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Old May 10, 2013, 7:53 AM   #1
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Default What causes pixelation in the sky portion of my shots(sometimes)

Here are four examples, the last in B&W:
http://frodge.smugmug.com/Other/Bicy...IMG_1289-L.jpg

http://frodge.smugmug.com/Other/Bicy...IMG_1308-L.jpg

http://frodge.smugmug.com/Other/Bicy...IMG_1141-L.jpg

http://www.etsy.com/listing/12899196...allery_18#zoom
I'm wondering if you see what I see. They are apparent in my LCD laptop but I cannot see them on my iphone. Let me know if you see te problem in te sky portion and why causes it and how to fix it. It does not happen all the time and is irregardless to aperture.

Last edited by Heinrich Hausler; May 10, 2013 at 8:18 AM.
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Old May 10, 2013, 8:13 AM   #2
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Only the last link works, and I don't see any pixelation in the sky.

Pixelation generally occurs when a lower resolution image is displayed on a higher resolution screen. The image needs to be upsampled to accommodate the higher resolution, and doing so on the fly generally requires some shortcuts to improve responsiveness, but it sacrifices quality.

Note that the same pixelation may exist on your iPhone, but the screen is too small for you to discern it.
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Old May 10, 2013, 8:19 AM   #3
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I fixed the links:
The black and white shows in top left corner on my LCD monitor,
The black car shows in the upper top right, and the green car shows in random places. These were shot super fine jpg. The only one that was altered is PS is the lake.
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Old May 10, 2013, 9:12 AM   #4
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Sounds like Posterization... Laptops screens usually don't have the color depth (bit depth) to handle all the
different shades of color so color graduation is displayed in visible "steps"...

http://www.pcmag.com/encyclopedia_te...i=49550,00.asp

http://en.wikipedia.org/wiki/Posterization

Do a Google on Posterization and you'll find tons of info on the subject...
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Old May 10, 2013, 9:19 AM   #5
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Those three images all have a resolution of 800x534. If that's the resolution of the images you're viewing, I don't see the pixelation. If you're looking at images with other resolutions, you should provide links to them.

It's possible that your laptop's LCD screen is set to something other than the hardware resolution.
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