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<blockquote data-quote="WayneF" data-source="post: 429322" data-attributes="member: 12496"><p>Clicking around on different spots of same card will show slightly different colors. This has a lot to do with the choice of how many pixels the eyedropper picks. But that is very small difference, not a problem.</p><p></p><p>Speaking of 18%, a gray card is much better than nothing, almost decent maybe, but gray cards are designed to be 18% reflectance, and nothing is said about being a neutral gray. They are not controlled for color, and NOT purely neutral. And they are really too dark to be optimum to see a color cast (even black can work, but not very well).</p><p></p><p>There are white balance cards that are gray, but a much lighter shade of gray than 18%, supposedly using controlled ink, and the resulting cards are individually tested for neutral. This costs more, and involves a tolerance.</p><p></p><p>The white cards are just plastic without pigment, dirt cheap, washable, and an excellent neutral white. I also have the WhiBal cards, but I prefer the Porta Brace cards.</p><p></p><p>Even envelopes or cheap copy paper works pretty well. White porcellian china plates work well.</p><p>But a $5 Porta Brace white balance card is very easy to carry and works great.</p></blockquote><p></p>
[QUOTE="WayneF, post: 429322, member: 12496"] Clicking around on different spots of same card will show slightly different colors. This has a lot to do with the choice of how many pixels the eyedropper picks. But that is very small difference, not a problem. Speaking of 18%, a gray card is much better than nothing, almost decent maybe, but gray cards are designed to be 18% reflectance, and nothing is said about being a neutral gray. They are not controlled for color, and NOT purely neutral. And they are really too dark to be optimum to see a color cast (even black can work, but not very well). There are white balance cards that are gray, but a much lighter shade of gray than 18%, supposedly using controlled ink, and the resulting cards are individually tested for neutral. This costs more, and involves a tolerance. The white cards are just plastic without pigment, dirt cheap, washable, and an excellent neutral white. I also have the WhiBal cards, but I prefer the Porta Brace cards. Even envelopes or cheap copy paper works pretty well. White porcellian china plates work well. But a $5 Porta Brace white balance card is very easy to carry and works great. [/QUOTE]
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