Reply to thread

Message

<blockquote data-quote="MrF" data-source="post: 168258" data-attributes="member: 10292">To nerd out on this a little more, digital cameras approximate the billions of colors in the real world using three channels (red, green, and blue) with 256 'values' of brightness each (0-255).&nbsp; A pixel will flash on the highlight screen when it hits a value of 255.&nbsp; Some cameras will let you see highlights (and histograms) for each individual channel, some just show you one.&nbsp; I have no idea how the camera comes up with the value for the total histogram, although some folks will tell you that it's just the green channel, and the histograms do look similar to each other.&nbsp; A good example where this can bite you is a sunset.&nbsp; I usually see the 'total' highlights look fine, but the red channel is completely blown out around the sun.&nbsp; If the D90 will let you view the individual channels, I'd get in the habit of checking that.&nbsp; You can also look at the histogram to get a gauge on how much to adjust the exposure.&nbsp; If you have a ton of pixels on the right side (i.e. a value of 255) you'll have to dial in more -EV than if you just had a small spike there.Hope this helps!</blockquote>

[QUOTE="MrF, post: 168258, member: 10292"] To nerd out on this a little more, digital cameras approximate the billions of colors in the real world using three channels (red, green, and blue) with 256 'values' of brightness each (0-255). A pixel will flash on the highlight screen when it hits a value of 255. Some cameras will let you see highlights (and histograms) for each individual channel, some just show you one. I have no idea how the camera comes up with the value for the total histogram, although some folks will tell you that it's just the green channel, and the histograms do look similar to each other. A good example where this can bite you is a sunset. I usually see the 'total' highlights look fine, but the red channel is completely blown out around the sun. If the D90 will let you view the individual channels, I'd get in the habit of checking that. You can also look at the histogram to get a gauge on how much to adjust the exposure. If you have a ton of pixels on the right side (i.e. a value of 255) you'll have to dial in more -EV than if you just had a small spike there. Hope this helps! [/QUOTE]

Verification