Showing posts with label kamera. Show all posts
Showing posts with label kamera. Show all posts
Thursday, October 21, 2010
Brand New Nikkor 80-200mm f/2.8 RM3500
Price : RM3500
FOC shipping witin peninsular malaysia
for booking please call
0124436143
0195112662
MZAIDI Technology
http://digitalgadgets2u.com
Wednesday, October 20, 2010
Brand New Canon 60d
Price : RM3050 (BODY ONLY)
for booking please call
0124436143
0195112662
MZAIDI Technology
http://digitalgadgets2u.com
Friday, February 27, 2009
Wednesday, December 3, 2008
White Balance
Color Temperature
Most light sources are not 100% pure white but have a certain "color temperature", expressed in Kelvin. For instance, the midday sunlight will be much closer to white than the more yellow early morning or late afternoon sunlight. This diagram gives rough averages of some typical light sources.
Type of Light
Color Temperature in K
Candle Flame
1,500
Incandescent
3,000
Sunrise, Sunset
3,500
Midday Sun, Flash
5,500
Bright Sun, Clear Sky
6,000
Cloudy Sky, Shade
7,000
Blue Sky
9,000
Latest News
Just posted! Tamron 18-270mm VC lens review
Nikon unveils 24.5MP D3X digital SLR
Budget Compact Camera Group Test
Panasonic - new flash and firmware for DMC-LX3
Just Posted! Canon Powershot G10 review
Adobe updates Camera Raw for CS4
Canon US video and printer rebate glitch
Kodak challenges Samsung and LG on patents
Sony develops CMOS sensor for phones
Just posted! Pentax 50mm F1.4 lens review
Sigma buys sensor developer Foveon
Samsung Techwin to spin-out camera division
Sigma DP1 Firmware Update
Phase One releases Capture One v4.5.1
dpreview.com blog
White Balance
White BalanceBy Vincent Bockaert
Color TemperatureMost light sources are not 100% pure white but have a certain "color temperature", expressed in Kelvin. For instance, the midday sunlight will be much closer to white than the more yellow early morning or late afternoon sunlight. This diagram gives rough averages of some typical light sources.
Type of Light
Color Temperature in K
Candle Flame
1,500
Incandescent
3,000
Sunrise, Sunset
3,500
Midday Sun, Flash
5,500
Bright Sun, Clear Sky
6,000
Cloudy Sky, Shade
7,000
Blue Sky
9,000
White Balance
Normally our eyes compensate for lighting conditions with different color temperatures. A digital camera needs to find a reference point which represents white. It will then calculate all the other colors based on this white point. For instance, if a halogen light illuminates a white wall, the wall will have a yellow cast, while in fact it should be white. So if the camera knows the wall is supposed to be white, it will then compensate all the other colors in the scene accordingly.
Most digital cameras feature automatic white balance whereby the camera looks at the overall color of the image and calculates the best-fit white balance. However these systems are often fooled especially if the scene is dominated by one color, say green, or if there is no natural white present in the scene as show in this example.
The auto white balance was unable to find a white reference, resulting in dull and artificial colors.
The auto white balance got it right this time in a very similar scene because it could use the clouds as its white reference.
Most digital cameras also allow you to choose a white balance manually, typically sunlight, cloudy, fluorescent, incandescent etc. Prosumer and SLR digital cameras allow you to define your own white balance reference. Before making the actual shot, you can focus at an area in the scene which should be white or neutral gray, or at a white or gray target card. The camera will then use this reference when making the actual shot.
Most light sources are not 100% pure white but have a certain "color temperature", expressed in Kelvin. For instance, the midday sunlight will be much closer to white than the more yellow early morning or late afternoon sunlight. This diagram gives rough averages of some typical light sources.
Type of Light
Color Temperature in K
Candle Flame
1,500
Incandescent
3,000
Sunrise, Sunset
3,500
Midday Sun, Flash
5,500
Bright Sun, Clear Sky
6,000
Cloudy Sky, Shade
7,000
Blue Sky
9,000
Latest News
Just posted! Tamron 18-270mm VC lens review
Nikon unveils 24.5MP D3X digital SLR
Budget Compact Camera Group Test
Panasonic - new flash and firmware for DMC-LX3
Just Posted! Canon Powershot G10 review
Adobe updates Camera Raw for CS4
Canon US video and printer rebate glitch
Kodak challenges Samsung and LG on patents
Sony develops CMOS sensor for phones
Just posted! Pentax 50mm F1.4 lens review
Sigma buys sensor developer Foveon
Samsung Techwin to spin-out camera division
Sigma DP1 Firmware Update
Phase One releases Capture One v4.5.1
dpreview.com blog
White Balance
White BalanceBy Vincent Bockaert
Color TemperatureMost light sources are not 100% pure white but have a certain "color temperature", expressed in Kelvin. For instance, the midday sunlight will be much closer to white than the more yellow early morning or late afternoon sunlight. This diagram gives rough averages of some typical light sources.
Type of Light
Color Temperature in K
Candle Flame
1,500
Incandescent
3,000
Sunrise, Sunset
3,500
Midday Sun, Flash
5,500
Bright Sun, Clear Sky
6,000
Cloudy Sky, Shade
7,000
Blue Sky
9,000
White Balance
Normally our eyes compensate for lighting conditions with different color temperatures. A digital camera needs to find a reference point which represents white. It will then calculate all the other colors based on this white point. For instance, if a halogen light illuminates a white wall, the wall will have a yellow cast, while in fact it should be white. So if the camera knows the wall is supposed to be white, it will then compensate all the other colors in the scene accordingly.
Most digital cameras feature automatic white balance whereby the camera looks at the overall color of the image and calculates the best-fit white balance. However these systems are often fooled especially if the scene is dominated by one color, say green, or if there is no natural white present in the scene as show in this example.
The auto white balance was unable to find a white reference, resulting in dull and artificial colors.
The auto white balance got it right this time in a very similar scene because it could use the clouds as its white reference.
Most digital cameras also allow you to choose a white balance manually, typically sunlight, cloudy, fluorescent, incandescent etc. Prosumer and SLR digital cameras allow you to define your own white balance reference. Before making the actual shot, you can focus at an area in the scene which should be white or neutral gray, or at a white or gray target card. The camera will then use this reference when making the actual shot.
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