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The Best digital camera repair Articles on Wine
Photography 101: Reading your Camera's Histogram
Many digital cameras provide a histogram feature whereby you can see a digital analysis of your photo immediately post-shoot and determine whether it was underexposed or overexposed. But how do you look at the histogram graph and figure out what's wrong with the image and how to correct it?
Analyzing the Histogram
A histogram on a digital camera is simply a graphical representation of all the pixels in a particular photo, where the vertical axis represents the number of pixels, and the horizontal axis represents the brightness value - the left-most part of the horizontal axis is pure black (0 brightness) with the far right part being pure white (255 brightness). You may be more familiar with the histogram if you have used the "Levels" editing option in some of the Adobe software applications.
It is important to note that the entire horizontal axis represents only 5 f/stops worth of brightness, which explains why cameras cannot expose scenes with high contrast the same way we humans can see it. Thus, the importance of using the histogram: it is a tool that warns you whether you've over or underexposed a photo.
It is also important to note that if you divide the horizontal axis into 5 zones - one for each f/stop represented, that the number of tonal values available in each f/stop zone of the histogram is not equal. In fact, the zone to the farthest right that represents the brightest tonal values captures the same number of tonal values as that of the other four zones put together!
The Ideal Histogram
In order to have detail show up in dark and light areas in a photo, and to have a photo with depth, you want to expose to the right of the histogram as far as possible without clipping highlights (as shown with a right bar on the right margin of the histogram). Otherwise, your photo's tones will be represented by fewer levels, which negatively impacts tonal smoothness and adds noise, especially in dark areas.
Underexposed Histogram
An underexposed image shows the left-most part of the histogram vertical against the upper left edge of the histogram boundary (or even left-dominated, touching the left boundary at anywhere but 0). We say that the dark end of the histogram is "clipped" because the graph is cut off prematurely on the left edge. Remember that very few tonal values are captured towards the left end of the histogram, so very little detail will be visible in the dark areas of the photo.
In general, to correct an underexposed image, you can make one or more of the following changes to your camera settings and retake the shot:
1) decrease your shutter speed to let in more light (e.g. change 1/8th second to 1/4th second)
2) decrease your aperture (e.g. change f/8 to f/5.6)
3) increase your ISO (e.g. change ISO 200 to ISO 400)
Overexposed Histogram
An overexposed image shows the right-most part of the histogram vertical against the upper right edge of the histogram boundary. We say that the light end of the histogram is "clipped" because the graph is cut off prematurely on the right edge. Such a histogram maps to a photo that is overexposed, and has lost detail in the lightest areas of the image.
In general, to correct an overexposed image, you can make one or more of the following changes to your camera settings and retake the shot:
1) increase your shutter speed to let in more light (e.g. change 1/250th second to 1/500th second)
2) increase your aperture (i.e. change f/5.6 to f/8)
3) decrease your ISO (i.e. change ISO 400 to ISO 200)
Properly Exposed Histogram for a low-key photo (i.e. mostly dark - perhaps the moon at night)
When a photo is composed of things that are mostly very dark in shade, then we call it a low-key photo. Such photos will have a histogram with the left end dominated. It can be challenging to capture such an image with low contrast and without underexposing - the histogram would show it's left edge being clipped if the photo is underexposed. An example of a low-key image would be the proverbial black cat at night.
Properly Exposed Histogram for a high-key photo (i.e. mostly light - perhaps a snow scene)
When a photo is composed of things that are mostly very light in shade, then we call it a high-key photo. These photos will have a histogram with the right end dominated. It can be challenging to capture such an image with low contrast and without overexposing - the histogram would show it's right edge being clipped if the photo is overexposed. An example of a high-key image would be a snowman in the snow.
To see the original Histogram article, complete with sample images, or to read more photography articles, please visit Jennifer Clarkson's website at http://www.jclarksonphotography.com. To learn more about the books in her eSeries on Digital Photography, please visit the following sites: |
Featured digital camera repair Items
Bushnell Elite 10x42 Waterproof/Fogproof PC3 Magnesium Binocular
Bushnell Elite 10x42 Waterproof/Fogproof PC3 Magnesium Binocular
Bushnell's new Elite® series truly lives up to its name. Using over 50 years of optics expertise, we’ve engineered from the ground up to create a completely new binocular. Superior quality BaK-4 roof prisms with PC-3® phase coating. 100% waterproof/fogproof/dustproof design with Rainguard® coating. A rugged, lightweight magnesium chassis. And most impressive of all, lens and prism are fully multi-coated with our exclusive XTR technology to deliver outstanding color fidelity and equally amazing 90% light transmission, the highest in its class. Birders, game hunters and outdoor enthusiasts will enjoy stunningly bright, clear, sharp and colorful images, even in the lowest light conditions. Is this the ultimate premium-performance binocular? Well, there’s always room for improvement. In this case, about .00001%
Olympus Magellan 10x25 WP I Binocular
Olympus Magellan 10x25 WP I Binocular
The new Magellan WP I series of binoculars is a high-performance, compact, easy-to-use, water-proof, fog-proof, and dirt-proof line built for relentless visual performance in severe outdoor conditions. The binoculars come in two magnifications, 8x25 and 10x25, and combine superior visual performance with minimal size and weight, making them a must have item for any outdoor enthusiast.There is definitely no trade-off between image quality and durability with the Magellan series, as all lenses and prisms are fully multi-coated for maximum brightness and contrast, and high refractive index BaK4 prisms assure bright, crisp, edge-to-edge imaging. The Magellan WP I series of binoculars offer superior eye protection with Olympus special optical materials used to reduce the transmission of harmful UV rays. A built-in dioptric correction that adjusts to each user's individual eyesight ensures that viewers will always see action clearly. The Magellan WP I binoculars offer long eye relief, which refers to the maximum distance from the eyepiece lens at which the entire image can be seen. The high number ensures that users will be able to see the entire image through the binoculars even with glasses on. The Magellan WP I binoculars are extremely compact in size, yet durable enough to withstand the elements and the needs of mountain-climbers and water-sport enthusiasts alike. The WP I series are lighter, smaller, and therefore easier to carry than the original Magellan EXWP I series, making them ideal for mountaineering, kayaking, and other outdoor activities where gear must be kept to a minimum.The new Magellan WP I series are fully water-proof to a depth of one meter, perfect for use during any outdoor, on-water endeavors. The binoculars' hermetically sealed and nitrogen gas-filled lens system assures waterproof, fog-proof and dirt-proof performance under extreme weather conditions, and prevents mold from growing during long-term storage.
Customer Review: Nice Binoculars
I have used and wasted alot of money on different compact binoculars like some of you have already. These have the clearest, brightest view of any of them. Time will only tell the long time sturdyness of them, but they appear to be very sturdy and well made. There easy to handle and adjust. Thumbs up for these binoculars
Customer Review: Best ones I've owned
I've had season tickets to theater and sporting events for over a decade and these are the best (of approximately 4 sets) binoculars I've had (of the same size). They are twice as expensive as some of the others - so I would expect some improvement. However, I cannot address the durability issue yet, and this was a major concern with two of my previous sets of binoculars. I keep them in my car and they seem to get permanently damaged from the car movement after a few years.
Bushnell H2O 10x25 Waterproof/Fogproof w/Rainguard Binocular (Camouflage)
Bushnell H2O 10x25 Waterproof/Fogproof w/Rainguard Binocular (Camouflage)
Like the name says, these binoculars are made for water. Splash them, soak them, dunk them - and they'll emerge 100% fog free and dry inside. Perfect for skiers, snowmobilers, anglers and kayakers. True waterproof construction and a rugged, non-slip rubber design makes the H2O series a simple choice for those whose lifestyle borders on the hyper side of active. Take them with you - everywhere.PRODUCT FEATURES: BaK-4 roof prisms for bright, clear, crisp viewing;Multi-coated optics for superior light transmission and brightness;Waterproof: O-ring sealed and nitrogen-purged for 100% reliable, fog-free performance;Large center focus knob for easy, precise adjustments;Non-slip rubber armor absorbs shock while providing a firm grip.
Customer Review: Good glasses to have in the canoe
My goal was to have an relatively inexpensive pair of binoculars to have with me in my canoe whenever I paddle. This pair has filled that need admirably. For my purpose the waterproof feature was necessary. The small lens lets in plenty if light during the day so that has not been a problem; I suppose there is a point towards getting dark that these would not work well but a better larger lens pair would, but certainly not at this price. I would like a slightly larger field of vision, and perhaps more weight would make holding them steady easier, but as noted for my use these are fine; mainly getting a better look at birds in the distance. Small and light makes them easy to keep around.
Canon BP511A 1390mAh Lithium Ion Battery Pack for Select Digital Cameras and Camcorders
Canon BP511A 1390mAh Lithium Ion Battery Pack for Select Digital Cameras and Camcorders
powers select Canon digital cameras and camcorders * rated at 7.4V, 1390mAh * 1-9/16"W x 2-3/16"H x 7/8"D * weight: 2.9 oz. * warranty: 30 days
Customer Review: Small but mighty
The Canon BP511A 1390mAh Lithium Ion Battery rocks. If you shoot with the grip, fabulous! If you just want one as a backup so that you can shoot longer, fabulous! In short, fabulous!
Customer Review: It works
Don't waste your time with the fake batteries. I bought a Targus clone for my 20D and the battery died within a year. Targus support is ignoring me. I should have just stuck with Canon batteries from the very start.
Current digital camera repair News
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Wed, 06 Aug 2008 18:00:47 -0700
This is a simple and easy to use digital camera. It isn’t expensive and takes good quality images. It is for point-and-shoot purpose and for people who want to use the digital technology at a low price. This is a entry-level model from Sony and does a good job as a digital camera in its class. Design: The camera has a simple designing and the build is rectangular which has silver metal touch finishing. The camera weighs 140 grams, which is convenient enough to carry around easily. The size is
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July 31, 2008 -- Nikon is pleased to announce a buffer memory expansion service for the D3 Digital SLR camera.
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Labels: samsung camera | digital camera accessory | internet camera
The Best digital camera repair Articles on Wine
Photography 101: Reading your Camera's Histogram
Many digital cameras provide a histogram feature whereby you can see a digital analysis of your photo immediately post-shoot and determine whether it was underexposed or overexposed. But how do you look at the histogram graph and figure out what's wrong with the image and how to correct it?
Analyzing the Histogram
A histogram on a digital camera is simply a graphical representation of all the pixels in a particular photo, where the vertical axis represents the number of pixels, and the horizontal axis represents the brightness value - the left-most part of the horizontal axis is pure black (0 brightness) with the far right part being pure white (255 brightness). You may be more familiar with the histogram if you have used the "Levels" editing option in some of the Adobe software applications.
It is important to note that the entire horizontal axis represents only 5 f/stops worth of brightness, which explains why cameras cannot expose scenes with high contrast the same way we humans can see it. Thus, the importance of using the histogram: it is a tool that warns you whether you've over or underexposed a photo.
It is also important to note that if you divide the horizontal axis into 5 zones - one for each f/stop represented, that the number of tonal values available in each f/stop zone of the histogram is not equal. In fact, the zone to the farthest right that represents the brightest tonal values captures the same number of tonal values as that of the other four zones put together!
The Ideal Histogram
In order to have detail show up in dark and light areas in a photo, and to have a photo with depth, you want to expose to the right of the histogram as far as possible without clipping highlights (as shown with a right bar on the right margin of the histogram). Otherwise, your photo's tones will be represented by fewer levels, which negatively impacts tonal smoothness and adds noise, especially in dark areas.
Underexposed Histogram
An underexposed image shows the left-most part of the histogram vertical against the upper left edge of the histogram boundary (or even left-dominated, touching the left boundary at anywhere but 0). We say that the dark end of the histogram is "clipped" because the graph is cut off prematurely on the left edge. Remember that very few tonal values are captured towards the left end of the histogram, so very little detail will be visible in the dark areas of the photo.
In general, to correct an underexposed image, you can make one or more of the following changes to your camera settings and retake the shot:
1) decrease your shutter speed to let in more light (e.g. change 1/8th second to 1/4th second)
2) decrease your aperture (e.g. change f/8 to f/5.6)
3) increase your ISO (e.g. change ISO 200 to ISO 400)
Overexposed Histogram
An overexposed image shows the right-most part of the histogram vertical against the upper right edge of the histogram boundary. We say that the light end of the histogram is "clipped" because the graph is cut off prematurely on the right edge. Such a histogram maps to a photo that is overexposed, and has lost detail in the lightest areas of the image.
In general, to correct an overexposed image, you can make one or more of the following changes to your camera settings and retake the shot:
1) increase your shutter speed to let in more light (e.g. change 1/250th second to 1/500th second)
2) increase your aperture (i.e. change f/5.6 to f/8)
3) decrease your ISO (i.e. change ISO 400 to ISO 200)
Properly Exposed Histogram for a low-key photo (i.e. mostly dark - perhaps the moon at night)
When a photo is composed of things that are mostly very dark in shade, then we call it a low-key photo. Such photos will have a histogram with the left end dominated. It can be challenging to capture such an image with low contrast and without underexposing - the histogram would show it's left edge being clipped if the photo is underexposed. An example of a low-key image would be the proverbial black cat at night.
Properly Exposed Histogram for a high-key photo (i.e. mostly light - perhaps a snow scene)
When a photo is composed of things that are mostly very light in shade, then we call it a high-key photo. These photos will have a histogram with the right end dominated. It can be challenging to capture such an image with low contrast and without overexposing - the histogram would show it's right edge being clipped if the photo is overexposed. An example of a high-key image would be a snowman in the snow.
To see the original Histogram article, complete with sample images, or to read more photography articles, please visit Jennifer Clarkson's website at http://www.jclarksonphotography.com. To learn more about the books in her eSeries on Digital Photography, please visit the following sites: |
Featured digital camera repair Items
Bushnell Elite 10x42 Waterproof/Fogproof PC3 Magnesium Binocular
Bushnell Elite 10x42 Waterproof/Fogproof PC3 Magnesium Binocular
Bushnell's new Elite® series truly lives up to its name. Using over 50 years of optics expertise, we’ve engineered from the ground up to create a completely new binocular. Superior quality BaK-4 roof prisms with PC-3® phase coating. 100% waterproof/fogproof/dustproof design with Rainguard® coating. A rugged, lightweight magnesium chassis. And most impressive of all, lens and prism are fully multi-coated with our exclusive XTR technology to deliver outstanding color fidelity and equally amazing 90% light transmission, the highest in its class. Birders, game hunters and outdoor enthusiasts will enjoy stunningly bright, clear, sharp and colorful images, even in the lowest light conditions. Is this the ultimate premium-performance binocular? Well, there’s always room for improvement. In this case, about .00001%
Olympus Magellan 10x25 WP I Binocular
Olympus Magellan 10x25 WP I Binocular
The new Magellan WP I series of binoculars is a high-performance, compact, easy-to-use, water-proof, fog-proof, and dirt-proof line built for relentless visual performance in severe outdoor conditions. The binoculars come in two magnifications, 8x25 and 10x25, and combine superior visual performance with minimal size and weight, making them a must have item for any outdoor enthusiast.There is definitely no trade-off between image quality and durability with the Magellan series, as all lenses and prisms are fully multi-coated for maximum brightness and contrast, and high refractive index BaK4 prisms assure bright, crisp, edge-to-edge imaging. The Magellan WP I series of binoculars offer superior eye protection with Olympus special optical materials used to reduce the transmission of harmful UV rays. A built-in dioptric correction that adjusts to each user's individual eyesight ensures that viewers will always see action clearly. The Magellan WP I binoculars offer long eye relief, which refers to the maximum distance from the eyepiece lens at which the entire image can be seen. The high number ensures that users will be able to see the entire image through the binoculars even with glasses on. The Magellan WP I binoculars are extremely compact in size, yet durable enough to withstand the elements and the needs of mountain-climbers and water-sport enthusiasts alike. The WP I series are lighter, smaller, and therefore easier to carry than the original Magellan EXWP I series, making them ideal for mountaineering, kayaking, and other outdoor activities where gear must be kept to a minimum.The new Magellan WP I series are fully water-proof to a depth of one meter, perfect for use during any outdoor, on-water endeavors. The binoculars' hermetically sealed and nitrogen gas-filled lens system assures waterproof, fog-proof and dirt-proof performance under extreme weather conditions, and prevents mold from growing during long-term storage.
Customer Review: Nice Binoculars
I have used and wasted alot of money on different compact binoculars like some of you have already. These have the clearest, brightest view of any of them. Time will only tell the long time sturdyness of them, but they appear to be very sturdy and well made. There easy to handle and adjust. Thumbs up for these binoculars
Customer Review: Best ones I've owned
I've had season tickets to theater and sporting events for over a decade and these are the best (of approximately 4 sets) binoculars I've had (of the same size). They are twice as expensive as some of the others - so I would expect some improvement. However, I cannot address the durability issue yet, and this was a major concern with two of my previous sets of binoculars. I keep them in my car and they seem to get permanently damaged from the car movement after a few years.
Bushnell H2O 10x25 Waterproof/Fogproof w/Rainguard Binocular (Camouflage)
Bushnell H2O 10x25 Waterproof/Fogproof w/Rainguard Binocular (Camouflage)
Like the name says, these binoculars are made for water. Splash them, soak them, dunk them - and they'll emerge 100% fog free and dry inside. Perfect for skiers, snowmobilers, anglers and kayakers. True waterproof construction and a rugged, non-slip rubber design makes the H2O series a simple choice for those whose lifestyle borders on the hyper side of active. Take them with you - everywhere.PRODUCT FEATURES: BaK-4 roof prisms for bright, clear, crisp viewing;Multi-coated optics for superior light transmission and brightness;Waterproof: O-ring sealed and nitrogen-purged for 100% reliable, fog-free performance;Large center focus knob for easy, precise adjustments;Non-slip rubber armor absorbs shock while providing a firm grip.
Customer Review: Good glasses to have in the canoe
My goal was to have an relatively inexpensive pair of binoculars to have with me in my canoe whenever I paddle. This pair has filled that need admirably. For my purpose the waterproof feature was necessary. The small lens lets in plenty if light during the day so that has not been a problem; I suppose there is a point towards getting dark that these would not work well but a better larger lens pair would, but certainly not at this price. I would like a slightly larger field of vision, and perhaps more weight would make holding them steady easier, but as noted for my use these are fine; mainly getting a better look at birds in the distance. Small and light makes them easy to keep around.
Canon BP511A 1390mAh Lithium Ion Battery Pack for Select Digital Cameras and Camcorders
Canon BP511A 1390mAh Lithium Ion Battery Pack for Select Digital Cameras and Camcorders
powers select Canon digital cameras and camcorders * rated at 7.4V, 1390mAh * 1-9/16"W x 2-3/16"H x 7/8"D * weight: 2.9 oz. * warranty: 30 days
Customer Review: Small but mighty
The Canon BP511A 1390mAh Lithium Ion Battery rocks. If you shoot with the grip, fabulous! If you just want one as a backup so that you can shoot longer, fabulous! In short, fabulous!
Customer Review: It works
Don't waste your time with the fake batteries. I bought a Targus clone for my 20D and the battery died within a year. Targus support is ignoring me. I should have just stuck with Canon batteries from the very start.
Current digital camera repair News
Market Wire - Examine the World Arthroscopes Market
Mon, 07 Jul 2008 07:00:00 GMT
July 7, 2008 -- Reportlinker.com announces that a new market research report related to the Medical devices industry is available in its catalogue. World...
Sony DSC S730 Digital Camera
Wed, 06 Aug 2008 18:00:47 -0700
This is a simple and easy to use digital camera. It isn’t expensive and takes good quality images. It is for point-and-shoot purpose and for people who want to use the digital technology at a low price. This is a entry-level model from Sony and does a good job as a digital camera in its class. Design: The camera has a simple designing and the build is rectangular which has silver metal touch finishing. The camera weighs 140 grams, which is convenient enough to carry around easily. The size is
Nikon Announces D3 Buffer Memory Expansion Service
Fri, 01 Aug 2008 04:34:55 GMT
July 31, 2008 -- Nikon is pleased to announce a buffer memory expansion service for the D3 Digital SLR camera.
cheap security camera
hp cameras
digital camera slr
Labels: samsung camera | digital camera accessory | internet camera
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