Minolta DiMAGE 7 Review
Compared to... (contd.)
Colour Chart Comparison
Now we can compare the DiMAGE 7 to a few of other cameras. Using samples from our test archives, we will now compare its image quality to the Nikon Coolpix 995, Canon PowerShot G1 and Sony DSC-S85. I've thrown the 4 megapixel DSC-S85 in here as an 'upper end' expectation of resolution.
Colour charts are shot in daylight, Auto White Balance, EV compensation +0.3 (all cameras), measured light ~10 EV. This test is also dependent on the accuracy of the camera's auto white balance, the colour charts are shot in daylight but some camera's white balance is better than others. All cameras are given 20 seconds to "settle" before the shot is taken.
As per other samples in this review the DiMAGE 7 image has been converted to the sRGB colour space using the Minolta Image Viewer application [info].
|Minolta DiMAGE 7 (converted to sRGB)||Sony DSC-S85|
|Fujifilm FinePix 6900Z||Canon PowerShot G1|
In the table below we're only measuring colour. The RGB values were measured from a VGA reduced image (to average colours, remove noise and eliminate JPEG artifacts) using the Eyedropper tool in Photoshop with a 5 by 5 Average Sample Size.
Red Channel Noise
Something we noticed early on with the current crop of 3 megapixel cameras was a certain amount of noise in the red channel. This was most visible in the light blue of skies or painted walls. Our colour patch test chart turned out to be a good "leveller" and a way to measure the performance of one camera to the next.
The samples below are of 40 x 40 blocks cropped from the colour comparison charts above of the Blue and Cyan patches. Each block is then broken down into it's red green and blue channels and reflected as such directly below.
As you can see there is some 'mottle effect' in the red channel for what should be a pure dark blue patch, however it's no more than you can see from the Fujifilm 6900Z or Coolpix 995. The cyan (light blue) patch is noticeably 'clean' in the red channel producing a nice pure colour.
Shots here are of the PIMA/ISO 12233 standard resolution test chart (more of which are available in our comparison database). This resolution chart allows us to measure the actual performance of the lens and sensor system. It measures the ability of the camera to resolve lines at gradually higher resolutions and enables us to provide a definitive value for comparison purposes. Values on the chart are 1/100th lines per picture height. So a value of 8 equates to 800 lines per picture height.
NOTE: Here I've also added the Olympus E-10 as many people have been comparing the two cameras.
Studio light, cameras set to auto, all settings factory default. Exposure compensation +0.7 EV for all cameras.
|Minolta DiMAGE 7|
|Fujifilm FinePix 6900Z|
|Canon PowerShot G1|
Measurable findings (three measurements taken for each camera):
|Camera||Measurement||Absolute Res.||Extinction Res.|
|Minolta DiMAGE 7||Horiz LPH||*1300||1450|
|5o Diagonal LPH||900||n/a|
|Sony DSC-S85||Horiz LPH||1200||1650|
|5o Diagonal LPH||1000||n/a|
|Olympus E-10||Horiz LPH||1150||1450|
|5o Diagonal LPH||900||n/a|
|Fujifilm FinePix 6900Z||Horiz LPH||1150||1400|
|5o Diagonal LPH||900||n/a|
|Canon PowerShot G1||Horiz LPH||*950||1300|
|5o Diagonal LPH||*900||n/a|
* Moiré is visible
Definition of terms:
|LPH||Lines per Picture Height (to allow for different aspect ratios the measurement is the same for horizontal and vertical)|
|5o Diagonal||Lines set at 5o diagonal|
|Absolute Resolution||Still defined detail (below Nyquist frequency*)|
|Extinction Resolution||Detail beyond camera's definition (becomes a solid gray alias)|
|n/a||Not Available (above the capability of the test chart)|
|n/v||Not Visible (not visible on test results)|
image detail. Beyond the Nyquist frequency aliasing occurs.
Here we can see that the DiMAGE 7's 5 megapixel CCD does manage to eek out a little more resolution, but it's not really what we'd expect. Comparing these results to Sony's DSC-S85 it's clear to see that it's not that different in its ability to resolve absolute detail. That said the DiMAGE 7 clearly produces more resolution than last years 3 megapixel digital cameras.
More Minolta DiMAGE 7 / Sony DSC-S85 resolution chart crops
|Minolta DiMAGE 7||Sony DSC-S85|
Note: with the later production unit and newer firmware the quality we're getting from the resolution chart shot is considerably improved, however this still doesn't seem to me to be everything we could expect from five megapixels nor does it look particularly good against the 4 megapixel DSC-S85.
Nikon turns 100 years old today, and the company is celebrating with a wacky music video, some tributes to its history, and a new vision presented by president Kazuo Ushida.
Phottix just released the Premio Parabolic Umbrellas series, replacing their Para-Pro line with a stronger, deeper and better made set of parabolic umbrellas.
The Moto Z2 is Motorola's first dual-camera smartphone and, compared to its predecessor, comes with a number of improvements and new camera features.
Researchers at Stanford have revealed a new '4D camera system' built for robots. The system is based on the same light field tech that allowed Lytro cameras to refocus images after they were taken.
If you want 'beautiful rendition' from your lenses, follow this simple rule: only buy classic low-element prime lenses with lead glass elements—everything else is junk.
In an interview with CNBC, Leica Chairman Andreas Kaufmann said he dreams of a 'true Leica phone,' and hinted at what's next for the Leica and Huawei partnership.
Wildlife and nature photographer Peter Mather tells the story behind this exceptional shot of a mama grizzly and her cub searching for salmon in Yukon, Canada.
Popular YouTube channel TastyTuts has put together this 33-video Beginner's Guide to Adobe Photoshop—a godsend for anybody who wants to learn Photoshop from scratch.
The long anticipated replacement for the popular Rode VideoMic Pro is almost ready for shipping. The price of the upgraded VideoMic Pro+ will be £290/$300 when it goes on sale in mid-August.
A new iOS app called Explorest wants to help you find new locations to shoot. It's limited to Singapore for now, but the app is packed full of useful location scouting features.
Nikon's D850 development announcement is extremely light on details, so we assembled a wish list of upgrades and features we'd love to see.
Nikon has announced the development of the long-awaited replacement to its full-frame D810: the D850. Nikon says that the D850 will build on the strengths of its predecessor and offer 'new technologies, features and performance enhancements.'
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.