RSS
 

Posts Tagged ‘Perspective’

Adobe Photoshop Express update brings perspective correction and vignetting

08 May

The Android version of Adobe’s popular mobile image editing app, Photoshop Express, has just received an update expanding the feature set with a few useful new functions.

Perspective Correction lets you correct converging lines and other types of perspective distortion. You can select a Full Auto setting or pick vertical or horizontal skew. The correction is then applied and fine-tuned using a slider.

Some type of vignette effect is available on most editing apps out there, so it’s about time the feature has made its way to Photoshop Express too. You can adjust the diameter of the vignetting effect by pinch-zooming and set the intensity on a slider to create the final result.

Additionally, it’s now also possible to share multiple images directly from the gallery, and change wallpaper and profile pictures directly from the app’s share screen.

The new functions are welcome additions to the app’s already quite extensive feature set, making Adobe Photoshop Express worth a closer look for anyone who edits images on a mobile device. The latest version of the app can be downloaded free of charge from the Google Play Store now.

Articles: Digital Photography Review (dpreview.com)

 
Comments Off on Adobe Photoshop Express update brings perspective correction and vignetting

Posted in Uncategorized

 

Portrait mode perspective: the iPhone X versus the Canon M100

22 Jan
With all the latest photo-centric smartphones including a form of Portrait mode, are interchangeable lens cameras still coming out on top?

It’s safe to say that Portrait mode, the artificial blurry-background generator on modern smartphones, isn’t going anywhere. And now that it’s here, it’s only going to get better. It’s an incredibly handy feature to have, and for the vast majority of users, is easily good enough that they may rethink the need to purchase a so-called ‘real’ camera in the future.

But ‘good enough’ is a subjective assessment. So, we set up a tripod and grabbed an accessible entry-level camera that’s specifically aimed at smartphone users, and did our own informal comparison. It turns out, though, that things aren’t all that simple.

The first comparison

We found through our informal exercise that the iPhone X’s built-in Portrait mode on its default camera app appears to roughly approximate the blur from shooting a 35mm F2.8 lens on an APS-C camera. In this case, we used the Canon EOS M100.

iPhone X in Portrait mode Canon EOS M100 w/ EF-S 35mm F2.8 @ F2.8

Unfortunately, the tripod needed adjustment of an inch or two to make sure the iPhone image and the Canon image ended up a broadly similar positioning of the subject in the frame (there may be some distortion or other corrective effects at work that we don’t have full insight into).

For this comparison, the iPhone X had HDR enabled in Portrait mode, and the M100 image was processed through Adobe Camera Raw using an adapted EF-S Macro 35mm F2.8 lens.

Apple also includes ‘lighting modes,’ so let’s see if that makes a difference in your preference.

The second comparison

iPhone X in Portrait mode with Contour Light Canon EOS M100 w/ EF-S 35mm F2.8 @ F2.8

Here, we re-processed the iPhone’s image to use the ‘Contour Light’ option. It gives the iPhone’s image a much more ‘purposed’ look to the light, almost as if there is an umbrella off-camera left, instead of just a window, while the Canon image looks the same, because, well, it doesn’t have ‘portrait lighting’ modes.

The third comparison

iPhone X in Portrait mode, Focos app set to F1.4 iPhone X in Portrait mode, Focos app set to F20 Canon EOS M100 w/ EF-S 35mm F2.8 @ F2.8

Lastly, there’s a free app called ‘Focos’ that allows you further tweaks on images taken in Portrait mode. You can even specify the level of blur you want, measured in approximate f-number. Here, we see the two ends of the spectrum currently included in the app, from ‘F1.4’ to ‘F20.’

What’s the big deal?

We’re approaching a time of reckoning for traditional camera manufacturers. Not only are computational cameras getting better, but they’re increasingly in people’s pockets, at the ready whenever they’re needed.

There are, of course, aspects of traditional cameras that phones can’t replace; the form factor, the controls, the feel of the thing. But those are increasingly diminishing requirements for a broad range of photographers (especially since, as you well know, everyone these days is a photographer).

But to remain relevant, these sort of software ‘tricks’ are something that camera manufacturers are going to need to think more and more about. There may yet come a time when, finally, you don’t absolutely need a bigger sensor for better results. And it’s not necessarily a matter of ‘if,’ but a matter of ‘when.’

Articles: Digital Photography Review (dpreview.com)

 
Comments Off on Portrait mode perspective: the iPhone X versus the Canon M100

Posted in Uncategorized

 

Snapseed app updated with new interface and presets, adds perspective tool to iOS

20 Sep

Google has just pushed out an update to Snapseed, the popular mobile image editing app for iOS and Android. The update (version 2.18) is for both versions of the app, and offers users on both mobile platforms a new interface and 11 new image presets. Additionally, the iOS update has brought the app’s Perspective Tool to Apple’s mobile devices, enabling users to adjust the horizon and “skewed lines” using their iPhone or iPad.

The update was announced on the Google Plus Snapseed page, where the team explained that Snapseed 2.18 is redesigned to make accessing features more efficient while speeding up the overall editing process. The new interface, meanwhile, moves Looks to the main screen, a feature that enables users to save their favorite edits so they can be applied to multiple other photos quickly.

Other changes are minor, and include switching the app from a dark to a light theme, as well as making certain tools and the export function accessible in a menu at the bottom of the display while editing. Both the Android and iOS updates are available now through the Google Play and iTunes App Stores, respectively.

Articles: Digital Photography Review (dpreview.com)

 
Comments Off on Snapseed app updated with new interface and presets, adds perspective tool to iOS

Posted in Uncategorized

 

How to Use a Tilt-Shift Lens Creatively and for Perspective Control

14 Sep

When you hear tilt-shift lens or tilt-shift photography, there is a probability that an image looking like a miniature model crossed your mind. That is because, over the years, tilt-shift lenses have become synonymous with this style. The miniature look is interchangeably referred to as the tilt-shift effect and you can even recreate it in post-processing. These lenses though have quite a few other strengths that are worth considering.

tilt-shift lens - miniature effect

The miniature look that is affiliated with tilt-shift lenses.

So why use a tilt-shift lens?

The simple answer here is for perspective control. If you compare your regular lenses to a tilt-shift lens, you will notice they are built differently. The latter is designed to physically move (tilt, shift and rotate) independent of the camera and each other. This design feature gives you remarkable control over perspective and depth of field. In fact, a tilt-shift lens is also known as a perspective control lens.

How to Use a Tilt-Shift Lens Creatively and for Perspective Control

Left: Shot with the camera pointing up to capture the entire scene. Right: Lens shifted to minimize distortion.

Tilt Versus Shift

The tilt function gives you the ability to keep different elements of focus on different planes. Thus you can shoot two subjects at two different distances. With a regular lens if you want to shoot at a wide aperture, you usually have to make a focus choice of either the foreground or background. A tilt-shift lens allows you to have both your subjects in focus.

The shift function allows you to minimize distortion (common when using wide angle lenses) when you are shooting from a high or low angle. It also helps correct vertical line convergence (tilting buildings).

Tilt-Shift Lens Uses

Architecture

When photographing architecture, the shift function helps you maintain proper perspective. Ordinarily, when you want an entire building in your frame, you tilt your camera up. If you have ever tried this, you will be familiar with images where the buildings appear to be leaning backwards.

How to Use a Tilt-Shift Lens Creatively and for Perspective Control

Church shot at 24mm with a standard lens.

This skew is caused by the sensor plane of the camera being titled in relation to the building. Ideally, you want the sensor perpendicular to the ground and pointing straight ahead/centered. With a tilt-shift lens, instead of angling your camera upward, you “shift” the lens. Since the camera stays put and only the lens physically shifts, your building will be straight. This technique is very helpful when shooting interiors with high ceilings.

Church shot at 24mm with a tilt-shift lens.

Landscapes

In landscape photography, one of the primary uses of a tilt-shift lens is to minimize wide angle lens distortion. Another great way to use this lens is for panoramic shots. A common challenge with panoramas is after the shots are stitched together there is still some distortion to be corrected. When this distortion is corrected in post-production, you may lose part of your scene. By using the shift function of the lens, you can create high resolution distortion free panoramas with negligible post-processing work.

Creative uses of tilt-shift lenses

Miniatures

The tilt function of the lens is responsible for that miniature look you are likely familiar with. A miniature effect is when you take a life-sized scene and make it appear as if it’s on a miniature scale. The lens here is used to add blur to the photo which simulates shallow depth of field. This mimics the look you get when you use a macro lens to shoot a miniature scale model.

How to Use a Tilt-Shift Lens Creatively and for Perspective Control - miniature effect

The blur above and below creates a perception that your camera is only inches away from the scene.

To create this type of look, you need to be elevated at least 10 feet /3 meters (recommended higher if possible). Elevation gives you that same perspective as if you were looking down on a miniature model. So other than the subject, a high vantage point is key for these types of photos.

How to Use a Tilt-Shift Lens Creatively and for Perspective Control

The tilt function allows you to creatively add blur (in this image the blur is on the right side).

Note: Shooting wider gives you a better sense of place.

Portraits

Shooting portraits with a tilt-shift lens can be quite creative. At the very basic level, you are now able to capture in focus two subjects (or a group), even though they may be at different distances from the lens.

Another creative use is capturing someone walking towards or away from you. As you know, a moving person can quickly be out of focus. But with a tilt-shift lens, you have the ability to extend your plane of focus to the front and back of your walking subject so they stay sharp even at different distances.

Bonus: The Scheimpflug Principle

The Scheimpflug Principle is where more of your subject plane is in focus (from near to far) and refers to what looks like a near-infinite depth of field. To achieve this great “depth of field”, you tilt the plane of focus in the same direction as the plane of the subject – which puts the image in focus at various points along the subject plane.

By Fil Hunter at English Wikipedia – Transferred from en.wikipedia to Commons by Jacopo Werther., Public Domain

For example, if you are shooting a field of flowers going off into the distance and you want to have all of the flowers in focus. Shooting at a small aperture will work, but may (based on your lighting) increase your shutter speed – which reduces your chance of sharp flowers. By changing the plane of focus, your tilt-shift lens allows you to shoot at a wider aperture and still get all your flowers in focus.

Conclusion

The perspective control that tilt-shift lenses offer will save you a lot of time in post-processing and is also a great way to correct for depth of field limitations of most lenses. These lenses also give you a lot of depth without the need to use smaller apertures. So besides straightening tall buildings, what have you used, or hope to use tilt-shift lenses for?

Here are some other creative ideas for you. Please share your tilt-shift images in the comments below.

The post How to Use a Tilt-Shift Lens Creatively and for Perspective Control by Nisha Ramroop appeared first on Digital Photography School.


Digital Photography School

 
Comments Off on How to Use a Tilt-Shift Lens Creatively and for Perspective Control

Posted in Photography

 

NVIDIA Computational Zoom lets you change perspective and focal length in post

03 Aug

Researchers with the University of California, Santa Barbara (UCSB) and NVIDIA have detailed a new type of technology called ‘computational zoom’ that can be used to adjust the focal length and perspective of an image after it has been taken. The technology was detailed in a recently published technical paper, as well as a video (above) that shows the tech in action. With it, photographers are able to tweak an image’s composition during post-processing.

According to UCSB, computational zoom technology can, at times, allow for the creation of ‘novel image compositions’ that can’t be captured using a physical camera. One example is the generation of multi-perspective images featuring elements from photos taken using a telephoto lens and a wide-angle lens.

To utilize the technology, photographers must take what the researchers call a ‘stack’ of images, where each image is taken slightly closer to the subject while the focal length remains unchanged. The combination of an algorithm and the computational zoom system then determines the camera’s orientation and position based on the image stack, followed by the creation of a 3D rendition of the scene with multiple views.

“Finally,” UCSB researchers explain, “all of this information is used to synthesize multi-perspective images which have novel compositions through a user interface.”

The end result is the ability to change an image’s composition in real time using the software, bringing a photo’s background seemingly closer to the subject or moving it further away, as well as tweaking the perspective at which it is viewed. Computational zoom technology may make its way into commercial image editing software, according to UCSB, which says the team hopes to make it available to photographers in the form of software plug-ins.

Articles: Digital Photography Review (dpreview.com)

 
Comments Off on NVIDIA Computational Zoom lets you change perspective and focal length in post

Posted in Uncategorized

 

NASA puts it all in perspective with this image of Earth between Saturn’s rings

22 Apr
Earth, photographed from 1.4 billion kilometers / 870 million miles away. Photo: NASA/JPL-Caltech/Space Science Institute

NASA’s Cassini spacecraft will soon meet its demise in Saturn’s atmosphere, but one of its last photos of Earth is making for a heck of a swan song. The image, dated April 12, 2017, shows Earth as a bright white dot framed by the planet’s rings. For comparison, it’s about the same size as your standard speck of dust. Our entire planet.

Cassini has been orbiting Saturn since 2004 and has spent the last decade and then some beaming back information about the ringed planet and its moons. But all good things must come to an end, and as the spacecraft’s fuel supply runs low, NASA will begin the process of safely putting it out to pasture.

Articles: Digital Photography Review (dpreview.com)

 
Comments Off on NASA puts it all in perspective with this image of Earth between Saturn’s rings

Posted in Uncategorized

 

Vanishing Points: Simple Architectural Drawing Hack Puts Art in Perspective

05 Jan

[ By WebUrbanist in Art & Drawing & Digital. ]

trickshot

Architectural drawings have long used geometrical tricks to convey scale, depth, distance and other three-dimensional aspects of realities on two-dimensional surfaces. In a two-vanishing-point drawing, the artist aligns their ruler with a point on one side or the other and draws a line along the edge (or employs another modular straight-edging tool).

drawing-hack

The same came be accomplished much more quickly, however, using this simple technique: pin a flexible string to both points along the horizon line and slide a hook along the center. The results will naturally be a bit less than precisely linear, but for many architectural artists a wavy line is typical or even desired (it gives the piece a less rigorously complete look).

four-point-perspective

Of course, it will only work for a traditional two-point perspective – in cases where the artist wants to include a third vanishing point (for instance, to emphasize verticals in looking up at a skyscraper or create a fish-eye effect) a straight-edge is still required. That, or a free-handed approach based on a picture, presumably the basis of the drawing above.

Share on Facebook





[ By WebUrbanist in Art & Drawing & Digital. ]

[ WebUrbanist | Archives | Galleries | Privacy | TOS ]


WebUrbanist

 
Comments Off on Vanishing Points: Simple Architectural Drawing Hack Puts Art in Perspective

Posted in Creativity

 

Earth from a New Perspective: ‘Overview’ Aerial Shots Reveal Hidden Beauty

01 Nov

[ By SA Rogers in Art & Photography & Video. ]

Planned community of Sun Lakes, Arizona

Other than a few brief glimpses near airports, few of us ever get to see the Earth from high up in the sky, taking in all of the complex textures and patterns created by nature and human activity. If we could, we might feel more inclined to do all that we could to protect it. This phenomenon, as experienced by astronauts when viewing our small, fragile planet from space, is called the ‘overview effect,’ and it serves as the inspiration behind a series of stunning aerial photographs by Benjamin Grant.

Tulip fields, Lisse, Netherlands
Tulip fields, Lisse, Netherlands
A highway interchange in Jacksonville, FL
A highway interchange in Jacksonville, FL
World's largest aircraft storage facility, Tucson, Arizona
World’s largest aircraft storage facility, Tucson, Arizona
Residential communities in Boca Raton, FL
Residential communities in Boca Raton, FL

‘Overview: A New Perspective of Earth’ is a new hardcover book full of over 200 aerial images taken of sites all over the world, from industrial areas of South Korea and fields in Ethiopia to planned communities in South Florida. Grant initially started the project as an Instagram series in December 2013, selecting high-resolution satellite photographs that reveal the extent to which we have altered the surface of the planet upon which we live and curating them into a thoughtful, emotional collection.

Port of Singapore
Port of Singapore
Industrial district, Ansan, South Korea
Industrial district, Ansan, South Korea
Agricultural development, Addis Ababa, Ethiopia
Agricultural development, Addis Ababa, Ethiopia
Residential neighborhood in Delray Beach, FL
Residential neighborhood in Delray Beach, FL

“What I’m really trying to get across here is that we’ve entered an important time in human history where our home has been significantly altered,” Grant told Wired in a 2015 interview.

The Gemasolar Thermosolar Plant, Seville, Spain
The Gemasolar Thermosolar Plant, Seville, Spain
Olive tree groves in Cordoba, Spain
Olive tree groves in Cordoba, Spain
Mexico City
Mexico City
Burning Man, Black Rock, Nevada
Burning Man, Black Rock, Nevada

Grant searches aerial shots relating to a specific current event or environmental issue to find the ones that have the biggest impact, striking us as visually beautiful even when the imagery depicts tragedy. Some examples include shots of a refugee camp in Kenya, shrinking ice sheets and the choked streets of the world’s most populated cities. Take a look through the feed on DailyOverview.com, or order the book on Amazon.

Share on Facebook





[ By SA Rogers in Art & Photography & Video. ]

[ WebUrbanist | Archives | Galleries | Privacy | TOS ]


WebUrbanist

 
Comments Off on Earth from a New Perspective: ‘Overview’ Aerial Shots Reveal Hidden Beauty

Posted in Creativity

 

New technology alters perspective in selfies, generates 3D images, and more

31 Jul

A team of researchers from Princeton University and Adobe Research have detailed a new project in which they use a 3D computer model of a head and a virtual ‘full perspective’ camera to manipulate the perspective of a single portrait. The manipulations simulate various shooting distances and the warps typically seen at those depths, potentially allowing software adjustments that create selfies with corrected perspective distortion.

A demo system (currently in beta) on lead researcher Ohad Fried’s website allows you to upload your own images to explore the technology.

The front-facing lenses found in smartphones cameras are often wide-angle, fixed focal length, to make them as flexible as possible, but the close-up nature of selfies tends to show distortions such as large noses or sloping foreheads. Interestingly, these distortions can change how the individuals are perceived; the subjects in portraits taken at close distances are often described in ways that include ‘approachable’ and ‘peaceful’ while subjects in portraits taken at longer distances are more often described as ‘smart,’ ‘strong,’ and ‘attractive.’

While it might be beneficial to take selfies at longer distances and longer focal lengths to eliminate the distortion, there is no practical way to do so with present phone technology. This newly developed technology could change that, however, with the researchers explaining: ‘our framework allows one to simulate a distant camera when the original shot was a selfie, and vice versa, in order to achieve various artistic goals.’

The researchers based their method on existing approaches to manipulating images, including the type of technology used in face-swapping apps. The key difference was using a ‘full perspective’ virtual camera model rather than a more simplistic, ‘weak perspective’ model, enabling them to compensate for the wider range of perspective adjustments needed for portraits taken at very close distances. This new method is able to estimate the camera distance and edit the perceived camera distance. Its modeling of depth also allows slight changes in the position of the virtual camera, allowing the photos to be slightly ‘re-posed’.

The technology promises than just correcting selfie perspective. The ability to slightly correct perspective and map facial features to a 3D model allows the creation of stereo pairs of images (3D anaglyphs) from a single image, or could make it possible to animate changes in facial expressions.

Articles: Digital Photography Review (dpreview.com)

 
Comments Off on New technology alters perspective in selfies, generates 3D images, and more

Posted in Uncategorized

 

Calligraffiti: Fresh Artistic Perspective on Cairo’s ‘Garbage City’

01 Jul

[ By WebUrbanist in Art & Street Art & Graffiti. ]

giant mural cairo

On the outskirts of Cairo, Egypt, lies the community of Manshiyat Naser, famous for providing informal trash and recycling services for the city, but also notorious for the mess and smell that go with that role.

garbage city mural

‘Calligraffiti’ artist el Seed worked with the ward to develop an incredible mural spanning 50 buildings, aiming to change perceptions and raise awareness about the community.

garbage city calligraffiti

Marginalized and belittled, the residents are incredibly industrious, sorting out garbage from recyclables by district within the community, literally turning Cairo’s trash into lucrative treasure.

graffiti on walls

hanging to paint

The mural blends aspects of Arabic calligraphy with contemporary graffiti, all while highlighting the architecture of the area. The entire work is only visible from the nearby Mokattam Mountain.

graffiti progress

The piece spells out the words of Saint Athanasius of Alexandria, a Coptic bishop from the 3rd Century, who said: “anyone who wants to see the sunlight clearly needs to wipe his eye first.”

graffit art close up

“The zaraeeb community welcomed my team and I as if we were family,” said the artist. “It was one of the most amazing human experiences I have ever had. they are generous, honest and strong people. They have been given the name of Zabaleen (the Garbage People), but this is not how they call themselves. They don’t live in the garbage but from the garbage; and not their garbage, but the garbage of the whole city. they are the ones who clean the city of Cairo.”

Share on Facebook





[ By WebUrbanist in Art & Street Art & Graffiti. ]

[ WebUrbanist | Archives | Galleries | Privacy | TOS ]


WebUrbanist

 
Comments Off on Calligraffiti: Fresh Artistic Perspective on Cairo’s ‘Garbage City’

Posted in Creativity