save Your Project
Hit Save project in the amber banner before closing. Your grade is stored in the browser — come back to Luttie, reload the project, and everything is exactly where you left it.
HEIC on iPhone vs. HEIC from Other Devices
While iPhone is the most common source of HEIC files, you may also encounter them from:
- iPad — same pipeline as iPhone
- Mac — Photos app and some third-party apps export HEIC
- Windows 11 — can save HEIC through certain codecs
- Some Android devices — a handful of manufacturers have adopted HEIF
Luttie handles HEIC from all these sources. The color correction approach is the same — check the histogram, address exposure, work the curves and color wheels, export.
Common HEIC Questions
My HEIC file looks different after opening — is that normal?
Slightly. Browser rendering and in-app rendering interpret ICC profiles differently. The underlying color data is intact. If something looks significantly off, use the Temperature / Tint sliders in Basic Correction to bring it back to neutral before grading.
Can I convert HEIC to JPEG with Luttie?
Yes — use Export JPG. The exported file is a standard sRGB JPEG at your graded settings. No extra conversion step needed.
Does Luttie support Live Photos?
Luttie handles the still frame (HEIC component) of a Live Photo. The video component (.mov) would need to be uploaded separately if you want to grade the motion part.
Open a HEIC file in the editor →
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