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08/27/2004 05:15:56 PM · #1 |
I realize blown out highlights are created by overexposure, however, does anyone know if in fact, the chip is a contributing factor?
The better I get at printing and post processing, the more I am seeing blown out highlights in my images. I am starting to see a trend of proper exposure, shawdow details etc., however, I'll still see the highlights wash away as an image is tweaked.
Is this a D100 issue and I am beating a dead horse?
Anyone have insight on the specific causes outside of exposure control?
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08/27/2004 05:19:40 PM · #2 |
poor post processing will also blow out highlights.
You have to pay attention to clipping them when you are editing the image, which it sounds like you are doing. In particular contrast adjustments, 'auto contrast', levels etc can all blow highlights if you don't use them carefully.
Some of the tools have specific features to show you the highlights you are clipping - e.g., drag the highlight slider in levels, while pressing 'Alt' to see the per channel clipping that you are doing.
Printing also typically adds some more contrast, so you'll probably see some there - the dynamic range is usually less for paper than is shown on a screen - soft proofing helps somewhat there.
More localised contrast adjustments can help avoid this - for example using curves with a 'double tap' lockdown on the highlights while tweaking just the mid-tones.
Message edited by author 2004-08-27 17:20:34.
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08/27/2004 05:26:41 PM · #3 |
Originally posted by Gordon:
poor post processing will also blow out highlights.
Some of the tools have specific features to show you the highlights you are clipping - e.g., drag the highlight slider in levels, while pressing 'Alt' to see the per channel clipping that you are doing.
More localised contrast adjustments can help avoid this - for example using curves with a 'double tap' lockdown on the highlights while tweaking just the mid-tones. |
Thanks Gordon. These went over my head a bit, but I'm going to try and play w/P.S. tonight on some of the images I have.
I never use "Auto" for the exact reason you stated.
Channel Clipping? Would working 16 bit -v- 8 bit help?
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08/27/2004 05:32:00 PM · #4 |
Originally posted by DJLuba:
Channel Clipping? Would working 16 bit -v- 8 bit help? |
Not really. Any images runs from black 0 to white (max value - 256 for 8 bit, typically still 256 for 16 bit 'externally')
8 bits per channel, vs 16 bits per channel just changes the precision within a 'step' between two colours. It doesn't change where the high point and low point falls. Think of it like two stair cases, both going to the same floor, from the same floor. One just has a lot fewer, and bigger steps (8 bit) the other has a lot more, smaller steps (16 bit)
Channel clipping occurs when you clip the highlights on for example the red channel. You don't always blow the highlights on every colour channel at the same time (that happens with white highlights) but there are also red highlights, blue highlights and green highlights that can be clipped and lose information/ detail.
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