Sunset in Kruger

by MrFrench

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18,156 reputation
33669
bio website guffa.com
location Sweden
age 44
visits member for 4 years, 9 months
seen 6 hours ago

The name is Göran Andersson. I work as a programmer and have photography as a hobby.

I started with a fix-focus point-and-pray camera in the late eighties, and have worked my way through film SLRs and darkrooms to the DSLR that I use now.

Primary equipment:

  • Canon EOS 5D mark II
  • Canon EF 24-70 mm, f 2.8 L USM
  • Canon EF 28-135 mm, f 3.5-5.6 IS USM
  • Canon EF 70-300 mm, f 4.5-5.6 DO IS USM
  • Canon EF 50mm, f 1.4
  • Sigma EX 12-24 mm, f 4.5-5.6 DG HSM
  • Sigma EX 50-500 mm, f 4-6,3 APO DG HSM
  • Lensbaby 2.0 + Edge 80
  • Canon Speedlite 550EX
  • Manfrotto 728B tripod
  • Manfrotto 776YB monopod

Apr
11
revised What is the cause of black bars on a photo of AMOLED display?
added 226 characters in body
Apr
11
comment What is the cause of black bars on a photo of AMOLED display?
@Lathejockey81: The display is actually blinking, that's what the PWM is doing. You can see that in the movement in the 1/40s and 1/100s exposures; the buttons at the bottom is captured as a continuous blur, while the screen is captured as separate frames, with a significant blackout between them. You can also see the evidence of the vertical sweep, as the first and last frames start and end in the middle of the frame.
Apr
9
comment What is the cause of black bars on a photo of AMOLED display?
@Lathejockey81: In theory the pixels in an LCD screen could be changed individually, but that's not done. Why? Because it would mean that you would send as much addressing information to the screen as color information, doubling the data that need to be sent to update the screen. A mobile screen is updated just like any other LCD screen, that's why tripple buffering and VSYNC was introduced in Android 4 to make animations smoother.
Apr
9
comment What is the cause of black bars on a photo of AMOLED display?
@DavidBalažic: Yes, it's the rolling shutter in combination with the refresh rate that causes different patterns. The pattern will be multiple bands unless you align the shutter movement with how the screen refresh moves.
Apr
9
revised What is the cause of black bars on a photo of AMOLED display?
added 1 character in body
Apr
7
awarded  Enlightened
Apr
7
awarded  Nice Answer
Apr
6
answered What is the cause of black bars on a photo of AMOLED display?
Apr
1
comment Color issue: studio images have a pink hue
How do you determine that the images have a color shift? Is it possible that it's actually your computer screen that shows them incorrectly?
Mar
31
revised How do I stack two photos in Photoshop to reduce noise?
added 158 characters in body
Mar
31
answered How do I stack two photos in Photoshop to reduce noise?
Mar
31
comment How do I stack two photos in Photoshop to reduce noise?
Stacking images would normaly reduce noise, but if you use the wrong method it could increase the noise. What method are you using?
Mar
31
revised Is it safe to charge a Coolpix S9900 with an Anker 60W USB charger?
added 32 characters in body
Mar
31
answered Is it safe to charge a Coolpix S9900 with an Anker 60W USB charger?
Mar
30
answered What causes this strange Posterization when changing to B&W?
Mar
29
comment What is the real world impact of the lossy compression used for NEF RAW files in some Nikon cameras?
@MichaelClark: The source of the TIFF and the JPEG would be the same, that's the entire point of the comparison. The TIFF would be uncompressed or use lossless compression, otherwise the comparison is totally pointless.
Mar
29
comment What is the real world impact of the lossy compression used for NEF RAW files in some Nikon cameras?
@MichaelClark: Yes, naturally. I assumed (without telling) at least an 8 bit TIFF so that the comparison is at all relevant. A 16 bit TIFF would of course contain more of the original data, but the visual difference would still be small.
Mar
28
comment What is the real world impact of the lossy compression used for NEF RAW files in some Nikon cameras?
@NeilL: Yes, the TIFF file will definitely have better image quality, but most of that will be barely possible to see in most images. The JPEG image for example has brightness information for every pixel, but color information is shared by a 2x2 group of pixels. The TIFF image has color information for each pixel.
Mar
28
revised What is the real world impact of the lossy compression used for NEF RAW files in some Nikon cameras?
deleted 3 characters in body
Mar
28
revised What is the real world impact of the lossy compression used for NEF RAW files in some Nikon cameras?
added 58 characters in body