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With S, I have to use manual all the time to get the picture I wanted. Even when I use shutter or aperture priority, the camera will sometimes make weird decisions, such as picking high ISO and high aperture number. I suspect even until today Canon never bothered to change that.
For “at 24mm it seems so that there is a bug in autofocus or the AF ist not very reliable”, the only way is to point AF to a “highest contrast” area in your subject, and lock the AF If a camera missed AF in normal light some time, it will miss most of the AF, if not all, in low-light especially we use larger aperture in low-light. My S nails focus quickly, but not sharp. I don’t know if that’s the IS and lens combo thing. Anyone can tell me, if I can improve the sharpness in some way?
Thanks Mike! Actually, I usually steps down t f2. But i agree: the Automode is far from making good pictures. AutoWB is good , but not in energysaving light, so i use a custommade balance manual. If AF fails in Macro, point the object with touch! Hint: You should use the zoomwip and get the Info of possible mini-maxi distance. There are moments with a pocket camera where I really want to “shoot from the hip” the point of a pocket camera!
But something seems “wrong” with image quality. I’m forced to dive into RAW, and I will, by gum. There’s a long list of obvious improvements that should be made in Canon’s app which applies to all wifi canons. I’d like to view-on-camera with zoom. I’d like to delete from camera. Someone in this forum said “two clicks to sync new shots with Drive” I haven’t found the recipe yet.
I have a second battery on order, which solves the immediate problem. I just want to clarify your point 1. Do you mean you can’t shoot in RAW when you select auto mode? But same thing in S no RAW in auto mode. Some comments say it’s unusably laggy. I found no noticable lag at all. I can’t explain that, but it’s true. Tried the store model: it was fine. Not an issue. I’m not a pro photographer, and I take a picture, line up my next picture, and shoot it.
I have glasses. I tried the Sony EVF. It was a blurry mess with and without my glasses. I suppose “people who don’t care about EVF” includes everyone wearing glasses, then that’s me. I heard all this “massive fail: does not rotate beyond degrees”. It’s a massive win that the thing rotates at all.
I have refound the joy of my very first nikon swing-digital, where I can shoot from my lap – great candids. Have you done that? I’m new to list. Only an amateur. Never shoot videos. Took a few snow shots in AUTO vs. Previous XS20 had an auto setting for action stills in auto setting; nothing similar that I can find on this camera. Any advice about manual settings??? I’m totally an automatic mode amateur–but maybe I can upgrade my skills with expert’s advice.
Lot of features on RX III as well as Powershot G7 x has been discussed but I want to know if there is any digital zoom on those cameras and how are the results of those digital zooms as far as movie and photos are concerned indoors for school and church programs.
I may be shooting from a distance of 30 to 50 feet and the optic zoom may not be sufficient. Does any one know the quality of digital zoom on each camera? In terms of image quality using digital zoom – I would still pick the Canon because of my comments above, plus the Canon retains ability to use autofocus points, whereas the Sony only has 1 focus point the whole frame! I tried the Canon today and it seemed noticeably slower on shot to shot speeds using the same class 10 card.
Can I ask your feelings on this I love the look of the canon spec wise over the MII sony but the ability to focus quickly and take repeated shots is important to me. Can I ask your thoughts on this? Sorry to take so long to reply. Hope this helps. Thanks for coming back. After testing myself I agree, but I still have the Canon pegged as my next purchase! Just suggested that my friend buys this for his wife for Christmas.
Oh, and around GBP maximum so a little over budget. I went for this one because 1 it will produce a much better quality of image that the mobile phone she is currently using; 2 ability to take excellent portraits at all focal lengths with the large apertures; 3 a useful zoom length that gives some proper telephoto without over-reaching, but really useful wide angles; 4 she doesn’t need a viewfinder. I think the start-up time issue sounds of minimal importance and the only concern is the AF issue in low light.
Anyway, should I have suggested something else for the price? I couldn’t see anything better When my Sony RX v. I really would not use the pop up eye piece, although that sounds very good for many I know. I really liked the shooting experience of the RX vI. The camera was fast and the pictures in RAW were excellent. I had never had a better pocket camera. I went with the Canon G7x because of the , f 1. At first the shooting experience seemed awkward, but after a month with this camera, I feel very comfortable.
RAW output is exceptional. I take a lot of portrait and the lens specs were the only option compared to the Sony. If the Sony had a 24 – , f 1. One of the key useful features on a compact or in fact any camera in low light situations. I know for a fact that image stabilization on RX does not exist. Review should have included the measurement of effectiveness of image stabilization on R7 X, and comparison to direct competition RX III.
The Sony RX has an optical stabilization system. The best comparison for me is the shooting experience. I have a G12 and have refused to get a newer Canon pocketable because of Canon’s apparent decision to confine fully articulating screens to its DSLRs. I don’t consider the G1 X pocketable. I might settle for a flip-up screen in exchange for a larger sensor and faster lens, however.
My question is about the criticism of the G7 X for slow operation, how does it compare in this respect with the G12? Isn’t there a setup option to disable animations entirely?
If not, it should be added in a firmware upgrade – particularly if Canon gets a lot of flack about them. Despite complaints, the auto-focus doesn’t feel slow to me; it focuses in light so low I can hardly see myself. Yes, sometimes it fails to focus, but touch a spot on the screen to focus on and you’re on your way a great reason to choose the G7x over the Sony.
The touch screen is undervalued by reviewers. Image quality is magnificent. Key to me is low-light photography without flash. The 1″ sensor and the bright lens combine to allow incredible low-light photos that turn out brighter than I see with my eyes. Build quality is great: try to wiggle the lens barrel, the G7x is nicely machined.
Battery life is sad; you won’t make it a day with heavy use, so carry a spare. WiFi connection was a major consideration. Two clicks I am backing up to Google Drive , sending only pix that were not sent before. Two clicks and a photo is posted on Facebook. Connect directly to smartphone just as easily. It’s not just the bigger, likely Sony-branded sensor that’s the G7 X’s attraction, it’s also the mm equivalent F1. On paper it’s a serious rival to Sony’s RX series, widely considered class leaders in terms of compact camera image quality.
Does the G7 X live up to its impressive spec sheet? Read review. From the outside, Canon’s PowerShot G7 X enthusiast compact looks like the S-series models that came before it, but inside it’s an entirely different story. We’ve made a substantial update to our First Impressions Review of the G7 X including a writeup of our shooting experience and performance tests. Read more. The Canon G7 X and Panasonic LX were two of the most talked-about cameras to emerge from Photokina , both managing to squeeze large sensors into compact camera bodies.
We’ve been using a production G7 X for a few days and ahead of our usual round of studio tests and hands-on assessment, we’ve created a quick gallery of real-world photos.
See gallery. As well as getting our hands on this season’s newest photo gear we also sat down with executives from several major camera manufacturers. One of them was Masaya Maeda of Canon. Our time with Mr Maeda was brief, but in our conversation he shared reactions to the 7D Mark II, and explained that Canon is very serious about mirrorless, and is also committed to making higher-resolution sensors. Click through to read more.
The Sigma 20mm F1. Does it take pretty pictures though? We have the answers. Sigma’s been on a roll with their mirrorless Art series lenses. Does the new 24mm F1. It brings a new, 25MP sensor and bit 4K capture at up to p. We’ve put it to the test, both in the studio and out in the field. In our tests it delivers big performance and offers a few good reasons why you might choose a 12th-Gen Intel laptop over a Mac.
Canon’s high end APS-C mirrorless camera has plenty of compelling features, but is it worth the price? Jordan took it on vacation to find out.
These capable cameras should be solid and well-built, have both speed and focus for capturing fast action and offer professional-level image quality. What’s the best camera for shooting landscapes? High resolution, weather-sealed bodies and wide dynamic range are all important. In this buying guide we’ve rounded-up several great cameras for shooting landscapes, and recommended the best.
If you’re looking for the perfect drone for yourself, or to gift someone special, we’ve gone through all of the options and selected our favorites. Although a lot of people only upload images to Instagram from their smartphones, the app is much more than just a mobile photography platform.
In this guide we’ve chosen a selection of cameras that make it easy to shoot compelling lifestyle images, ideal for sharing on social media. The latest version of Sigma’s 20mm F1.
Check out our gallery to see how it performs! Two of the GPUs are designed for workstation desktops, while a third is for laptops. This second-generation adapter is smaller, faster and quieter than its predecessor. Midwest Photo was robbed late last week after a stolen truck broke through the store’s front entrance. The store is in the progress of recovering from the damage and stolen goods. Photographers should be on the lookout for any suspicious product listings online.
Travel with Peter to see how he shoots, and view some of the spectacular photos he captures along the way. Includes sample gallery. We go hands-on with Sigma’s latest ‘Digital Native’ wide-angle lenses for L-mount and Sony E-mount cameras to see what features they have and what sets them apart from the rather limited competition. Sony has announced in-camera forgery-proof photo technology for its a7 IV mirrorless camera. The technology, aimed at corporate users, cryptographically signs images in-camera to detect future pixel modification and tampering.
It uses tracks, cords and hooks to store your gear flat against the wall without hiding it from view. The new Sigma 24mm F1.
Check out our sample gallery to see how sharp it is, as well as how it handles flare, chromatic aberrations and sunstars. Sigma’s new 20mm F1. Chris and Jordan run through their absolute favorite lenses for Sony E-Mount, including both Sony lenses and third party options.
Nikon has released the financial results for the first quarter of its fiscal year, revealing increased year-over-year revenue and profits. Alfie Cameras is launching its Alfie TYCH next month on Kickstarter, but before then it needs beta testers to see how its triple lens half-frame camera performs. NASA is preparing for a simulated Mars mission that will house four crew members in a module on Earth. The crew will remotely control drones and rovers to collect rock samples on a simulated Mars.
Skypersonic, a remote control drone company, is supplying mission-critical technology as part of the mission. The explosion created one of the most energetic short-duration gamma-ray bursts ever observed. The Tamron Lens Utility Mobile app is set to launch later this year. The app will let you use your compatible Android device to control, customize and update compatible Tamron lenses without the need for a computer.
The images, which appear to be screenshots from a press briefing, reveal some of the details of the forthcoming lens. The Peter McKinnon camera tool features a patent-pending design that features integrated Phillips and flathead drivers, as well as extendable arms capable of holding four other bits that can be swapped out to fit your needs. Nikon has updated the firmware for its Nikkor Z 50mm F1. Is this good or bad for the industry, and what are the long-term implications?
It’s a far cry from the conventional lenses you’re used to seeing, but it’s sure to give you a look, unlike any optic you can purchase online. Reading mode: Light Dark. Login Register. Best cameras and lenses. Previous 1 Introduction. Tags: review , canon.
Next page. Canon PowerShot G7 X. Discuss in the forums See full product details View sample images. We are retrieving offers for your location, please refresh the page to see the prices. View Comments Comments All Richard Butler The “inch type” system doesn’t refer to a measurement of the sensor, it’s an obscure naming system based on vidicon tubes. Serality Instead of repairing my S for a battery-reporting error they sent me a refurb G7 X.
Seizon Totally agree! Seizon I really like this camera so far SilverKylin When will we have the full review of the third competitor in this market? Panasonic TZ S Umair Neez, I think what seems to be a contradiction is a difference is how they autofocus.
DMacCt Owned an S90 for many years and liked it for its compact size, zoom lense and good image quality. MikeFairbanks One thing I couldn’t find in the article is the pocketable-aspect of the camera. Smaug01 As for blending in, I’ve heard that the thing that makes Parisians treat you a little better is to attempt French. AlienAl It would be very helpful to know what lenses were used in these test shots Studio Comparison , and to be able to compare two or more?
Strachen I have not tested all the power shot cameras, but the ones I have owned S80, s90, s and for a week an s had no laggy menus. Emanuel I don’t get it. SilverKylin Nothing is “must-have” on this camera, but a lot of the things mentioned are “nice to have”, especially the close competitor has the features.
DMacCt I did this flash tilt work-around and it works very well. Skinnerrr “Sadly, for those hoping to pull the flash back so it can ‘bounce’, to give a less harsh result, it’s not possible on the G7 X. DMacCt Camera connects with phones by being a wifi node which your phone connects to.
Pat Cullinan Jr Viewfinder type – None. Terrific otherwise. I don’t want too loose my money again. Craig Atkinson Is there a way to display the equivalent focal length on the screen? Craig Atkinson ah, got it. Zoom ring set to step Shiranai I’ve also replaced my XZ-1 with this cam, and so far I didn’t regret it.
Neez Is AF really that good, this review seems to contradict what you’re saying. BeaniePic Only seen your reply. Johnny I’ve only used it in the store a few times, but autofocus is very good. Timmbits thanks, that is good, pertinent feedback.
Mike FL jst13 For “at 24mm it seems so that there is a bug in autofocus or the AF ist not very reliable”, the only way is to point AF to a “highest contrast” area in your subject, and lock the AF People return the cameras for the reasons above.
Here are my hates: 1 JPEG seems very aggressive, giving “soft shots”. Here are my likes: 1 I did not experience slow menu or UI. Love, especially with swung viewfinder. Barbara Ludt I’m new to list. Here is a short article for how to using Tv mode, I hope it will help you. Vilas7 Lot of features on RX III as well as Powershot G7 x has been discussed but I want to know if there is any digital zoom on those cameras and how are the results of those digital zooms as far as movie and photos are concerned indoors for school and church programs.
Andy Palmer Just suggested that my friend buys this for his wife for Christmas. Eliott When my Sony RX v. Carouge The Sony RX has an optical stabilization system. Read comments in the above thread. Can anybody try G7 X IS using the pdf template provided? OrlandoPete removed. You may also like. More about gear in this article. Latest sample galleries. Sigma 20mm F1. Sigma 24mm F1. Canon EOS R10 production sample gallery. See more galleries ». Latest in-depth reviews.
Read more reviews ». Latest buying guides. Best cameras for landscape photography in Best drones in Best video cameras for photographers in Best cameras for Instagram in Check out more buying guides ». Discover more challenges ». Aug 10, 5 video. Aug 10, 1 sample gallery. Aug 10, Aug 9, Midwest Photo is recovering after yet another major camera gear robbery. Aug 9, 40 Sponsored. Hands-on: A closer look at Sigma’s new 20mm F1. Sony’s a7 IV gets anti-forgery crypto signature technology for commercial purposes.
Aug 8, camera news. Aug 8, Aug 8, 45 video. Aug 8, 25 sample gallery. Sigma announces 24mm F1. Aug 8, 28 lens news. Sigma reveals 20mm F1. Aug 8, 76 lens news. Aug 6, video. Aug 5, 96 camera news. Aug 5, Aug 5, 5. Scientists use ALMA observatory to capture neutron star merger for the first time ever. Aug 4, Aug 4, review. Tamron is developing an Android app that will let you update and customize your lenses on-the-go.
Aug 3, Aug 3, lens news. Canon says the camera market has ‘largely bottomed out,’ expects pro and ‘advanced amateur’ segments to grow.
Aug 2, Nikon adds linear focus mode to three of its Z-mount lenses via firmware update. Aug 2, lens news. Remote ID for drones ruled constitutional. Is that a good or bad thing for drone owners? This has the immediate implication of Symbol 1 being only able store information regarding the first 15 zeroes preceding the non-zero AC coefficient. One is for ending the sequence prematurely when the remaining coefficients are zero called “End-of-Block” or “EOB” , and another when the run of zeroes goes beyond 15 before reaching a non-zero AC coefficient.
In such a case where 16 zeroes are encountered before a given non-zero AC coefficient, Symbol 1 is encoded “specially” as: 15, 0 0. The overall process continues until “EOB” — denoted by 0, 0 — is reached. See above.
From here, frequency calculations are made based on occurrences of the coefficients. In our example block, most of the quantized coefficients are small numbers that are not preceded immediately by a zero coefficient.
These more-frequent cases will be represented by shorter code words. The resulting compression ratio can be varied according to need by being more or less aggressive in the divisors used in the quantization phase. Ten to one compression usually results in an image that cannot be distinguished by eye from the original. A compression ratio of is usually possible, but will look distinctly artifacted compared to the original. The appropriate level of compression depends on the use to which the image will be put.
Those who use the World Wide Web may be familiar with the irregularities known as compression artifacts that appear in JPEG images, which may take the form of noise around contrasting edges especially curves and corners , or “blocky” images. These are due to the quantization step of the JPEG algorithm.
They are especially noticeable around sharp corners between contrasting colors text is a good example, as it contains many such corners. The analogous artifacts in MPEG video are referred to as mosquito noise , as the resulting “edge busyness” and spurious dots, which change over time, resemble mosquitoes swarming around the object.
These artifacts can be reduced by choosing a lower level of compression ; they may be completely avoided by saving an image using a lossless file format, though this will result in a larger file size. The images created with ray-tracing programs have noticeable blocky shapes on the terrain.
Certain low-intensity compression artifacts might be acceptable when simply viewing the images, but can be emphasized if the image is subsequently processed, usually resulting in unacceptable quality. Consider the example below, demonstrating the effect of lossy compression on an edge detection processing step. Some programs allow the user to vary the amount by which individual blocks are compressed. Stronger compression is applied to areas of the image that show fewer artifacts.
This way it is possible to manually reduce JPEG file size with less loss of quality. Since the quantization stage always results in a loss of information, JPEG standard is always a lossy compression codec. Information is lost both in quantizing and rounding of the floating-point numbers. Even if the quantization matrix is a matrix of ones , information will still be lost in the rounding step.
Rounding the output to integer values since the original had integer values results in an image with values still shifted down by This is the decompressed subimage. If this occurs, the decoder needs to clip the output values so as to keep them within that range to prevent overflow when storing the decompressed image with the original bit depth. The error is most noticeable in the bottom-left corner where the bottom-left pixel becomes darker than the pixel to its immediate right.
These requirements are specified in ITU. T Recommendation T. For example, the output of a decoder implementation must not exceed an error of one quantization unit in the DCT domain when applied to the reference testing codestreams provided as part of the above standard.
While unusual, and unlike many other and more modern standards, ITU. JPEG compression artifacts blend well into photographs with detailed non-uniform textures, allowing higher compression ratios.
Notice how a higher compression ratio first affects the high-frequency textures in the upper-left corner of the image, and how the contrasting lines become more fuzzy. The very high compression ratio severely affects the quality of the image, although the overall colors and image form are still recognizable. However, the precision of colors suffer less for a human eye than the precision of contours based on luminance.
This justifies the fact that images should be first transformed in a color model separating the luminance from the chromatic information, before subsampling the chromatic planes which may also use lower quality quantization in order to preserve the precision of the luminance plane with more information bits. For information, the uncompressed bit RGB bitmap image below 73, pixels would require , bytes excluding all other information headers.
The filesizes indicated below include the internal JPEG information headers and some metadata. On grayscale images, a minimum of 6. For most applications, the quality factor should not go below 0. The image at lowest quality uses only 0. This is useful when the image will be displayed in a significantly scaled-down size. The medium quality photo uses only 4. However, once a certain threshold of compression is passed, compressed images show increasingly visible defects.
See the article on rate—distortion theory for a mathematical explanation of this threshold effect. More modern designs such as JPEG and JPEG XR exhibit a more graceful degradation of quality as the bit usage decreases — by using transforms with a larger spatial extent for the lower frequency coefficients and by using overlapping transform basis functions.
From to , new research emerged on ways to further compress the data contained in JPEG images without modifying the represented image. Standard general-purpose compression tools cannot significantly compress JPEG files. Typically, such schemes take advantage of improvements to the naive scheme for coding DCT coefficients, which fails to take into account:.
Some standard but rarely used options already exist in JPEG to improve the efficiency of coding DCT coefficients: the arithmetic coding option, and the progressive coding option which produces lower bitrates because values for each coefficient are coded independently, and each coefficient has a significantly different distribution. Modern methods have improved on these techniques by reordering coefficients to group coefficients of larger magnitude together;  using adjacent coefficients and blocks to predict new coefficient values;  dividing blocks or coefficients up among a small number of independently coded models based on their statistics and adjacent values;   and most recently, by decoding blocks, predicting subsequent blocks in the spatial domain, and then encoding these to generate predictions for DCT coefficients.
It contains two static images, one for the left eye and one for the right eye; encoded as two side-by-side images in a single JPG file. This file format can be viewed as a JPEG without any special software, or can be processed for rendering in other modes.
It contains two or more JPEG files concatenated together. Other devices use it to store “preview images” that can be displayed on a TV.
In the last few years, due to the growing use of stereoscopic images, much effort has been spent by the scientific community to develop algorithms for stereoscopic image compression. It was first published in and was key for the success of the standard. In March , Google released the open source project Guetzli , which trades off a much longer encoding time for smaller file size similar to what Zopfli does for PNG and other lossless data formats.
Extension layers are used to modify the JPEG 8-bit base layer and restore the high-resolution image. Existing software is forward compatible and can read the JPEG XT binary stream, though it would only decode the base 8-bit layer. The standard should also offer higher bit depths 12—16 bit integer and floating point , additional color spaces and transfer functions such as Log C from Arri , embedded preview images, lossless alpha channel encoding, image region coding, and low-complexity encoding.
Any patented technologies would be licensed on a royalty-free basis. The proposals were submitted by September , leading to a committee draft in July , with file format and core coding system were formally standardized on 13 October and 30 March respectively. From Wikipedia, the free encyclopedia. This is the latest accepted revision , reviewed on 1 August Lossy compression method for reducing the size of digital images. A photo of a European wildcat with the compression rate decreasing and hence quality increasing, from left to right.
Left: a final image is built up from a series of basis functions. Right: each of the DCT basis functions that comprise the image, and the corresponding weighting coefficient. Middle: the basis function, after multiplication by the coefficient: this component is added to the final image. Main article: Entropy encoding. Slight differences are noticeable between the original top and decompressed image bottom , which is most readily seen in the bottom-left corner.
September Retrieved 12 July Collins English Dictionary. Retrieved The effects of video compression on acceptability of images for monitoring life sciences experiments Technical report.
Journal of Electronic Imaging. S2CID BT Group. Archived from the original on 5 August Retrieved 5 August BBC News. Retrieved 13 September Heise online in German. October Retrieved 5 September The Atlantic. Archived from the original on 3 September Retrieved 16 October American National Standards Institute.
Retrieved 13 July Archived from the original on Pennebaker; Joan L. Mitchell JPEG still image data compression standard 3rd ed. ISBN Library of Congress. Ecma International. Archived from the original on August 17, CNET News. February 3, May 26, Public Patent Foundation.
November 2, Patent No. Archived from the original on June 2, Microsoft Developer Network. Video Imaging DesignLine. February 24, Retrieved May 28, Electronic Imaging. Bibcode : JEI Bauermann and E. Ponomarenko, K. Egiazarian, V. Lukin and J. Stirner and G. January 3, Archived from the original on January 23, Siragusa, D. Swift VRex, Inc. Archived from the original PDF on Retrieved 29 May Archived from the original on 22 August Retrieved 22 August Multimedia compression and container formats.
RTP Ogg. Comparison of audio coding formats Comparison of video codecs List of codecs. See Compression methods for techniques and Compression software for codecs. Graphics file formats. Category Comparison. Hidden categories: CS1 German-language sources de CS1 maint: bot: original URL status unknown Webarchive template wayback links CS1 maint: uses authors parameter CS1 maint: archived copy as title Articles with short description Short description is different from Wikidata Wikipedia pending changes protected pages Commons category link is on Wikidata Articles containing video clips.
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Wikimedia Commons. September 18, ; 29 years ago Lossy image compression format. A popular format which has been the de facto file format for images encoded by the JPEG standard. Indicates that this is a progressive DCT-based JPEG, and specifies the width, height, number of components, and component subsampling e.
This marker is followed by two bytes indicating the fixed size so it can be treated like any other variable size segment. Begins a top-to-bottom scan of the image. This marker specifies which slice of data it will contain, and is immediately followed by entropy-coded data. Inserted every r macroblocks, where r is the restart interval set by a DRI marker.
Not used if there was no DRI marker.