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18% Gray Cards - What's the idea?
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<blockquote data-quote="WayneF" data-source="post: 549264" data-attributes="member: 12496"><p>No, but I'm sorry, I really don't know how to answer. I probably don't understand the question, because I don't really know which part you are asking about. But my fear is you may be trying to read too much into it. If you are able to point out any part that causes confusion, I would very much appreciate knowing which part that is, maybe it can be fixed.</p><p></p><p>The talk about clipping is really about using the camera meter to meter the subject directly, not the gray card.</p><p>For example, the talk about gray scale luminance is not about the gray card at all.</p><p></p><p>The gray card does not necessarily cause clipping. It is surely less likely to than metering direct. Because the point of metering on the gray card is to meter the actual light level in a standard situation, but specifically to be independent of the subject colors. The real point is that the gray card is to be an inexpensive substitute for an incident meter. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> But the meter is aimed at the gray card, not at the subject at all. We meter a value for the light that ought to then be good for many different subjects.</p><p></p><p>If metering directly on the subject, we might get clipping. Red colors (like roses outdoors) especially, because daylight white balance boosts the reds and reduces the blues. Blue things indoors (incandescent) could be the opposite. And light colors are an issue. The advantage of metering on the gray card is that it is independent of the subjects colors, so whites and yellows and greens don't read high, nor dark colors low.</p><p></p><p>I am happy to try again if you can point me better? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="WayneF, post: 549264, member: 12496"] No, but I'm sorry, I really don't know how to answer. I probably don't understand the question, because I don't really know which part you are asking about. But my fear is you may be trying to read too much into it. If you are able to point out any part that causes confusion, I would very much appreciate knowing which part that is, maybe it can be fixed. The talk about clipping is really about using the camera meter to meter the subject directly, not the gray card. For example, the talk about gray scale luminance is not about the gray card at all. The gray card does not necessarily cause clipping. It is surely less likely to than metering direct. Because the point of metering on the gray card is to meter the actual light level in a standard situation, but specifically to be independent of the subject colors. The real point is that the gray card is to be an inexpensive substitute for an incident meter. :) But the meter is aimed at the gray card, not at the subject at all. We meter a value for the light that ought to then be good for many different subjects. If metering directly on the subject, we might get clipping. Red colors (like roses outdoors) especially, because daylight white balance boosts the reds and reduces the blues. Blue things indoors (incandescent) could be the opposite. And light colors are an issue. The advantage of metering on the gray card is that it is independent of the subjects colors, so whites and yellows and greens don't read high, nor dark colors low. I am happy to try again if you can point me better? :) [/QUOTE]
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18% Gray Cards - What's the idea?
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