Aside from the codec and frame size, the most important factor in determining the quality of the finished product when rendering video is bitrate.
The term bitrate refers to the number of bits per second used to encode a given clip. Just as the quality of a still image is measured in resolution, the quality of a video file is measured by the bitrate.
For video destined for the web, you don’t want to encode with the bitrate set too high for several reasons:
1. You will make your viewers wait unnecessarily long before they can start viewing your video.
2. Higher bitrate videos put an extra strain on your server and will cost you more money in extra bandwidth.
3. Older computers will have a hard time decoding very high bitrate codecs in real time, leading to dropped frames and jerky appearing motion.
4. Uploading will be slower.
5. You’ll use up unnecessary room on your server and local drives.
On the other hand, you don’t want to encode video with bitrate too low either otherwise the visual quality will suffer – there will be pixelization and blockiness, especially in any areas with motion.
Let’s Get Progressive
“Progressive download” means, as soon as your viewers click to view a particular video, the video starts downloading to a hidden cache file on the users machine.
As soon as enough of the video has downloaded to provide the user with an uninterrupted viewing experience, the video begins playing (as long as it’s set to: autoplay = “true”).
With a video that is encoded at a lower bitrate than the total bandwidth of the connection between the video server and the viewer, the video will start playing within a second or two, and continue without stopping. This is obviously the goal to aspire to for most purposes.
Fortunately, choosing the best bitrate for video to achieve this goal while retaining visual fidelity is no longer just a matter of luck.
The bitrate calculator in DV Kitchen will give you the bitrate that satisfies whatever criteria you set.
One of the biggest thrills achieved from a fishing trip is holding your prize fish and posing for the picture which will tell the tale of your victorious fishing adventure. Planning a holiday that includes fishing in Florida seas will get you a full catch of memories that may stay with you for a life-time.
The best thing about planning such a holiday is that you have countless decisions for your destination ; since Florida is a headland, there are many places in which to cast your line. Waters rich in plentiful marine life, there is not a perimeter city that doesn’t offer a wide variety of fishing options. With the Gulf of Mexico surrounding the western coast and the Atlantic Ocean presiding on the eastern side, Florida oceans are a fisherman’s mecca, with numerous sorts of fish to angle.
Offshore fishing or deep sea fishing is a widely popular journey, offering half-day or full day trips. By booking a fishing trip with a well known charter, you’ll have the assurance of knowing that you’ll be navigated through the waters by an experienced captain, one who knows the water well and has the gear to identify areas populated by enormous faculties of fish. Another bonus is that you’re going to most likely not have to have a fishing license if on board a chartered fishing ship ; according to the Florida Wildlife Conservation, you will be covered under the vessel license of the captain. All fishing equipment is supplied by the chartered service as well, so you won’t need to bring poles, bait, line, or tackle to enjoy your day.
The kind of fish that are probably going to be caught when fishing in Florida oceans will rely upon the area, and can be set by asking the captain of the fishing vessel. Forthe Gulf of Mexico, fishermen may see shark, barracuda, giant red fish, grouper, tuna and lots more being hauled on board. On the Atlantic side, grouper, snapper, barracuda, shark, mahi and mackerel are common catches.
If traveling out onto the rolling blue waves of the ocean does not appeal to you for a fishing trip, or if time simply doesn’t permit such an escapade, you can still enjoy fishing in Florida seas with an inshore fishing day. There are great catches to be made from the shore or pier, using your own fishing hardware. You will want to check to confirm what kinds of fish are caught in the area you are staying to be sure you’ve got the suitable poles, lines and tackles. Sorts of fish will differ again with the area, but snook, tarpon, trout and red fish are the commonest, and can be discovered on all coasts.
Few holidays can compare to one fishing in Florida seas. With the anticipation of catching the massive one comes the satisfaction of bringing your prize on board after fighting it up thru the depths, identifying what you have caught only as it breaks the surface. Net yourself a great memory by fishing in Florida oceans on your next holiday.
Visitors to Kauai arrive with dreams of a vacation spent in natural beauty and luxury. Not everyone owns a second home on this beautiful island, thus they depend on Kauai vacation rentals to make their vacation dreams come true. Rental accommodations on this island accommodate a wide spectrum of needs, from affordable cottages and studios to spacious 5 bedroom luxury suites.
Well-known visitors to the island include many celebrities that want to avoid public areas as far as possible. Renting one of the many vacation homes on the island provides the privacy and seclusion they seek. These luxurious accommodations are available all year round.
If you like to drive around the island for a while, there are car rental companies available that will provide you with the vehicle of your choice.
Hotel resorts are very popular with the tourist that just wants to relax whilst being pampered by attentive staff, and Kauai offers many spectacular hotels and resorts to do just that. Condos, where you can do as you please, are available as a renting option as well. Expect a swimming pool, golf course or even tennis courts at most of these luxury condos. For families seeking a home-like environment, many vacation rental homes are located on all parts of Kauai.
Secluded rental properties tucked away right on the beach offer a hiding place for those seeking to get away from it all. Nothing beats the feeling that your little piece of heaven, with its own beach, belongs to you and you alone. Enjoy your meals and refreshments while listening to the Pacific Ocean right outside your window.
Kauai is popular for honeymoons for many reasons. This is the oldest island in the Hawaiian archipelago, and also one of the most beautiful offering a home to many rare birds and luscious rainforest plants. It is timeless and peaceful, and young couples can enjoy their honeymoon in total seclusion. The problem is that this beautiful island is so popular with American couples that you have to book well in advance. It is not crowded – just popular.
The settings that Kauai has to offer are so romantic that it is impossible to spend an anniversary here without rekindling the flames that burned brightly so many years ago.
The island is a dream for those appreciative of the best that nature has to offer, and from the astoundingly clean and beautiful beaches in the north to the ravines and canyons of the west, Kauai has everything to offer. There is a wide selection of hikes and trails for you to follow, and a surprisingly wide choice of vacation accommodation available, such as the condos, villas and beach homes of the main towns such as Princeville or the more traditionally named Ha’ena, Hanalei or Kilauea.
The more quiet eastern coast lures the soulful visitor seeking peace and quiet. Private facilities for rent in and around Anahola, Kapaa and Wailua will have you enjoying the hours pass by totally undisturbed.
Totally opposite is Poipu Beach on the south shore of the island, with hundreds of condo rentals set a few feet from the beach. Referred to as the Million Dollar Coast, this is the place if you want a fabulous climate, plenty of fun, sun and sea, and if solitude is your idea of a nightmare. This is definitely the most touristy area on Kauai and not for those that like a peaceful vacation.
Along with Koloa town close by, this is the tourist center and offers a range of shops and restaurants with excellent food and just as excellent drink. If your idea of heaven is lying on a beach with a cocktail in your hand, then this is for you.
Looking for a Hawaii rental? GreatHawaiiVacationRentals.com provides detailed information to Kauai vacation rentals and Maui rentals.
Spatial Resolution
Several measures can be used to assess the quality of still images the most discussed being the pixel count, presumed to correlate with spatial resolution. This is measured by the quantity of picture elements (pixels) in the image sensor, usually counted in millions and called “megapixels”. Measuring the resolution of both film and digital images involves numerous issues.
Similarly, digital cameras have a variable relationship of resolution to megapixel count; other factors are important in digital camera resolution, such as the number of pixels used to resolve the image, the effect of the Bayer pattern or other sensor filters on the digital sensor and the image processing algorithm used to interpolate sensor pixels to image pixels. In addition, digital sensors are generally arranged in a rectangular grid pattern, making images susceptible to moiré pattern artefacts, whereas film is not affected by this because of the random orientation of grains.
Guesses of a image’s resolution taken with a 35 mm film camera vary. Greater information may be recorded if a finer grain film and or developer are used. Conversely, less resolution may be recorded with poor quality optics or with coarser-grained film. A 36 mm x 24 mm frame of ISO 100-speed film is estimated to contain the equivalent of 20 million pixels.
Because of the size of the imaging area, they have higher resolution than the current top-of-the-range digital cameras. It is estimated that a medium format film image can record around 50 megapixels, while large format films can record around 200 megapixels (4 × 5 inch) which would equate to around 800 megapixels on the largest common film format, 8 × 10 inches, without taking into account lens sharpness. A medium format DSLRs provides from 42 to 50 megapixels, which is relatively similar quality to the medium format film quality.
When deciding between film and digital and between different types of camera, it is necessary to allow for the medium which will be used for display and the viewing distance. For example , if a photograph will only be viewed on a television or computer display , (which can resolve only about 0.3 megapixels and 1-2 megapixels, respectively, as of 2008. HD sets of 1080p are around 2.07mp), then the resolution provided by a very low-end digital cameras may be sufficient. Print mediums work to far greater qualities of around 300 dots per inch (dpi).
Noise and Grain
Thermal noise is a condition that damages shadow areas of electronic images with random pixels of the wrong colour. Grain and film sensitivity are linked, with more light sensitive films having more obvious grain. Likewise, when used at high sensitivity settings, digital camera images show greater noise than those made at lower sensitivities.
The level at which current technology stands at produces random noise to the images taken by digital cameras, produced by heat and manufacturing defects. Nearly all digital cameras apply noise reduction to long exposure photographs to counteract this. For very long exposures it is necessary to operate the image sensor at low temperatures to avoid noise impacting the final image. Film grain for visible light is not affected by exposure time, although the apparent speed of the film does change with longer exposures, a circumstance known as reciprocity failure.
Dynamic Range
The topic of dynamic range (DR) is very detailed . Comparisons between film and digital media should consider:
A single comparison cannot show that digital or film has a smaller or greater dynamic range. Some amateur authors have performed tests with inconclusive results. R. N. Clark, comparing a commercially used digital camera with 35 mm film, reached the conclusion that – Digital cameras, like the Canon 1D Mark II, show a huge dynamic range compared to either print or slide film, at least for the films compared.
For both the public and the professional photographer improvements and developments in digital camera dynamic range can’t come too soon. Some CCDs like Fujifilm’s Super CCD combines photosites of different sizes to give increased dynamic range. Other manufacturers use in-camera software to prevent highlight overexposure. Nikon calls this feature D-Lighting.
Effects of Sensor Size
All compact digital cameras and most digital SLRs have sensors that are reduced to smaller than a 36 mm x 24 mm frame of 35 mm film. This affects aspects of the captured photograph and the way the camera is used. These effects include:
The depth of field of a digital camera and lens set up increases as the imaging area decreases, for a given f-number. This may have advantages for consumer compact digital cameras since they are intended for taking snapshots. More of the image will be in focus than with a larger sensor and the autofocus system does not need to be as accurate to produce an acceptable image. Conversely, photographers often limit the depth of field to create certain effects, such as isolating a subject from its background. Cameras with imaging areas smaller than 36 mm x 24 mm require a wider aperture on the lens to achieve the same degree of selective focusing.
Light sensitivity and pixel noise are both related to pixel size , which is in turn related to sensor size and resolution. As the resolution of sensors increase, the size of the individual pixels has to decrease. This smaller pixel size means that each one collects less light and the resulting signal is amplified more to produce the final value. This also amplifies any noise. With a smaller signal, the signal-to-noise ratio decreases. More noise is present in the image and the higher noise floor means that less useful information is extracted from the darker parts of the image.
Many digital SLRs are able to use lens mounts originally designed for film cameras. If the camera has a smaller imaging area than the lens’ intended film frame, its field of view is cropped. This crop factor is often called a “focal length multiplier” because the effect can be calculated by multiplying the focal length of the lens. For lenses that are not designed for a smaller imaging area whilst using the 35 mm-compatible lens mount, this has the beneficial side effect of only using the centre part of the lens, where the image quality is in some aspects higher.
More often expensive digital SLRs have full-frame sensors that are 36mm × 24 mm, which eliminate depth of field and crop factor problems when compared to 35 mm film cameras.
The smaller sensor size of entry level compact means that prints are a massive enlargement of the original picture and that the lens must perform well in order to provide enough clarity to match the tiny pixels on the sensor. Most digital compacts have sensors that exceed the maximum resolution that the lens is capable of delivering. Increased sensor resolution may even have a negative effect on the overall resolution because of increased noise reduction and in camera processing.
Cleanliness
The cameras available to the portrait photographer address the problems of sensor dust and marks better than consumer cameras.
DSLR cameras are susceptible to dust problems because the sensor remains in place, where a film advances through the camera for each picture. There is a risk of debris in the camera, such as dust or sand, scratching the film; a single grain of sand can damage a whole roll of film. As film cameras age, they can develop wear in their rollers. With a digital SLR, dirt is difficult to avoid, but easy to rectify using a computer with photo editing software available. Some digital SLRs have systems that remove dust from the sensor by vibrating or knocking it, sometimes in conjunction with software that remembers where dust is located and removes dust-affected pixels from pictures.
Compact digital cameras are fitted with fixed lenses; dust does not enter the imaging area. Similar film cameras are often only light tight and not environmentally sealed. Some modern DSLRs, most notably are the high end Canon models, use extensive dust and weather seals to avoid this problem.
Integrity
Film produces a first generation image, which contains only the information admitted through the aperture of the camera.
Film images are very difficult to fabricate, thus in police investigation and in cases where the authenticity of an image is important , like passport or visa photographs, film provides greater security over most digital cameras as digital files may have been modified using a computer. If someone modifies an authenticated image, it can be determined with special software.
Archiving
The archival potential of digital photographs is less well understood because digital media have existed for 50 years. Three issues are involved for archival storage: physical stability of the recording medium, future readability of the storage medium and future readability of the file formats used for storage.
It is important to consider the future readability of storage media. Assuming the storage media can continue to hold data for prolonged periods of time, the short lifespan of digital technologies often causes the drives to read media to become unavailable. For example, the first 5¼-inch Floppy disks were first made available in 1976. However, the drives to read them are already extremely rare 30 years later.
The ability to decode the data is important. Digital cameras save photographs in JPEG format, that has existed for approximately 15 years. Because the instructions on how to decode this format are publicly known, it is unlikely that this files will be unreadable in the future.
Many professional cameras can save in a RAW image format, the future of which is less certain. Some of these formats contain proprietary data which is encrypted by patents, and could be abandoned by their makers at any time for economic reasons. This could make it difficult to read these ‘raw’ files in the future, unless the camera makers were to release information on the file formats.
Additionally many organisations take an active approach to archiving rather than relying on formats being readable decades later. This takes advantage of the ability to make perfect copies of digital media. So , rather than leaving data on a format which may potentially become unreadable or unsupported, the information can typically be copied to newer media without loss of quality. This is only possible with digital media. Digital images may be printed and stored like traditional photographs.
Convenience and flexibility
Flexibility and convenience have been the main reasons for the widespread adoption of digital cameras. With film cameras, film is normally completely exposed before being processed. Only once the film is returned is it possible to see the photograph. Most digital cameras incorporate a liquid crystal display that allows the image to be viewed immediately after exposure. The photographer may delete undesired or unnecessary photographs, allowing the photographer an immediate opportunity to repeat the image. When a user desires prints, it is only necessary to print the required photographs.
With digital imaging, images may be conveniently stored on a personal computer for modification. Professional-grade digital cameras can store pictures in a raw image format which stores the output from the sensor directly rather than processing it immediately to an image. When edited in suitable software, such as Adobe Photoshop or the GNU program GIMP (which uses dcraw to read raw files), the user may manipulate certain parameters of the image, such as contrast, sharpness or colour balance, before producing a final image. Alternatively, users may retouch the content of recorded JPEG images; software for this purpose may be provided with consumer-grade cameras.
Digital photography allows the collection of large amounts of archival documents in a short period of time which has many benefits for the researcher including convenience, saving money and an increased flexibility in using the documents.
Price
Film and digital imaging systems have different cost basis . With digital photography, cameras tend to be significantly more expensive than film equivalents. With digital cameras, taking photographs is effectively cost-free. The price of digital cameras continues to drop and using film may be seen as more expensive than digital.
High quality film cameras are less complicated and therefore less expensive. The major expenses are ongoing film and processing costs. The professional photographer will only identify unsuitable images after developing and printing have been paid for.
Film offers the photographer more control over the depth-of-field than a DSLR with an APS sensor, and the cost of full-frame sensor cameras may be very high. 35 mm single-lens reflex cameras may be acquired for a fraction of the price of a full-frame DSLR. Some lenses are interchangeable between digital and film cameras; film can be an attractive introduction to photography because of this.
The costs associated with digital photography are specialist batteries, memory cards, paper, printer ink cartridges and long-term storage.
With many photographers switching to digital, film cameras and lenses are now available on the second-hand market at often much-reduced prices, allowing for semi-professional and even professional film cameras to be owned by people who would once never have been able to afford them.
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