DxO Labs suggests shortcomings of Adobe's Lens Profile Creator
Adobe's image processing rival DxO Labs has highlighted potential pitfalls in allowing users to profile their own lenses using Adobe's recently announced Lens Profile Creator utility. The company has expressed concerns about the accuracy and number of measurements taken to achieve an accurate profile. In response, Adobe has explained the reasoning behind encouraging users to profile their own lenses and says it has tried to mitigate the potential errors.
'We do not know how Adobe generates its own profiles, but the documentation and the tools provided by Adobe for users to generate their own profiles raises some issues on distortion and vignetting.' says Cyrille de La Chesnais, Sales and Marketing Director - Photography at DxO Labs. 'Distortion estimation requires a perfectly flat target (or a very precise process),' he explains: 'a 1% target curvature yields strongly visible distortions on a wide angle camera.' Correct illumination is also important, he stresses: 'Light uniformity is key for vignetting estimation: all engineers know the difficulty of achieving less than 10% light non-uniformity using only two light sources, as suggested by Adobe.'
DxO Labs conducts its own tests to create its profiles, he explains: 'DxO profiles (called Lens Modules) are created from shots taken in a very controlled environment with no wall reflections, calibrated lighting equipment and glass targets to ensure flatness.' To check the effect, the company tested the Adobe utility using the provided instructions and concluded that it 'clearly under-corrects distortion and vignetting in some situations.'
In addition to concerns about the dependability of home-testing, he also highlights the amount of work involved in profiling the behavior across its zoom, aperture and focusing range: 'typically for a wide range zoom, we may use dozens of different focal lengths, dozens of focusing distances, dozens of apertures, etc. This generates a lot of configurations to be calibrated and verified. We of course do not know which sampling policy has been used for profiles generated by Adobe but from the documentation, we understand that Adobe recommends users to sample just three focal lengths, three focusing distances and four apertures to generate 'advanced' profiles.'
He also mentions that DxO Lens Modules do more than correcting the geometric distortion, vignetting and chromatic aberration addressed by Adobe, also aiming to resolve volume anamorphosis and uneven sharpness.
Adobe responds that it has designed its system to mitigate the potential errors. It's all about photographer empowerment say Adobe senior product manager Tom Hogarty and the Camera Raw team.
'The photographer can decide the accuracy level of the calibration they want to achieve utilizing the Adobe Lens Profile Creator. By empowering photographers they can put as much or as little into their profile creation as they feel is necessary for their workflow. An advantage of Adobe’s lens calibration setup,' they say: 'is that it does not require a strict studio setup to achieve good results.'
'For vignette estimation, Adobe’s method does not require the calibration target to be uniformly lit, it just requires the lighting to be constant from one shot to the other. The utility applies advanced math to eliminate the uniformity requirement, thus allowing accessibility of the technology to a wider audience, allowing regular photographers to calibrate their own lens with their own camera.
'Photoshop, Lightroom and Camera Raw also have advanced lens profile interpolation and retargeting systems, which enable us to provide high-quality results even with a few samples and map profiles created with a larger sensor to images shot on a smaller sensor.'
Adobe also points put that the its current setup for sharing profiles is based a rating system that enables users to search, preview and download the lens profile that is compatible their target image. Based on the feedback the company will aim to improve the sharing features further.
Commenting on the profiles that are currently being shipped with the software itself Hogarty and the team explain: "the lens profile creation process is taken quite seriously by Adobe and, in the case of Sigma, we were able to work directly with the lens manufacturer with the goal of achieving the highest possible quality in lens characterization."
May 17, 2013
May 15, 2013
May 8, 2013
May 8, 2013
|Devil Rock (Stuttgart, Germany) by cornissimo|
from Neon Signs
|Carla... by lickity split|
from Beautiful caucasian female faces
|Lunar New Year Fireworks by Michael L NYC 99|
|Vatican Basilica by wam7|
from Street lights
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 a 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.
It's official. PDN has confirmed with parent company Aurelius that 94-year-old lighting company Bowens is indeed going out of business.
The newly launched firmware version 1.06 fixes AF-issues that can occur with some lenses that are not officially compatible with the MC-11 converter.
Voyager is a waterproof smart light stick you can control entirely from your phone. The light has already blown past its $300K funding goal on Indiegogo.
2018 is the last year Photokina will take place during the traditional end-of-September dates. In 2019, Photokina will take place from the 8th to the 11th of May.
The Canon IXUS 50 (known as the SD400 Digital ELPH in North America) was one of a string of high-performing, pocketable PowerShots of the mid-2000s. In this week's throwback Thursday, Barney casts his mind back to 2005.
A close look at the EOS 6D II's Raw files suggest its dynamic range has taken a significant step backwards compared with the company's recent DSLRs. We look at how much difference this might make for your photos.
With a full-production review unit in our hands, we've got over 100 production samples from the new Canon EOS 6D Mark II to share.
Need a break from your day? Kick back and watch the making of a somewhat unconventional mojito filmed on Canon's new EOS 6D Mark II.
The Bonfoton Camera Obscura Room Lens can turn any room into a camera obscura, projecting the view from your window onto the walls of your room.
Adobe just released version 2015.12 of Lightroom CC, adding support for several new cameras and lenses, and baking in several important bug fixes while they were at it.
In this interview, Chiara Marinai, photo editor for VanityFair.com, explains exactly what she looks for in new photographers and photo submissions. Take notes.
Massive corporation P&G is being sued by a Cincinnati photographer for serious copyright violations. If the courts rules against P&G, the company could pay as much as $75 million in damages.
Snapchat's camera-equipped 'Spectacles' aren't so difficult to get anymore. You can now pick up a pair through Amazon for $130.