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<p>[QUOTE=&quot;calcol, post: 3879439, member: 77639&quot;]Good illustration (sorry! <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie56" alt=":inpain:" unselectable="on" unselectable="on" />) of how the same coin can look very different with different photographic techniques.</p><p><br /></p><p>There are several very low mintage coins for which I&#039;ve been trying to determine how many unique coins exist.&nbsp; Mostly I use photographs from paper and online auction catalogs, but also photos from museums, books, dealer lists ... anything I can find.&nbsp;&nbsp; It&#039;s common to encounter pairs of photos that, at first glance, I would swear are of different coins.&nbsp; But with study, eventually decide they&#039;re identical.</p><p><br /></p><p>Different lighting can drastically alter the coloration of the coin. One trick in comparing photos is to eliminate varying colors by creating digital halftones or grayscales.&nbsp; Then compare them side by side.&nbsp; Another is to colorize the halftones or grayscales different colors (one green, one red, for example), make one semitransparent, and overlay it on the other.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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