December 13, 2009
Top 3 Tips for Taking Great Pictures with Digital Cameras
There are many tips for taking great pictures with digital cameras. Many individuals believe that taking pictures digitally requires no specific skill or prior knowledge, but the truth is that digital based cameras integrate a high level of features that makes it challenging to capture pictures in the way that you want, or the way that you expect. By knowing a few tricks, you can capture beauty in every shot that you take. The following represents 3 tips that you can use in order to truly capture the essence of every photo that you take:
1. Many digital cameras come with preset balance settings such as “Beach”, “Sunny”, “Cloudy”, “Night”, and similar settings. Prior to taking pictures, it is important to learn how to access these balance settings and to experiment with each one. This way, when you indulge in taking pictures you will know which balance setting will compliment the photograph and can set the camera to that setting.
2. Do you enjoy taking a lot of pictures of the great outdoors or of people and places outside? If so, then it is likely that you will benefit from what is referred to as a “Polarizer”. This is a special filter that is often used when photographing landscapes and natural scenes. It works to reduce the amount of glare that is displayed in the image and even eliminates reflections that are not intended to be caught. If you are unable to acquire a polarizer filter, simply place a lens from a pair of old sunglasses over the viewing area of the camera - this will provide the same effect.
3. The next step to taking great pictures with digital cameras is to research the zoom mode on your camera. This is also often referred to as “Macro Mode”. This feature will permit you to take pictures of items that are typically hard to capture in close up. For example, you may capture a line of ants, or a flower in your garden.
It is easy to take great pictures with digital cameras. It may seem a bit overwhelming, but it is important to learn all that you can regarding the features of your camera. Once you know what can be done with it, you may incorporate these top 3 tips to capture some fascinating shots!
The author of this post is a big fan of TipDrop.com, a great place to post tips to help out other users.
Filed under Beyond Random Ramblings by Arjuna
December 2, 2009
Becoming a Movie Maker: Digital Video Cameras
Buying a digital video camera and digital video camera software can be a fun and exciting proposition, with many different easy to use options on the market today. There are also choices available whether the individual is a budget buyer and wants to stay under five hundred dollars on the purchase, or if they use the camera for their advertising business or other media production company and can spend thousands on a camera. Depending on the buyer, there are certain features that should not be neglected in order to have a quality product that can be enjoyed for years to come.
On a Budget
For buyers of digital video cameras who are on a tight budget, they will need to look for at least the minimum specifications in a camera. The lens of the camera should have a zoom of at least ten times on it as well as a stabilization feature so that the camera does not have to be on a tripod for filming. In addition, the megapixels should be over six in order to have clarity of picture and the ability to do some editing to the film. The illumination rating should be at a minimum seven lux so that the lighting does not affect the film quality as badly, as well as having an automatic exposure control so that the individual does not have to know as much about shooting video in order to still have a good video quality. Many meat traders are using their digital cameras to shoot pictures of pork ribs wholesale and then post them online.
The focus of the digital video camera should be automatic with the electronic zoom available with the trigger. The LCD screen should be large enough to clearly view the video, so about three inches is the best. In addition to these features, there should also be a FireWire, USB 2.0, A/V, S-Video, and a microphone port in the digital video camera for the different attachments and hookups.
Often, even with these budget digital video cameras, there are software programs that come with them to help individuals edit and specialize the videos once they are finished and want to store them. Some of these features are editing software that helps individuals to splice different sections together, add music or other sound recordings to the sound of the video clip, fade into and out of the video, and add captions. In addition, these cameras are also useful to pork meat traders, who use them to shoot videos of pork ribs wholesale so they can post them on their websites. There is also software available that can help individuals that have older versions of film recordings, such as 8mm or Hi8 video, and be able to convert those into digital recordings for better preservation of the film.
Filed under Beyond Random Ramblings by Arjuna
October 21, 2009
A guide to Film and Digital Photography.
Spatial Resolution
Numerous measures can be used to assess the quality of still photographs 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 photographs involves numerous issues. For film, this issue depends upon the size of film used (35 mm, medium format or large format), the speed of the film used and the quality of lens fitted to the camera.
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 typically arranged in a quadrilateral grid pattern, making images susceptible to moiré pattern artefacts, whereas film is not affected by this because of the random orientation of grains.
Estimates Approximations of a picture’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.
The working commercial photographer would often opt for the use of a higher quality product being that in the medium format or large format films. 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 considering film and digital and between different types of camera, it is necessary to think about the medium which will be used for display and the viewing distance. For instance, if a picture will only be viewed on a TV or VDU, (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 degrades shadow areas of electronic images with random pixels of a different colour. Film grain becomes obvious in areas of even and delicate tone. Grain and film sensitivity are linked, with more sensitive films having more obvious grain. Likewise, when used at high sensitivity settings, digital camera pictures show increased noise than those made at lower sensitivities.
Available technology currently introduces 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 condition known as reciprocity failure.
Dynamic Range
The topic of dynamic range (DR) is very detailed . Comparisons between film and digital media should consider:
Just one comparison cannot provide enough information to 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 top end 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.
Camera manufactures are looking at ways to improve the dynamic range so that both the professional photographer and the consumer gain improved results. 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
The majority of digital SLR camera and all consumer compacts 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 camera and lens set up increases as the imaging area decreases, for a given f-number. This may have plusses 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, professional photographers often limit the depth of field to create certain effects, such as isolating a subject from its background.
Pixel noise and light sensitivity 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. 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 accept 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. This figure is typically 1.5, but can vary from camera to camera. 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.
Typically 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 consumer compact means that prints are extreme enlargements of the original picture and that the lens must perform well in order to provide enough quality 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
Dust on the image sensor always needs to be addresses by the portrait photographer.
DSLR cameras are especially prone to dust problems because the sensor remains in place, where a film advances through the camera for each exposure . 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 and tear 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 images .
Compact digital cameras are fitted with fixed lenses; dust is excluded from 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 an original , which contains only the information admitted through the aperture of the camera.
Film images are very difficult to falsify , 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. However, there are digital cameras that can produce authenticated images. If someone modifies an authenticated image, it can be determined with special software.
SanDisk claims to have developed a write once memory stick for cameras and that the images once written cannot be altered.
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 manufacturers 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. For example, 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
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.
For large format and ultra large format photography, film may have some advantages, both over price and flexibility - at least outside of a studio - as large format digital cameras use scanners rather than a single sensor, these cameras are extremely expensive and not very portable.
Price
Film and digital imaging systems have different cost emphases. 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 bought 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.
Filed under Beyond Random Ramblings by Arjuna