Canon EOS 550D (Rebel T2i / Kiss X4 Digital) In-depth review
Typically, shooting in raw mode will ensure that you get around 1 EV (one stop) of extra information available in highlights. Negative digital exposure compensation when converting such files can recover detail lost to over-exposure. As with previous reviews we settled on Adobe Camera RAW for converting raw files from the EOS 550D to retrieve the maximum dynamic range from our test shots.
As you can see the default Adobe Camera RAW conversion delivers slightly less dynamic range than JPEG from the camera (a more contrasty tone curve is the main culprit). It is, however, possible to get considerably more than this out of the file, (for example, our ACR 'Best' parameters) but doing so results in a very flat, totally unrealistic (and certainly 'unphotographic') image. The important point is that this additional information is there if you wish to selectively recover and blend-in this detail from a series of differently processed versions of the raw file.
- ACR Default: Exp. 0.0 EV, Blacks 5, Contrast +25, Curve Medium
- ACR Auto: Exposure -0.95 EV, Recovery 8, Blacks 0, Brightness 0, Contrast 0, Curve Medium
- ACR Best: Exposure -2.05 EV, Recovery 0, Blacks 0, Brightness +150, Contrast -50, Curve Linear
|ACR Default||7.4 EV|
|ACR 'Best'||11.7 EV|
Highlight tone priority in raw mode
The 'Highlight tone priority' (HTP) function expands dynamic range in the highlights and can be activated via C.Fn II-6. With HTP turned on the minimum ISO setting increases to 200. We've looked at this feature in previous reviews and in the dynamic range section of this review, and HTP works in exactly the same way in the EOS 550 as it does in other recent Canon DSLRs, including the EOS 7D.
|JPEG HTP OFF||JPEG HTP ON|
|RAW HTP OFF||RAW HTP ON|
Most of the time, the effect of HTP is likely to be fairly subtle in our experience, but it can make a huge difference to some scenes, like the one we've shown here. These four images are the product of two photographs taken in Raw + JPEG simultaneous capture, at the same ISO sensitivity and exposure values. With HTP turned off, the brightest areas of this scene are obviously clipped, but when HTP is turned on, these areas are restored to their true color, and a lot of detail is revealed which is lost to clipping in the original shot.
The same goes for raw files as well. These two raw files were converted in ACR with -2EV digital exposure compensation, and the 'brightness' value increased to achieve equivalent luminance in the sunlit brickwork to the left of the image (which is the nearest thing to a midtone in this shot). You can see that the raw file recorded with HTP turned on contains a lot more detail in the highlight areas, and a much truer color tone. The raw file created with HTP turned off looks washed out by comparison, and the color of the bright areas is inaccurate.
In simple terms, what this tells us is that where you'd normally expect around 1EV of extra dynamic range in the highlights in a raw file compared to a JPEG, turning HTP on will get you around 2EV of extra range (i.e. 1EV more than a simultaneously captured JPEG).
- 16 Photographic tests (DR)
- 17 Photographic tests (DR)
- 18 Resolution
- 19 Photographic tests
- 20 Movie Mode
- 21 Compared to
- 22 Compared to (JPEG)
- 23 Compared to (JPEG)
- 24 Compared to (JPEG)
- 25 Compared to (RAW)
- 26 Compared to (RAW)
- 27 Compared to (RAW)
- 28 Compared to (Higher ISO)
- 29 Conclusion
- 30 Samples
Oct 2, 2011
May 4, 2010
Feb 8, 2010
May 1, 2013
|Nectar Dancing by Lensmate|
from A Big Year - birds
|Foggy morning by LassiM|
|Sad clown by PEB|
|Mtl Gen X 2015 DP by MarioSS|
from - Gen X - (In Full Colours+ Border)
Lens manufacturer Voigtlander has introduced a 65mm F2 macro lens for Sony E-mount that it says "rates as one of the finest in the history of Voigtländer."
The UK released a preview of their upcoming drone safety regulations, and it looks like drone pilots will have to both register their device and pass safety awareness tests.
National Geographic photographer Bob Holmes talks about light, and why you need to learn how to 'see' and not just 'look' at your subject.
Photographer Alessandro Barteletti shares the story behind his National Geographic Italia cover, shot with a 10-year-old DSLR and an iPhone flashlight.
Fashion catalog photographers in China have some next-level models to work with. In this video, you see one model hitting 30 poses in 15 seconds as the photographer snaps away.
Photographer Paul Adshead breaks down 11 photography-related smartphone apps he couldn't live without—from a pocket light meter to a lighting diagram app.
Fast-growing Chinese flash brand Godox is teasing a brand new flash trigger... for smartphones. The Godox A1 is a 'phone flash system' that can act as both flash and 2.4GHz trigger.
On July 12, Canon opened its newest Technology and Support Center, designed to serve the motion picture industry, in Burbank, CA. DPReview got a sneak peak and takes you behind the scenes.
The Sigma 14mm F1.8 Art is truly one-of-a-kind. It offers the fastest aperture of any lens that shares its focal length, produces beautiful sunstars and is incredibly sharp to boot. If you're in the market for a fast ultrawide prime, this looks to be the one to get.
In this article, expert macro photographer Thomas Shahan shares advice for successful closeup photography of bugs, insects and small animals.
DJI's new firmware makes it difficult to fly in restricted airspace, even when you have proper clearance. Is DJI placing themselves between professionals and the FAA?
Go behind the scenes with National Geographic photographer Renan Ozturk and see what it takes to capture a dangerous, harrowing, stunning Nat Geo photo essay.
Erez Marom tells the story behind this ominous photo of the sand 'reaching up' towards the mountains at Skagsanden beach in Norway. He calls this photo 'Torment.'
DPReview staffer Carey Rose has taken the Panasonic Leica DG 15mm F1.7 along for everything from a city-side boat ride to a bachelor party across the mountains. Find out how the little Leica fared.
Canon just unveiled the largest 12-ink printer on the market. The new imagePROGRAF PRO-6000 printer can make prints from 17 all the way up to 60 inches wide.
"Standing in one of the holiest places on earth, I felt uneasy," writes Wired's Jason Parham. "Most of my fellow visitors, I realized with a brief bloom of nausea, were taking selfies."
Christopher Nolan's Dunkirk has been receiving great reviews, but it's a challenge to see it in its full glory. This handy infographic reveals the aspect ratio chaos that is wrought as the industry retreats from film.
Anti-bullying organization Ditch the Label's Annual Bullying Survey 2017 reveals yet again that Instagram, more so than any other social network, has the worst effect on youth mental health.
It's been a crazy day for innovative patent news. Apparently Sony is thinking of developing a medium format curved sensor camera.
An update to the Silkypix Raw converter fixes some bugs and adds support for several popular new cameras.
This crazy custom-built underwater camera shoots 8x10 large format film. It's supposedly "the first successful underwater 8x10 ever made," and it can be yours for $5,800... plus shipping.
Blackmagic just reveled a new accessory for their Cintel Film Scanner. The Cintel Audio and KeyKode Reader can capture KeyKode data and high-quality audio from film in real-time as it is being scanned.
A new Nikon patent shows a lens designed for a curved full-frame sensor. Could this be the high-end Nikon mirrorless camera people are hoping for?
The ability to shoot images at 1,000 fps first appeared in a Sony smartphone sensor. Now the Japanese manufacturer is using the same feature for industrial applications.
Astronomy expert and photographer Dr. Tyler Nordgren thinks you should "see your first eclipse, photograph your second." But if you do plan on taking photos this August, here are a few tips from someone who's been there.
How confident are you that you can spot a manipulated photo? A recent study at the University of Warwick shows that many people are pretty bad at it.
If you purchased a Leica TL2, do NOT attach Leica's Visoflex electronic viewfinder. Leica is working on a fix, but for now, it's possible the viewfinder will break your camera.
Google just released Motion Stills for Android. Unlike the iOS version, the Android app uses a redesigned video processing pipeline that processes each frame of a video as it is being recorded, creating instant results.
A huge copyright lawsuit between photography firm VHT and Zillow Group is heating up again, as both sides appeal a court ruling that granted VHT $4 million in damages.
European Space Agency astronaut Thomas Pesquet spent 6 months on board the International Space Station where he worked with Google capturing spheric panorama images that are now available in Street View.