Easy Corona

For total eclipse photos

The corona you saw, in a single image.

Easy Corona merges all your totality exposures into an HDR and brings out the filaments of the corona. No layers, no masks and no Photoshop.

Windows 10 and 11 · macOS 15 or later · in English and Spanish · version 1.4.6

Photo: Iker Zubizarreta

Why you need it

No single photo holds the whole corona

During totality the corona is thousands of times brighter next to the Moon than in its distant streamers. That is why you shoot a series, from fractions of a millisecond to a second.

The short ones keep the Moon's edge and the prominences; in the long ones those are already burned out.

The long ones capture the distant streamers, which don't even show up in the short ones.

Easy Corona aligns them on the Moon, stacks them into a 32-bit HDR and enhances the fine detail all the way out.

Before and after

Move the line

On the left, the HDR as it comes out of the stacking. On the right, the same HDR after Easy Corona.

The eclipse HDR without enhancement: the corona is a white halo without detail The same HDR with Easy Corona: the filaments of the corona, the prominences, the earthshine on the Moon, the stars and the blue sky HDR as is With Easy Corona
Photo: Iker Zubizarreta · 600 mm · with earthshine, prominences and stars (beta)Same framing and same HDR in both halves

Your look

Same photos, seven looks

The same HDR, seven looks. The first one is my own version. The other six come straight out of Easy Corona, with no retouching in other programs: from less to more detail, with a white corona or its original color, and softer or stronger earthshine on the Moon. All six come inside the app as styles: one click, then you fine-tune it with the sliders while the live preview shows you the result before you save it.

  • The cream-colored corona with its long streamers on a blue sky, the red prominence on the Moon's edge and the Moon with its maria
    My versionMy favourite.
  • The white corona, soft and bright, with no added detail, on an eclipse-blue sky; the Moon barely lit by earthshine
    NaturalWhite corona and soft earthshine.
  • The white corona with its streamers enhanced on a blue sky with stars; the Moon's maria can just be made out
    Fine detailFine streamers, white corona and medium earthshine.
  • The white corona with strongly defined streamers reaching far from the Sun and stars in the blue sky; the Moon with its maria clearly lit by earthshine
    More detailBold streamers, white corona and strong earthshine.
  • The corona in its original color, a warm orange, soft and with no added detail; the Moon barely lit by earthshine
    NaturalOriginal color and soft earthshine.
  • The corona in its original orange color, with its streamers enhanced; the Moon's maria can just be made out
    Fine detailFine streamers, original color and medium earthshine.
  • The corona in its original orange color, with strongly defined streamers and stars; the Moon with its maria clearly lit by earthshine
    More detailBold streamers, original color and strong earthshine.
Photo: Iker Zubizarreta · 600 mm · the other six straight out of Easy Corona (cropped)Try it with your photos in the free version

What it does

The app does the hard part

Align

On the Moon or on the corona

Aligns every exposure even if the tripod moved or the mount didn't track well.

Stack

32-bit HDR

Combines all the exposures into one image with the full range of the corona.

Enhance

Fine detail

Multiscale filters (MGN and WOW) that reveal filaments that no single photo shows.

Color

Eclipse sky and gray Moon

The measured blue of the sky during totality, and the Moon in a uniform gray.

Chromosphere

Sharp prominences, a single Moon

The fastest photos are stacked separately and added at the end, with no ghosts on the Moon's edge.

Moon

Earthshine

The lunar maria, lit by the Earth, from your long photos or from the HDR itself.

Beta

Clean stars

Finds the stars, removes the dark ring the filters leave around them (and the hot pixels) and puts them back with the brightness and the number you choose, or removes them for a clean sky. With their mask, for other programs.

Beta

Two focal lengths in one image

Merges the photos from two lenses: the detail of the long one with the field of the short one.

Cameras

Your RAW files, as they are

Canon, Nikon, Sony, Fujifilm, Panasonic, Olympus, Pentax and DNG. Darks, bias and flats too.

Preview

What you see is what gets saved

Every slider shows up instantly, with the same calculation as the final result.

Practice

Practice photos

A real eclipse, the 2026 one, as RAW files or as a ready-made HDR, to learn before using your own photos.

Languages

In English and Spanish

The app opens in your computer's language, and you can change it in a menu.

Under the hoodEvery step and every filter, explained with images of a real eclipse.

How it works

From the memory card to the corona

  1. Add the photo folder

    The app reads the exposure of each RAW file and groups them by itself.

  2. Create the HDR in one click

    It aligns, averages and stacks. If you already have an HDR from another program, start at step 3.

  3. Adjust and save

    A few sliders in the Simple mode; full control in the Advanced mode. Save as 16- or 32-bit TIFF, PNG or JPEG.

Step-by-step tutorialUnder the hood

The Easy Corona window in the Simple mode: the six one-click styles (Natural, Fine detail and More detail, with a white corona or its original color) and the eclipse preview on the right

Versions

Try it free with your photos

The free version does everything at reduced resolution. When you see your corona, choose yours.

Free

To try it with your photos.

€0

  • Every feature, to see the result
  • Images at 1200 px, with a watermark
  • Practice photos by zu2pic, if you don't have yours yet
  • Doesn't save or export images
Free download

Premium

To get your corona in one click.

€19.99one-time payment

  • Create the HDR at full resolution
  • Automatic enhancement with the Simple mode
  • Saves as TIFF, PNG and JPEG
  • Advanced mode for viewing only
  • No presets
Buy Premium

The full one

Premium+

For those who want to control every step.

€49.99one-time payment

  • Everything in Premium
  • Full Advanced mode: MGN, WOW, NAFE, FNRGF, enhancement passes, color and Moon
  • Presets: save your settings and share them
Buy Premium+

Already have Premium? Move up to Premium+ by paying only the difference: €30.00. In the app: License menu → Upgrade to Premium+.

Upgrade to Premium+

One app for the three versions: it downloads for free and, when you buy, it is activated with the key you receive by email · license for one computer · one year of updates included

Requirements

Before you download

System
64-bit Windows 10 or 11, or macOS 15 Sequoia or later (Mac with Apple silicon or Intel)
Memory
16 GB recommended for 24–26 Mpx photos (with 8 GB it runs slower)
Disk
500 MB for the app and several GB free while the HDR is created
Internet
Not needed: everything is processed on your computer

Easy Corona for Mac

For macOS 15 Sequoia or later. There is a download for each type of Mac: check it in the Apple menu → About This Mac.

Mac with Apple silicon M1 or later Mac with Intel processor

Open the .dmg and drag EasyCorona to Applications. The first time, macOS asks for permission to open it (see “macOS won't open the app” in the FAQ).

What photos do I need?

A series of exposures of totality, in RAW or TIFF, ideally on a tripod and from 1/4000 s to 1 s. The more photos of each exposure, the less noise. An HDR already made in another program also works.

Windows says “Windows protected your PC”

It is the usual warning for new programs from small developers. To install:

  1. Click More info.
  2. Click Run anyway.
macOS won't open the app

The first time, macOS warns that it couldn't verify Easy Corona, because it is a new program from a small developer. To open it:

  1. Close the warning without moving it to the Trash.
  2. Go to System Settings → Privacy & Security.
  3. At the bottom it will say that EasyCorona was blocked: click Open Anyway and confirm with your password.

It is only needed the first time.

How do I activate the license?

After the purchase you receive a key by email. In the app: License → Activate license menu and paste the key. The check works without internet.

Can I use it on two computers?

Each license is for one computer. If you change computers, uninstall it from the old one and activate it on the new one.

What happens when the year of updates ends?

The app keeps working forever with the last version included. Only new versions released afterwards may ask for a renewal.

Does it send my photos anywhere?

No. All the processing happens on your computer and the app doesn't send any data.

What if I'm not convinced?

That's what the free version is for: try it first with your own photos. The full terms are in the license agreement.

Which languages is it in?

English and Spanish. It opens in the language of your computer, and you can change it in the View → Idioma · Language menu.