Panasonic Lumix DMC-GM1 Review
JPEG Tone Curves /Dynamic Range
Our Dynamic Range measurement system involves shooting a calibrated Stouffer Step Wedge (13 stops total range) which is backlit using a daylight balanced lamp (98 CRI). A single shot of this produces a gray scale wedge from the camera's clipped white point down to black (example below). Each step of the scale is equivalent to 1/3 EV (a third of a stop), we select one step as 'middle gray' (defined as 50% luminance) and measure outwards to define the dynamic range. Hence there are 'two sides' to our results, the amount of shadow range (below middle gray) and the amount of highlight range (above middle gray).
To most people highlight range is the first thing they think about when talking about dynamic range, that is the amount of highlight detail above middle gray the camera can capture before it clips to white. Shadow range is more complicated; in our test the line on the graph stops as soon as the luminance value drops below our defined 'black point' (about 2% luminance) or the signal-to-noise ratio drops below a predefined value (where shadow detail would be swamped by noise), whichever comes first.
This chart shows the Panasonic GM1's default dynamic range performance against a range of competitors - the APS-C Fujifilm X-M1, compact Sony RX100 II and a MFT peer, the Olympus E-P5.
With all dynamic range settings off, the GM1 shows a tone curve with a more gentle rolloff in shadow detail than at the highlight end, with a slightly steep incline before it clips to white. This is curious since we saw a new, more S-shaped tone curve from the GX7. The Fujifilm X-M1 and Sony Cyber-shot RX100 II both clip at roughly the same point, but show a slightly gentler rolloff in highlights. The Olympus E-P5 stands out from the group, retaining almost a stop more of highlight tone before clipping to white.
ISO 'Low' Setting
The GM1 offers a base ISO of 200 with the option of an extension ISO 125 setting. As the chart below shows, the extension setting sacrifices a little in the way of highlight tone.
Below you can see the effects of the GM1's various i.Dynamic settings. Higher settings use a lower-contrast tone curve to pull in more tone from shadow and highlight areas, bringing more of a gentle curve to the highlight end.
In the real-world example below, the GM1 takes on a very challenging high contrast scene. At Standard, High and Auto settings it chooses a faster shutter speed, recovering a little more of the highlight tone in the building facade. Shadows are lightened progressively from Low to High, and the washed out sky gains more blue tone. It's an effective feature, and the results don't look overly 'HDR-ish.'
As the charts above show, it has a greater effect on shadow tone than highlights, noticeably boosting tone in the leafy areas in the foreground and bringing back just a bit of highlight tone in the building facade. In the real world and in the studio test, the GM1's 'Auto' and 'High' results are almost identical.
|scrum break away by al booth|
from Sport competition
|Chinese Acrobat by lim yau tong|
|Parking Deck by Olaf R|
from Your City - Parking Garage
|Communication Tech by alberto_b|
|With & without by OBellini|
from Empty - Full
Firmware 184.108.40.206 for the Leica M10 is available now, adding support for a wider range of SD cards.
In this weeks' Throwback Thursday article, Simon raises a toast to the Sony Digital Mavica FD71 - a little camera which used really big memory cards.
It's been half a decade since Canon first debuted the original 6D and finally its successor is here. So what does five years of innovation look like?
The Canon EOS 6D Mark II brings more resolution, better autofocus and faster continuous shooting to Canon's entry-level full-frame camera. And we've had the opportunity to shoot with one.
The Canon 6D Mark II will ship to consumers in August, but we've been able to do some shooting with a pre-production unit well in advance.
Rumors have been swirling around for a while, and Canon has just unveiled the long-awaited successor to the popular and long-serving EOS 6D. Read all about it in our hands-on preview.
Canon's latest entry-level DSLR is here. The new Rebel SL2 (EOS 200D) is the belated successor to 2013's Rebel SL1, billed at the time as the smallest and lightest DSLR on the market.
Nearly five years after the announcement of the EOS 6D, Canon has finally replaced it with the EOS 6D Mark II. The Mark II features an all-new 26.2MP Dual Pixel AF full-frame sensor, 6.5 fps burst shooting, a fully articulating touchscreen, 1080/60p video and much more.
Canon has announced the EOS Rebel SL2 (also known as the EOS 200D), which replaces the aging SL1. This ultra-compact DSLR features a 24MP sensor, DIGIC 7 processor, Dual Pixel AF system and a 3" fully articulating touchscreen LCD.
When one of his friends got a filter stuck on his $1,700 Canon EF 24-70mm F2.8L, former MythBuster Adam Savage removed it using an unlikely, terrifying tool: a band saw.
The New Yorker asked Magnum's famed photographers, in town for the agency's 70th anniversary, to go out and capture 'the fleeting beauty of New York City's golden hour.' This is what they shot.
Roger Cicala is a difficult man to impress, but he's been waxing lyrical over at Lensrentals about Sony's new 12-24mm wide zoom.
Glassware is one of the most challenging subjects to photograph, especially against a white background. This tutorial shows you how to do it with hardly any gear.
Handevision is now shipping its all-metal Iberit 90mm F2.4 short telephoto lens for Leica M-mount 35mm and full-frame cameras.
Isocell comprises four sub-brands: Bright, Fast, Slim and Dual which are tailored to specific mobile device market demands.
The new store will be located at the Fotografiska center for contemporary photography in Stockhom, Sweden and carry the full range of Hasselblad products.
A recent vacation gave Richard a chance to think about the needs of travel photography – and how our reviews might recognize the perfect travel camera.
Need more evidence that 2017 is the year analog begins its comeback? Well, welcome another new film stock to the world.
The winners of the 10th annual iPhone Photography Awards have been announced, and they're striking.
If you were disappointed by reports that the Sony a9 struggles with adapted Canon glass, you might be able to take some comfort from Metabones' latest update.
Blackmagic Design has dropped the prices of its Video Assist external monitor/recorders for a limited time. Prices of the SD card-based recorders will be reduced in all markets, while supplies last.
Instagram has started testing a new feature called 'favorites' that enables users to share photos with only certain people. Only a small number of users have access to the feature at this time, though it may roll out to everyone in the future.
Lensbaby has announced the Velvet 85 F1.8 for interchangeable lens cameras. The lens is available in Canon, Nikon, Sony E, Sony A, Pentax K, Samsung NX, Fuji X and Micro 4/3 mounts.
It's the end of an era. Parent company Micron has announced that they are discontinuing the Lexar retail brand. This includes 'memory cards, USB flash drives, readers, and storage drives.'
Youthful trainspotter turned adult photographer, John Sanderson has traveled across the United States, documenting the country's railroads. But you won't find any trains in his pictures.
Sony's new CMOS sensor is backside-illuminated and offers an all-pixel global reset function which should drastically reduce rolling shutter effect when panning.
Shoulderpod has converted its offerings into a lego-like modular system by offering all individual parts of existing products separately, allowing users to build exactly the rig they need for a specific project or simply replace a damaged part.
Photographer Felix AAA has spent the past ten years touring the world with a variety of musicians, capturing behind the scenes shots and portraits. He talks about some of his favorite images on the FujiFilm Blog.
A roll of film discovered in an Argus C2 from an Oregon Goodwill turned out to contain some incredible images – and has been re-united with the original owner's family.
Nikon's 28mm F1.4E ED appears to roundly complete the company's updated lineup of fast, professional prime lenses. We've already seen some initial images from a Nikon ambassador, but we've worked through a gallery of our own, with a lens of our own over the past week. Take a look.