Lumariver makes software tools for the photographer. Our main
focus is landscape photography but the tools can also be
useful in other genres.
We are a small group of software development specialists that
also have a passionate interest in photography. In Lumariver
we combine this and make software that solves challenges we
encounter ourself in our own photography. We can truthfully
say that our software is made for enthusiasts, by
Lumariver is located in Sweden and owned
by Xarepo AB.
Lumariver HDR does merging of multiple exposures into one
noise-free high dynamic range file and tonemapping of such files or single
Gallery quality: merging images with no visible seams or ghosting, and halo-free tone-mapping.
Full visibility of what the software has done to ease critical inspection.
All processing available as layers, allows manual override and tuning for cases that requires artistic decisions.
Flexible import and export to allow many different workflows involving other imaging software.
Photographer in control: results from algorithms easy to understand and fine-tune.
Supports raw-in-raw-out workflow for best integration with popular raw converters.
Flatfield correction / lens cast calibration (LCC) to support
digital medium format technical photography.
The Lumariver HDR merging algorithm primarily employs
stitching instead of blending. The seams are narrow and put
in as inconspicuous places as possible. One advantage of
this approach is that ghosting is avoided, i e no blurry
figures from blending together images where something has
moved. The algorithm tries to form large contiguous areas,
while avoiding poorly exposed or clipped pixels. Having
large areas makes the result easier to manually edit if one
would want to.
In addition to this main merging algorithm Lumariver HDR
also have a always-use-best-exposed-pixel merging algorithm
suitable for repro photography when zero movement and stable
light can be guaranteed.
If you wish, merging can be made from raw files and then be saved to a
raw output file (DNG), so it can be treated in your favourite
raw converter as if it was a single exposure, only with
In some situations the dynamic range of the scene is so
large that the camera cannot capture it without either
clipping highlights or getting very noisy shadows. The
noise comes both from camera electronics but also the
lack of light, the photon shot noise. The solution is to
shoot the same scene with different shutter speeds in
quick succession, to capture well-exposed shadows and
unclipped highlights. The exposures here are 1/13, 1/50
and 1/200 (3 exposures, 2 stops between each).
This scene is a tough one since we have moving water in
it. Rather than just picking "the best exposed pixels"
Lumariver HDR's top priority is to avoid ghosting and
visible seams. In this case the sun and highlights are
taken from the darkest exposure, including the moving
water as it's connected to highlights, large parts of
the sky from the middle exposure and the darkest shadows
from the brightest exposure. Note that the seams are
made wider in low contrast areas to avoid visibility
(due to slight differences in noise levels between
100% crop of detail showing the seams and the resulting
image, and a small crop showing the noise level if only
the darkest exposure would be used; ugly chroma noise
would then become apparent. In this crop the darkest
exposure has been used for the small specular highlights
and the moving water (marked in red).
Finished tonemapped image. The merged image can for
example be exported to a multi-layered 16 bit tiff for
further treatment in your favourite image editor, with
or without tonemapping applied. It is also possible to
inspect the merge masks directly in the software. We
think this is important since an automated algorithm can
never guarantee absolute perfection in all cases this is
needed, but also for the photographer's artistic
integrity. Lumariver HDR does not employ any black magic
merging techniques, just layer masks and gives the user
full access to them.
Dramatically put, the tonemapper of Lumariver HDR is
designed for those who don't like HDR. It's all about
natural-looking results, and nothing about that grunge HDR
look we all know from the web. If the casual gallery viewer
doesn't think any processing was used at all and the expert
thinks it's the result of a well-balanced all-manual work,
then Lumariver HDR has done what it should.
Most HDR tone compressors make a hefty local contrast
increase to fit the tonal range, which gives a very specific
HDR look. The Lumariver HDR tonemapper avoids this and
instead uses methods similar to traditional dodge-and-burn
to shift large contiguous areas in relation to
each-other. This gives a more natural result, which also can
be recreated in any photoshop-like software (with enough
time and patience).
We have not tried to make a unique look, but exactly the
opposite. For fine art images we think it is important that
post-processing software is neutral in terms of look, as it
helps in making the prints timeless. We like to see the
tonemapper output as an automated dodge-and-burn which can
be used as is or as a starting point for further manual
This scene is backlit from the sky. For the naked eye
which has a huge dynamic range there is no problem to see
all details and colors in the sky, mountains and
ground. For the camera it's different. To not blow the
highlights in the sky the image out of the camera has a
very dark foreground.
The same image processed with Lumariver HDR tonemapper,
which yields an image both truer to the eye and better as
a print. Note that all details and contrast in the sky is
kept, while the foreground is considerable brighter. There
is no haloing, the result is natural and photographic, far
from the "grunge HDR" look which has made HDR (in)famous.
This is the tonemap Lumariver HDR generated for the image,
which can be extracted edited and reapplied if you would
want to make any detail adjustments. Note the sharp edge
which has been detected between sky and ground. The hard
edge algorithm is a "secret" of the tonemapper, this is
what makes it good at retaining natural contrast of
different features while fitting them together in the
narrow dynamic range available on a screen or print. Being
able to see exactly what the software has done and edit it
if needed is a central feature, Lumariver HDR lets the
photographer be in total control.
A 100% crop of the edge of the tonemapped image
(unsharpened). No visible artifacts even at close
inspection is a key goal of Lumariver HDR. Hard edge
transitions is not always the best solution though, if the
edge is not sharp enough or the difference in brightness
too small a softer transition works better. Lumariver HDR
auto-detects these and makes soft transition zones in
This is a before/after 100% crop of an other image showing
the tonemapper's ability to avoid halos around complex
edges even when compression is high. The sky has here been
lowered 1.5 stops. Note that the local contrast and
saturation of both the sky and the forest has been
The multiply blend mask of the same crop generated by the
tonemapper, which is available to the user for inspection
and/or further use in an image editor. Computer algorithms
can never be 100% perfect, so if you are working on an
important image and you are a perfectionist, you will want
to make some manual adjustments in an image
editor. Lumariver HDR is designed to allow this.
The Lumariver Depth of Field
Calculator (Lumariver DoF) is an app for your mobile device that helps
you maximize the sharpness of your photographs. It's primarily intended
for landscape, architecture and similar photography genres where the
goal is to have a sharp image front to back. It's designed for being a
practical tool in the field, and it has a
thorough user manual that describes how
it's used in real use cases.
There are lots of Depth of Field apps out
there, but none that fulfilled our own requirements for our own
photography needs — to actually be used smoothly and effectively in
the field when shooting, both using normal and tilt-shift
lenses. That's why we made this app.
It's available for Android and iOS and the user interface is optimized
for one-hand operation on mobile phones, but it also works on tablets.
Animated diagrams to visualize the depth of field.
Here you can download Lumariver HDR. The downloaded software
is fully functional but will watermark the output. To get rid
of the watermark you need to purchase a license key which you
enter into the software after installation.
You may install the software on as many computers as you want
as long as it's you that uses the software. The license will
of course be valid for bug fixes and minor version
upgrades. Here is the End User License Agreement: EULA. It's a
standard one with the usual disclaimers.
We handle purchases through PayPal. When you make a purchase
you will get an email with the license key sent to you (it's
automatic so you get it immediately, or within an hour
depending on your email provider's grey list function). Then
you enter your email address together with the key into the
software and you can start using it right away.
The Lumariver Depth of Field calculator app is distributed
via Google Play for Android,
App Store for iOS. Click the links or start the store app
and search for "lumariver" and you will find it.