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Showing posts with label quality. Show all posts
Showing posts with label quality. Show all posts

Wednesday, July 13, 2011

Digital Camera Photography Tips

When working with a digital camera instead of a film camera, many of the same operational concepts still apply. Even with basic digital cameras, you usually have the ability to adjust when and how to use the flash and you may be able to force different distance modes for close-up, normal, or landscape settings. Some cameras allow you to manually adjust focus, exposure, or select special filter modes.

Every camera I am familiar with has had the ability to adjust image quality settings, controlling the picture resolution and the type of image format the image is saved in. One big advantage of digital photography over film is expense. Since the memory cards are reusable and most cameras can use rechargeable batteries, you can always take a quantity over quality approach, and delete the less-than-satisfactory results.

Check the manual or CD that came with your camera; if you don't know where it is, use the Internet to check the manufacturer's site for a downloadable version. The user manual will not only help explain what features are available on your camera, but almost always includes examples or suggestions for using a particular feature.

[caption id="attachment_276" align="aligncenter" width="253" caption="Check out your camera vendor's web site for photography tips, tutorials, or examples of how to use your camera for the best results."]Check online for help[/caption]

Framing the image
Knowing the basic functions of the camera is always important If you want to achieve the best results in the pictures you take. Although, when going beyond the operational features of the camera, don't lose sight of simple photographic principles. Many issues can be corrected in a graphics editing program, but procedures like image cropping reduce the amount of data in the image, losing detail as a result. Taking a few extra moments to minimize or eliminate issues will result in better images and less work.

Photo example

[caption id="attachment_279" align="aligncenter" width="223" caption="Taking time to frame your subject can avoid having to remove unwanted portions later. Aiming the camera slightly lower removes the background clutter, keeping the focus on the spring flowers - without losing detail or changing the aspect ratio of the image."]Photo example[/caption]

[caption id="attachment_280" align="aligncenter" width="300" caption="Including objects in the frame that create natural borders can direct the viewer's focus and make the picture more interesting."]Photo example[/caption]

Photo example

[caption id="attachment_282" align="aligncenter" width="300" caption="Other approaches to framing include balancing the points of interest in the picture by "thirds"."]Photo example[/caption]


Flash photography
Adjusting the operation of the camera's strobe can also make a difference in many of your images. If left in automatic mode, the strobe will flash in any low-light conditions. By forcing the camera to use the strobe, you can sometimes improve the lighting of nearby objects or subjects showing deep shadows. By disabling the strobe, you force the camera to adjust exposure settings to the existing light conditions, including the high-contrast dark shadows that may result.





















Auto flash


Most digital cameras with a built-in flash are set to automatically use it as a fill-flash. In moderate light, the strobe may flash to increase the lighting level of foreground objects and reduce shadows. In low-light conditions, a strobe is required to prevent motion blurring from holding the camera at slower exposure speeds. In automatic mode, the strobe may not flash at all in full sunlight or under bright lighting.

Special flash


Special flash modes like red-eye flash, can minimize the chance of having your subject's eyes reflecting the flash back to the camera by giving a short pre-flash, causing their pupils to contract before the real flash goes off.

No flash


By turning off the flash, you will force your camera to adjust the "shutter speed" to as long as it needs for the sensor to reach a range of values it considers correct. In low light conditions, this could easily mean that your image will be out of focus or blurred because of very slight camera motion. The easy work-around is to use a tripod. Digital cameras are capable of recording night shots or images in minimal lighting.

Full flash


By turning on full flash, your strobe will fire every time, even in bright sunlight. When taking outdoor pictures, the result is a fill-flash that reduces deep shadows on your close-range subjects. Without the flash, you will have bright highlights and very dark shadows, with very little midrange values.


 




[caption id="attachment_291" align="aligncenter" width="300" caption="Choosing when (what time of day) to take pictures, and deliberately using a flash can result in high-contrast compositions. For example, by waiting until dusk or full dark, a snapshot of spring flowers becomes a high-contrast composition."]Photo example[/caption]

 


Focus and depth of field
One aspect of digital photography that is often overlooked is the depth of field. This is the term applied to the distance range that is in focus of the camera at the time the photo is taken. As with the flash, the default focus setting on most digital cameras is also automatic. Typically, there will be a set of brackets near the center of your LCD screen or viewfinder that identifies the portion of the image that the camera will attempt to focus on when you press the shutter button part way down.

You can usually use the focus feature to lock on a subject that is not positioned in the brackets when you take the picture. Position the subject in the brackets and press the shutter button part way to have the camera set the focus distance; while still holding the shutter button down, reposition the camera the way you wish and press the button the rest of the way to take the picture. Holding the button part way down, should "lock" the focus at the distance to the subject, keeping them sharp, even if close and distant objects blur.

A few cameras will automatically adjust into close-up mode (sometimes called "macro"), although some require the user to change the capture mode to enable this feature. Close up or macro mode usually allows the camera to focus on objects only within a very close distance to the camera lens. Strobes may be disabled when working in macro mode on some cameras. If this is the case, you may need alternative lighting or a tripod to steady the camera.





















Auto focus


Automatic Focus: The camera will attempt to bring the image into focus using the bracketed area of the viewfinder. Newer cameras may be able to adjust over the entire range of distance from a couple of inches all the way out to "infinity" (or at least "way-over-there".)

Macro setting


Close Up Mode: The camera has a very restricted range that it can focus on. For example, the HP Photosmart M437 has a close-up range that operates from about 2 inches to a maximum of about 12 inches. Anything that is in the frame outside of this focal range will appear out of focus.

Portrait mode


Portrait Mode: When a camera is configured to use this setting, it will not attempt to focus close-up. The typical focus range would typically be from several feet to no more than 20-30 feet. Both extremely close and distant objects may be slightly out of focus at this setting.

Landscape mode


Landscape Mode: When configured in landscape, objects that are far away will always be in focus. Depending on the lens and optics of your camera, objects as close as 15 to 20 feet will probably be in focus; while objects will become blurry the closer they are to the camera.


 




[caption id="attachment_297" align="aligncenter" width="300" caption="In close-up mode, only objects very close to the camera will be in focus. Objects will get more and more out of focus the further away they are from the camera. (This one could use some attention to framing - a slight rotation would have removed the car in the background.)"]Photo example[/caption]

[caption id="attachment_298" align="aligncenter" width="300" caption="To bring objects into focus that are further apart than the close-up mode range, try backing away and use the optical zoom of your camera. The depth of field in zoom mode can easily be 3-4 times deeper than the close-up range."]Photo example[/caption]

A common trick with zoom is to back off far enough that your "close objects" are in focus as well as very distant objects. Remember this when you want to take a picture of something or someone silhouetted against the setting sun or a full moon. Usually, you should be able to get everything from 20 feet out or more to be in sharp focus at the same time.

To get the sun or moon to fill the view, you are going to need more than the typical 3x to 5x zoom found on most cameras. After-market Zoom and telephoto lenses that attach to the front of your camera may help, but will rarely equal the quality of a quality lens designed for the purpose. High-end cameras with interchangeable lenses can support high-magnification telephoto or the zoom lenses as desired. You may even be able to find telescope adapters for some models.

ExposureExposure settings and special modes
Many cameras will have ISO modes that allow the user to adjust the exposure time required, which can be useful, especially under low light conditions. As the ISO number increases, so does the "shutter speed" of the camera at a given light level. This can reduce blurring due to camera motion or to movement by your subject.












Shutter speed


If you don't find ISO (film speed) settings in the camera menus, you may have a shutter mode for "action" or something similar. These modes usually will decrease the exposure time required to capture an image, to reduce blurring of the subject.

Stablization


Your camera may also have some sort of electronic stabilization feature that can compensate for minor vibration or shaking of the camera as you snap a picture. If you do not have such a feature, you may need to use a tripod or brace your camera against something solid.

Often, cameras have one or more special modes for use in certain situations or for particular types of photography. These may act like color lens filters -- to enhance certain colors, disable the flash -- but reduce the exposure time, or set some other combination of features. Check your manual to find out how to activate these settings, and what the features your camera may include.




















Burst mode


Burst mode - rapidly take three pictures in a row. This is useful for capturing action or fast moving subjects that move in and out of frame quickly. Some cameras may have a similar "bracketed mode" option that adjusts the exposure slightly over three images. This results in three pictures with slightly different lighting levels, equivalent to one f-stop either way from the optimal setting. This is useful for capturing high-contrast images, where the optimal image may be too bright or too dark to distinguish details.

Night mode


Night portrait mode - Enables the flash for close up, but takes a long exposure to capture detail in low-light conditions. A tripod is required.

Theater mode


Theater mode - Disable the strobe and keep exposure times short to minimize blurring in low-light conditions.

Sunset mode


Sunset mode - Enhances warm colors like yellow, orange and red, similar to a "warming" lens filter.




[caption id="attachment_308" align="aligncenter" width="300" caption="To bring objects into focus that are further apart than the close-up mode range, try backing away and use the optical zoom of your camera. The depth of field in zoom mode can easily be 3-4 times deeper than the close-up range."]Photo example[/caption]

Quality settings
Don't forget your image quality settings. These limit the resolution of your images and the amount of detail that will be visible. If you are planning to print out the captured images on a printer, you want as much detail as possible in the image, so that a sharper photo can be produced.

Choosing a lower resolution or quality setting will allow you to pack more images on the memory card, but always by sacrificing detail. Cropping and digital zoom also reduce the level of detail available in your final image, but starting with the highest possible quality setting may offset these operations somewhat.

The highest setting for your camera may also be a non-standard one. If your choices of quality settings were "low", "medium", "high" or "raw", the camera may compress the image using a JPEG image format on all settings except "raw". The "raw" setting may save the image as an uncompressed TIFF image or as some sort of proprietary uncompressed format that will require you to use software that came with the camera to convert it to some other format before printing or editing.

Wednesday, July 6, 2011

How could an LCD display be blurry or out of focus?

Look around, more users than ever have Liquid Crystal Displays (LCDs), not Cathode Ray Tube (CRT) displays on their desks. These desktop versions of laptop LCD displays use less power than a CRT display of the same size, and provide high-contrast and brilliant color images all in a slim, high-tech package.

Just as features and styles vary from vendor to vendor, the appearance and quality of the displays will also differ. But if you have a new flat screen display that does not appear to be as sharp and clear as the CRT or older LCD it replaced, take a moment to check the basic settings. For the best possible video display, you will have to check both your computer's display settings and the flat panel display settings.

CRT Display

[caption id="attachment_239" align="alignnone" width="200" caption="Close up views of text displayed on a CRT (top) and LCD (bottom)"]LCD Display[/caption]

Native mode
Make sure the computer's display settings are set to the maximum resolution the flat panel screen supports. The maximum resolution of the flat panel display is called the "Native Mode" of the display, and will provide the clearest, sharpest possible match between the physical configuration of the LCD panel and your video card's signal.Early LCD displays had a single group of one red, green, and blue dots or pixels physically in the display that could be addressed by the display adapter in the computer. If a flat screen display had 1920 groups of RGB elements across the display and 1080 elements from top to bottom, then the native resolution of the display is 1920x1080. (This is also the current highest HDTV broadcast standard and may be identified as 1080i - for interlaced, or 1080p for progressive scan.)

When you set the video display for any resolution other than 1920x1080, the number of elements being displayed does not match the number of elements physically available in the screen. This results in a jagged or blocky appearing image on your screen. Lower resolution settings must either average the missing pixels, or ignore some of the data entirely; this can result in missing lines, or choppy-looking text in the worst case scenario.

Every flat panel screen has an optimal resolution where the image will appear the sharpest. Refer to your documentation for this resolution, and then adjust your display properties to this setting. If the Plug-and-play detection is supported and working properly between your system and the display, Windows will usually limit the maximum supported resolution to the native mode of your monitor.

Flat panel display adjustments
If the video display adapter properties are already set to the optimal mode for the display, and the image still appears blurry or out of focus, then the problem is most likely that the flat panel display is out of adjustment. While you could manually alter the display width, height, horizontal and vertical position of the image, most displays have an automatic adjustment feature.

A flat screen monitor will have several adjustments that you can make using the buttons or on-screen-display (OSD) menus. While many of the displays now auto-configure to your video signal when powered on or when the settings change, not all of the displays will. You should be aware that this feature is not tied to any one manufacturer, price range, or screen size.

Even if a display does not auto-configure automatically, most will have this feature available in the On-Screen-Display menus, where you can manually start the process. The auto configure feature should adjust the display width and height out to the physical edges of the display. There is no wasted space on an LCD display unlike a CRT that uses a shadow mask or where the picture tube extends behind the plastic bezel of the screen. "Auto Adjust" may also change your backlight brightness, display contrast, and color correction from the available display settings supported.

While it does not directly affect the sharpness, flicker can be annoying in your display. Refresh rates of 60 Hertz and less are the most common reason for flicker. Whether you have a choice in adjusting this may be a limitation of the display adapter, the flat panel monitor, or both. Some flat panel monitors only operate at a 60Hz refresh rate, however most new displays can support 70, 72, or 75Hz refresh rates. But it is your video adapter that must produce the signal for the monitor, and this is what must be adjusted to the higher refresh rate to benefit.

In Windows XP, enter Display properties from the control panel or by right-clicking on the desktop and selecting "properties", click on the "properties" tab then click on "advanced". Examine the monitor settings for refresh rate, although this should have been tied to the Plug-And-Play capabilities when the monitor was detected. You can try adjusting the refresh rate manually to see if this reduces flicker, although you may have to repeat the Auto-Adjust process if you make changes.

[caption id="attachment_240" align="alignnone" width="300" caption="All those colors blur together to make the background appear white to our eye. Under magnification, you can see not only the individual red, green, and blue sub-pixes of the LCD display, but also the blurring effect of font smoothing."]Screen zoom[/caption]

All those colors blur together to make the background appear white to our eye. Under magnification, you can see not only the individual red, green, and blue sub-pixes of the LCD display, but also the blurring effect of font smoothing.

ClearType
ClearType is a software technology developed by Microsoft back in 2000 to enhance the appearance and readability of text on LCD displays. It is a standard feature in Windows XP, Vista and Windows 7 as well as specific applications like their Microsoft Reader (ebook) software. Like anti-aliasing, ClearType sacrifices sharpness (each pixel being on or off) and smooths the edges of fonts in an LCD display by addressing the individual red, green, or blue sub-pixels. (Anti-aliasing can only smooth edges at the pixel level, so all red, green, and blue components of the pixels would be affected.) Read more about ClearType on the Microsoft site; search for "ClearType" or go to http://www.microsoft.com/typography/cleartypeinfo.mspx

Windows does not automatically turn on its ClearType feature to smooth the edges of fonts. When using a CRT, where the pixel groups are typically much smaller than the display resolution, "Standard" smoothing will make your display more readable. But with an LCD Display, ClearType should make a big difference in readability.

ClearType under Windows XP:

1. To enable ClearType under Windows XP open display properties from the Control Panel or by right-clicking on your desktop.

Appearance menu

2. Select the Appearance tab, and click on the Effects button.

Appearance tab

3. Select ClearType for font smoothing if you have an LCD display.
4. Click OK to save changes in each window.

ClearType under Windows 7:

1. Open Display properties from the Control Panel.

Display properties

2. In the navigation bar, look for Adjust ClearType text; click on the link to launch the ClearType Text Tuner wizard.

ClearType Text Tuner Wizard

3. If you use an LCD screen, make sure there is a check in the Turn on ClearType box. Click Next.

Turn on Clear Type

4. Windows 7 should check to make sure your display is set to the native resolution of the LCD monitor. Click Next.

Select native resolution

5. The ClearType Text Tuner will display four screens of text to compare. In each screen, choose the box that looks sharpest to you. NOTE: If you have not done an auto-adjust of your monitor, do this before choosing from the screens. You can always repeat this process at any time if you think the screen still looks bad, or turn off ClearType at the first screen. Click Next to complete each selection, then click Finish when done.

Monday, May 9, 2011

How to Use the Graphic Equalizer in Windows Media Player 12

This guide shows you how to use the graphic equalizer to adjust audio output frequencies in Windows Media Player 12.

  1. Right-click anywhere in Windows Media Player, then click on Enhancements. Select Graphic Equalizer.

    Open Graphic Equalizer panel

    If the graphic equalizer is turned off, click Turn on.

    Turn on settings

  2. You will have a number of options available to you at this point. On the left are three settings that control how the sliders move.

    Settings adjustments

    Settings options

    Settings options

    They can move independently, as a loose group or a tight group.These settings become important if you are doing a custom setting on the graphic equalizer.

  3. At the top is a selection of preset settings for the equalizer.

    Default options

  4. Click the currently selected preset to display the full list.

    Preset options

  5. Select the preset you want or click Custom at the bottom if you wish to adjust the settings manually. If you choose Custom move the sliders to the position you desire.
  6. Which ever setting you choose a preset or a custom setting, the changes take effect immediately.