In contrast, developing an exposed film transforms it irreversibly; thus, development cannot be repeated. If the film is negative, the printing process must invert the image to a positive result.

Android Lollipop 5.0, introduced in late 2014, can allow smartphones to take 10-bit and 16-bit raw images, useful in low-light situations.[55] 12-bit RAW was introduced in API Level 23 (Android 6.0).[56]

Liquidcrystallens

In April 2005, Apple's OS X 10.4 brought raw support to the operating system's ImageIO framework, enabling raw support automatically in the majority of macOS applications both from Apple (such as Preview, macOS's PDF and image viewing application, and Aperture, a photo post-production software package for professionals) as well as all third party applications which make use of the ImageIO frameworks.

The Edmund Optics M12, for example, is a lens recommended for use in production systems that require high-speed machine vision. This includes assembly lines, where objects of different sizes are inspected as they roll out of the plant. With all refocusing controlled by the liquid lens, the M12 is able to rapidly adjust to items as they pass beneath the sensor.

How Xiaomi’s approach compares isn’t yet clear: we haven’t been able to get hands-on with the China-only handset. Theory suggests a physical motor will be slower than a focus system which uses electrical current alone, but the liquid core will still deliver new focal length flexibility.

Providing a detailed and concise description of the content of raw files is highly problematic. There is no single raw format; formats can be similar or radically different. Different manufacturers use their own proprietary and typically undocumented formats, which are collectively known as raw format. Often they also change the format from one camera model to the next. Several major camera manufacturers, including Nikon, Canon and Sony, encrypt portions of the file in an attempt to prevent third-party tools from accessing them.[15]

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The following products were launched as raw processing software to process a wide range of raw files, and have this as their main purpose:

When converting from the four-sensor 2x2 Bayer-matrix raw form into RGB pixels, each pixel only contains partial colour data and so the remaining colour data is interpolated from the surrounding pixels. There are several algorithms used to achieve this. Simple algorithms such as linear interpolation result in colour artifacts and blurring.

One variation on the Bayer filter is the RGBE filter of the Sony Cyber-shot DSC-F828, which exchanged the green in the RG rows with "emerald"[6] (a blue-green[7] or cyan[8] color). Other sensors, such as the Foveon X3 sensor, capture information directly in RGB form (using three pixel sensors in each location). This RGB raw data still needs to be processed to make an image file, because the raw RGB values correspond to the responses of the sensors, not to a standard color space like sRGB. As there is no color filter array, there is no need for demosaicing.

Focus speed is just one aspect of a camera’s performance. Even with near-instant focal length adjustments on offer, pro photographers will still want the low-light skills and outright image quality offered by bigger sensors. That poses a problem: according to Edmund Optics, the largest liquid lens aperture is currently 16mm, which means it’s only suitable for use with sensors up to 1/1.8in.

In general terms, when a camera’s electric focus motor fires – or you manually twist the tube – the physical distance between those optical components changes. This in turn changes the focal length, bringing the image into focus on the sensor or, in the case of a zoom lens, altering the field of view – from wide-angle to telephoto.

Thanks to their durability, tiny size and rapid reaction times, liquid lenses have been seen in industrial settings for several years.

The liquid lens concept has been implemented in several ways, with different methods employed to exert pressure on the capsule. But the magic almost always happens when electricity is added.

In digital photography, the raw file plays the role that photographic film plays in film photography. Raw files thus contain the full dynamic range (typically 12- or 14-bit) data as read out from each of the camera's image sensor pixels.

Current limitations mean larger liquid lenses are likely a long way off. But they’re already available in a form which fits most mobiles. Paired with the most powerful sensors yet seen in smartphones, the versatility of liquid lenses could revolutionize pocket photography – and sound the final death knell for compact cameras.

This industry-wide situation of inconsistent formatting has concerned many photographers who worry that their valuable raw photos may someday become inaccessible, as computer operating systems and software programs become obsolete and abandoned raw formats are dropped from new software. The availability of high-quality open source software which decodes raw image formats, particularly dcraw, has helped to alleviate these concerns. An essay by Michael Reichmann and Juergen Specht stated "here are two solutions – the adoption by the camera industry of A: Public documentation of RAW formats; past, present and future, or, more likely B: Adoption of a universal RAW format".[16][17][18] "Planning for [US] Library of Congress Collections" identifies generic raw-file formats as "less desirable file formats", and identifies DNG as a suggested alternative.[19]

Tunablelens

Imagine a water droplet on a leaf – the kind you often see captured on the pages of photography magazines. Just as this bead can refract natural light, so too can the fluid in a liquid lens guide light onto an imaging sensor.

Semi-regular updates to macOS generally include updated support for new raw formats introduced in the intervening months by camera manufacturers.

DNG, the Adobe digital negative format, is an extension of the TIFF 6.0 format and is compatible with TIFF/EP, and uses various open formats and/or standards, including Exif metadata, XMP metadata, IPTC metadata, CIE XYZ coordinates, ICC profiles, and JPEG.[5]

Tubelens

Panasonic's raw converter corrects geometric distortion and chromatic aberration on such cameras as the LX3,[9][10][11] with necessary correction information presumably included in the raw.[12] Phase One's raw converter Capture One also offers corrections for geometrical distortion, chromatic aberration, purple fringing and keystone correction emulating the shift capability of tilt-shift in software and specially designed hardware, on most raw files from over 100 different cameras.[13][14] The same holds for Canon's DPP application, at least for all more expensive cameras like all EOS DSLRs and the G series of compact cameras. To obtain an image from a raw file, this mosaic of data must be converted into standard RGB form. This is often referred to as "raw development".

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Because most liquid lenses don’t use electric motors, they can normally focus far more rapidly than their mechanical cousins. The optical liquid inside reacts almost instantaneously to electrical current, which results in super-fast focus performance, plus pinpoint accuracy. The option to switch focal lengths in mere milliseconds could open up a world of possibilities for multi-talented photographers, too. Spotted a rare bird in the distance while shooting a flower in macro? No problem.

A camera raw image file contains unprocessed or minimally processed data from the image sensor of either a digital camera, a motion picture film scanner, or other image scanner.[1][2] Raw files are so named because they are not yet processed, and contain large amounts of potentially redundant data. Normally, the image is processed by a raw converter, in a wide-gamut internal color space where precise adjustments can be made before conversion to a viewable file format such as JPEG or PNG for storage, printing, or further manipulation. There are dozens of raw formats in use by different manufacturers of digital image capture equipment.

In addition to those listed under operating system support, above, the commercial software described below support raw formats.

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Like a standard smartphone lens, the physical aperture of a liquid lens doesn’t change. But liquid lenses offer a spectrum of focal lengths. Those two facts together should mean greater depth of field flexibility for mobile photographers, as well as improved low-light performance – aided by the low dispersion and high transmittance of light through the optical fluid.

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Other solutions deploy alternative approaches to achieve the same result. Optotune’s focus-tunable lenses, for example, seal the optical liquid in a polymer membrane sac, which is then manipulated using electrical current.

Microsoft as of 2019 supplies the free Raw Image Extension for Windows 10 and later versions of Microsoft Windows, to integrate raw file viewing and printing into some Microsoft Windows tools.[50] The Extension allows native viewing of raw files from many mid- to high-end digital cameras in Windows Explorer / File Explorer and Microsoft Photos.

Traditionally, the course of light through a camera lens is controlled by a series of polished optical elements. These curved discs – usually made from glass or perspex – are used to ‘bend’ light as it passes down the barrel. With the correct spacing between lens elements and the sensor, an image should arrive at a single fixed point, sharp and in focus.

Once the potential for liquid lenses is proven, though, it’s not far-fetched to suggest we may see a return to single lenses on future smartphones. If a single snapper is capable of switching quickly between focal lengths, zooming optically and resisting vibrations, why add more?

In 2016, Apple announced that iOS 10 would allow capturing raw images on selected hardware, and third party applications will be able to edit raw images through the operating system's Core Image framework.[44]

Just like prime lenses, most standard smartphone cameras feature a fixed focal length, thanks to their static optical elements. It’s rare to see genuine optical zoom on a smartphone, because it requires separation of these elements; even at microscopic levels, this is difficult to achieve within the slimline confines of modern mobile design. And that’s where liquid lenses come in.

Deep optics

Nearly all digital cameras can process the image from the sensor into a JPEG file using settings for white balance, color saturation, contrast, and sharpness that are either selected automatically or entered by the photographer before taking the picture. Cameras that produce raw files save these settings in the file, but defer the processing. This results in an extra step for the photographer, so raw is normally only used when additional computer processing is intended. However, raw has numerous advantages over JPEG such as:

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Many raw file formats, including IIQ (Phase One), 3FR (Hasselblad), DCR, K25, KDC (Kodak), CRW, CR2, CR3 (Canon), ERF (Epson), MEF (Mamiya), MOS (Leaf), NEF NRW (Nikon), ORF (Olympus), PEF (Pentax), RW2 (Panasonic) and ARW, SRF, SR2 (Sony), are based on TIFF, the Tag Image File Format.[4] These files may deviate from the TIFF standard in a number of ways, including the use of a non-standard file header, the inclusion of additional image tags and the encryption of some of the tag data.

Raw image formats are intended to capture the radiometric characteristics of the scene, that is, physical information about the light intensity and color of the scene, at the best of the camera sensor's performance.[3] Most raw image file formats store information sensed according to the geometry of the sensor's individual photo-receptive elements (sometimes called pixels) rather than points in the expected final image: sensors with hexagonal element displacement, for example, record information for each of their hexagonally-displaced cells, which a decoding software will eventually transform into the rectangular geometry during "digital developing".

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Raw files contain the information required to produce a viewable image from the camera's sensor data. The structure of raw files often follows a common pattern:

To be viewed or printed, the output from a camera's image sensor has to be processed, that is, converted to a photographic rendering of the scene, and then stored in a standard raster graphics format such as JPEG. This processing, whether done in-camera or later in a raw-file converter, involves a number of operations, typically including:[30][31]

As above, Xiaomi’s system uses a high-precision electric motor to alter the capsule’s shape. At the time of writing, it’s the sole smartphone with a liquid lens – and it’s currently only available in China.

Like undeveloped photographic film, a raw digital image may have a wider dynamic range or color gamut than the developed film or print. Unlike physical film after development, the Raw file preserves the information captured at the time of exposure. The purpose of raw image formats is to save, with minimum loss of information, data obtained from the sensor.

Microsoft Windows supports the Windows Imaging Component (WIC) codec standard. WIC was available as a stand-alone downloadable program for Windows XP Service Pack 2, and built into Windows XP Service Pack 3, Windows Vista, and later versions. Windows Explorer / File Explorer, and Windows Live Photo Gallery / Windows Photo Gallery can view raw formats for which the necessary WIC codecs are installed. Canon, Nikon, Sony, Olympus and Pentax have released WIC codecs for their cameras, although some manufactures only provide codec support for the 32-bit versions of Microsoft Windows.[51]

Lenses and liquids are generally best kept separate, yet the future of photography could lie in combining the two with, you guessed it, liquid lenses.

Optotune

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Most liquid lenses use no mechanical components. Instead, they contain a transparent fluid capsule. By applying pressure to part of this pod, its shape can be manipulated. Squashing or stretching it alters the trajectory of light passing through the optical-grade fluid – and therefore the focal length.

When a camera saves a raw file it defers most of this processing; typically the only processing performed is the removal of defective pixels (the DNG specification requires that defective pixels be removed before creating the file[36]). Some camera manufacturers do additional processing before saving raw files; for example, Nikon has been criticized by astrophotographers for applying noise reduction before saving the raw file.[37]

Not so with liquid lenses: they use a small pocket of fluid instead of physical discs, changing shape to direct and focus light. They’re small, super-fast and sturdy, too. And they could change the world of smartphone photography.

Cameras that support raw files typically come with proprietary software for conversion of their raw image data into standard RGB images. Other processing and conversion programs and plugins are available from vendors that have either licensed the technology from the camera manufacturer or reverse-engineered the particular raw format and provided their own processing algorithms.

But it seems highly likely that liquid lenses will be deployed more widely in the smartphone market. If its patent filings are to be believed, Huawei already has plans to deploy the tech. Many predicted it would appear on the new Huawei P50 Pro powerhouse. It didn’t – but a liquid lens could yet show up on the P50 Pro+, which is rumored for launch later this year.

As any owner of a DSLR or mirrorless camera will know, no single lens is fit for every situation. Some can cover fairly large zoom ranges, but they have to be sizable simply because of the space required to fit the optical elements inside. And if a lens doesn’t cover the focal length appropriate for a given scene, you’ll need to switch to different glass – as long as you have some stashed in your camera bag.

Liquid lensedmund optics

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Xiaomi’s liquid lens tech, seen for the first time on the Xiaomi Mi Mix Fold (see above), takes a third route. The refractive fluid is contained in a film membrane, with a precision electric motor accurately deforming its radius to adjust focal length. The result is a single lens with a minimum focus distance of 3cm for macro shots and an optical zoom range of 3x – expanding to 30x with the help of some in-device digital trickery.

Perhaps understandably for an experimental imaging system, Xiaomi included standard cameras alongside the liquid lens on its Mi Mix Fold. Many manufacturers are likely to follow suit: in a smartphone market where multiple lenses are the norm, there’s a good chance you’ll see brands adding liquid lenses as one of many on their mobiles – at least until they understand the true capabilities of the technology.

One technique – known as ‘electrowetting’ – pairs water with a separate layer of non-conductive oil, which sit together in the lens. By applying voltage across the boundary between the two, the curvature – and so the refractive effect – can be altered in a fraction of a second. Corning’s Varioptic lenses use this technology.

Mit der Brennweite einer Überwachungskamera ist die Distanz zwischen Objektiv und Bildsensor gemeint.

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In 2020, Apple released the iPhone 12 Pro and iPhone 12 Pro Max. Both of these devices support Apple ProRAW (as of iOS 16.0.3) output and viewing. The later Pro and Pro Max models also provide ProRAW output.[45] Two raw options are in fact available for capture: a traditional "Bayer RAW" and Apple's "ProRAW" both in 12-bit DNG.[46] The ProRAW option is demosaiced and partially processed. It can be used with HDR, Deep Fusion, or Night mode, which is not possible with Bayer RAW. The data inside remain scene-referred like "true" RAW images.[47]

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Some raw formats also allow nonlinear quantization.[38][39] This nonlinearity allows the compression of the raw data without visible degradation of the image by removing invisible and irrelevant information from the image. Although noise is discarded this has nothing to do with (visible) noise reduction.[citation needed]

Microsoft supplies the free Windows Camera Codec Pack for Windows XP and later versions of Microsoft Windows, to integrate raw file viewing and printing into some Microsoft Windows tools.[48] The codecs allow native viewing of raw files from a variety of specific cameras in Windows Explorer / File Explorer and Windows Live Photo Gallery / Windows Photo Gallery, in Windows Vista and Windows 7.[49] As of October 2016, Microsoft had not released an updated version since April 2014, which supported some specific cameras by the following manufacturers: Canon, Casio, Epson, Fujifilm, Kodak, Konica Minolta, Leica, Nikon, Olympus, Panasonic, Pentax, Samsung, and Sony. For windows 10 this was essentially replaced in 2019 by Microsoft Raw Image Extension.[49]

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While their size makes liquid lenses ideal for use in smartphones, it’s trickier to leverage the technology for larger camera formats.

Commercial DNG WIC codecs are also available from Ardfry Imaging,[52] and others; and FastPictureViewer Professional installs a set of WIC-enabled image decoders.[53][54]

While that’s fine for the sensors found in most compact cameras, it doesn’t come close to covering Micro Four Thirds or APS-C sensor sizes. Until the technology grows, liquid lenses are unlikely to replace traditional interchangeable glass. So it’s worth hanging onto your camera bag for the time being.

Their tiny dimensions make them ideal for use on smartphones. So, too, does the ability to switch quickly between focal lengths, which could put an end to the multiple lenses now sprouting up on the back of smartphones. And if liquid tech can be integrated into the larger lenses used by DSLR and mirrorless cameras, your arsenal of bulky barrels could potentially be replaced by a single fluid solution.

Flatbed and film scanner sensors are typically straight narrow RGB or RGBI (where "I" stands for the additional infrared channel for automatic dust removal) strips that are swept across an image. The HDRi raw data format is able to store the infrared raw data, which can be used for infrared cleaning, as an additional 16-bit channel. The remainder of the discussion about raw files applies to them as well. Some scanners do not allow the host system access to the raw data at all, as a speed compromise. The raw data are processed very rapidly inside the scanner to select out the best part of the available dynamic range so only the result is passed to the computer for permanent storage, reducing the amount of data transferred and therefore the bandwidth requirement for any given speed of image throughput.[citation needed]

The camera's sensor is almost invariably overlaid with a color filter array (CFA), usually a Bayer filter, consisting of a mosaic of a 2x2 matrix of red, green, blue and (second) green filters.

If raw format data is available, it can be used in high-dynamic-range imaging conversion, as a simpler alternative to the multi-exposure HDI approach of capturing three separate images, one underexposed, one correct and one overexposed, and "overlaying" one on top of the other.

Raw image files are sometimes incorrectly described as "digital negatives". Like transparency film and unlike negative film, raw image pixels contain positive exposure measurements. The raw datasets are more like undeveloped film : a raw image can be developed by software in a non-destructive manner to reach a complete image that resolves every pixel in an RGB color space. Raw development adjustments include color, contrast, brightness and details recovery. A given raw dataset can be developed many times with different adjustments.

When liquid lenses use no mechanical components, durability is increased, as there are no moving parts to wear out or fail. Eliminating these elements also means liquid lenses consume minimal power, which should be good news for smartphone battery life. And whichever technique is used to manipulate the fluid cell, the liquid itself is generally less sensitive to vibration than a standard lens, which should result in improved optical image stabilization.

Less commonly, raw may also refer to a generic image file format containing only pixel color values. For example, "Photoshop Raw" files (.raw) contain a pure array of bytes top-to-bottom, left-to-right pixel order. Dimensions must be input manually when such files are re-opened, or a square image is assumed. Also the channel size and bit-depth per channel has to be provided when opening this format, as the ambiguities of whether the bytes are to be decoded as single channels at high precision, or multiple channels at lower precision, is not determinable from the byte array itself. Due to its simplicity, this format is very open and compatible, though limited by its lack of metadata and run-length encoding. Especially in photography and graphic design, where color management and extended gamuts are important, and large images are common.

The average camera phone lens today is restricted to a fixed focal length. Adding versatility means either adding more lenses – or switching to a larger camera with adjustable optical elements.

Despite their availability and potential advantages, liquid lenses have only just arrived on smartphones. Xiaomi’s folding Mi Mix Fold flagship – launched in April 2021 – is the first consumer handset to feature a liquid lens.

Liquid lenses offer several advantages over traditional lens technology. The main one is their ability to alter focal length without any moving mechanical parts. That means liquid lenses can be kept small and light.

DNG is the only raw image format for which industry-wide buy-in is being sought. It is based upon, and compatible with, the ISO standard raw image format ISO 12234-2, TIFF/EP, and is being used by ISO in their revision of that standard.[28] Makers of "niche" cameras who might otherwise have difficulty getting support from software companies frequently use DNG as their native raw image format. Pentax uses DNG as an optional alternative to their own raw image format. There are 15 or more such companies, even a few that specialize in movie cameras, including Leica, Samsung, Ricoh, Pentax, Hasselblad.[28][29] In addition, most Canon point & shoot cameras can support DNG by using CHDK, and Better Light can export to DNG.[29] Open-source developers also use DNG.[15]