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	<title>David Weaver Photography &#187; Lighting</title>
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	<link>http://weaver.net/blog</link>
	<description>Fine &#38; Diverse Imagery</description>
	<lastBuildDate>Wed, 01 Sep 2010 07:07:26 +0000</lastBuildDate>
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		<title>Lone Star Beer Can White Balance (Wonkish)</title>
		<link>http://weaver.net/blog/2010/01/lone-star-beer-can-white-balance-wonkish/</link>
		<comments>http://weaver.net/blog/2010/01/lone-star-beer-can-white-balance-wonkish/#comments</comments>
		<pubDate>Sat, 09 Jan 2010 03:16:34 +0000</pubDate>
		<dc:creator>David</dc:creator>
				<category><![CDATA[Advice]]></category>
		<category><![CDATA[Lighting]]></category>
		<category><![CDATA[Tips & Tricks]]></category>

		<guid isPermaLink="false">http://weaver.net/blog/?p=165</guid>
		<description><![CDATA[<p>Summary: I&#8217;ve added a new body to my street bag.  The color is different between body models.  While color-correcting images I found that the white found on a can of Lone Star Beer is a very convenient way to do a quick white-balance correction in Adobe Bridge.</p>
<p>I&#8217;ve been shooting all Nikon D3oo bodies last year.  [...]]]></description>
			<content:encoded><![CDATA[<p>Summary: I&#8217;ve added a new body to my street bag.  The color is different between body models.  While color-correcting images I found that the white found on a can of Lone Star Beer is a very convenient way to do a quick white-balance correction in Adobe Bridge.</p>
<p>I&#8217;ve been shooting all Nikon D3oo bodies last year.  A few days ago I traded up one of the bodies to a newer D300s. Now the RAW unprocessed color across the different models is different in a bad way.  I find my new D300s uncorrected RAW images to be a few points magenta and blue (purple).  This wrecking havoc on my workflow as I&#8217;m having to color balance all 70+% of my images in a way that is different from the 30% of the images I&#8217;ll shoot with an older D300 at an event.</p>
<p>If it were a few images I wouldn&#8217;t care.  However New Year&#8217;s Eve was my biggest shoot day ever only to be followed up with 10 days of Free Week Austin which will result in about 1200-1300 published images.  If I spend and extra 10 seconds on each image to color correct it then that is 3.5 hours of extra time.  You get the idea.</p>
<p>First thing was to change the color balance in the camera.  As I us AUTO white balance for most of my event work and it works well for the vast majority of pics.  I went in and made a small tweak the AUTO color balance to A1 / M1.  This pulls the automatic color balance away from the blue / magenta cast I was getting in skin tones.</p>
<p>Now I&#8217;m getting good results from the D300s that are comparable (yet not identical) to the default Auto setting on the D300 bodies.</p>
<p>Here&#8217;s the cool part&#8230;</p>
<p>As I was color balancing hundreds of photographs I found that Lone Star beer cans were a frequent common denominator &#8211; they were in lots of shots.  I started doing a simple white balance correction within Bridge using the top radiating white stripes in the can. I liked the results.  This really sped up processing time.</p>
<p>I decided to do a quick studio test on &#8216;Lone Star&#8217; white.  These test were done setting the WB to Flash if only to lock down the camera and remove minor changes that can occur between two shots in AUTO.</p>
<p>Here is an images pulled out of RAW with no post processing other than resizing the image for this post.</p>
<p style="text-align: center;"><img class="aligncenter size-full wp-image-170" title="RAW_ONLY" src="http://weaver.net/blog/wp-content/uploads/2010/01/RAW_ONLY.png" alt="RAW_ONLY" width="439" height="646" /></p>
<p>I see the whites and greys shifting a bit blue and green.  Even on an uncorrected monitor you should see the image below is warmer.</p>
<p>Now If I white balance this print using a middle grey value in Bridge I get this:</p>
<p style="text-align: center;">
<div id="attachment_173" class="wp-caption aligncenter" style="width: 449px"><img class="size-full wp-image-173 " title="RAW_WB_IN_BRIDGE" src="http://weaver.net/blog/wp-content/uploads/2010/01/RAW_WB_IN_BRIDGE.png" alt="White-balanced in Bridge using a middle grey (128) value" width="439" height="646" /><p class="wp-caption-text">White-balanced in Bridge using a middle grey (128) value</p></div>
<p>The middle grey at 115 is grey and the darker grey goes a little blue.  Note that the Green values do not change only Red and Blue change.  Now look at the values for hte &#8216;Lone Star&#8217; White.  The &#8216;balanced&#8217; images has a slight  reduction in blues and a larger bump in the reds.  This is fine as I don&#8217;t mind slightly warmer skin tones.</p>
<p>Now if I were to white balance a real world image using point #2 I would blue up the image a few points.  So I can take the uncorrected image in RAW and white balance it using &#8216;Lone Star&#8217; White to get a fairly close white balance.  Almost as if I was shooting with a grey card in the scene.</p>
<p>Keep in mind that this is MY set up for shooting a SB-900 on a D300s</p>
<p>I haven&#8217;t tested it with a PBR but in practice I get similar results doing a whilte balance off of the white on a can of PBR.</p>
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