During the Middle Ages, it was believed that attaching the topaz to the left arm protected the owner from any curse and warded off the evil eye. The ancient Romans believed that topaz provided protection from danger while traveling. Īn English superstition also held that topaz cured lunacy. However, because these translations as topaz all derive from the Septuagint translation topazi, which referred to a yellow stone that was not topaz, but probably chrysolite ( chrysoberyl or peridot), topaz is likely not meant here. Many English translations of the Bible, including the King James Version, mention topaz. In the Middle Ages, the name topaz was used to refer to any yellow gemstone, but in modern times it denotes only the silicate described above. Nicols, the author of one of the first systematic treatises on minerals and gemstones, dedicated two chapters to the topic in 1652. Alternatively, the word topaz may be related to the Sanskrit word तपस् "tapas", meaning "heat" or "fire". Pliny said that Topazos is a legendary island in the Red Sea and the mineral "topaz" was first mined there. Ancient Sri Lanka ( Tamraparni) exported native oriental topazes to Greece and ancient Egypt, which led to the etymologically related names of the island by Alexander Polyhistor ( Topazius) and the early Egyptians ( Topapwene) – "land of the Topaz". The name topaz was first applied to the mineral now known by that name in 1737. John's Island in the Red Sea which was difficult to find and from which a yellow stone (now believed to be chrysolite: yellowish olivine) was mined in ancient times. The name "topaz" is usually believed to be derived (via Old French: Topace and Latin: Topazus) from the Greek Τοπάζιος (Topázios) or Τοπάζιον (Topázion), from Τοπαζος. It is one of the hardest naturally occurring minerals and has a relatively low index of refraction. The rarest are natural pinks, reds, and delicate golden oranges, sometimes with pink hues. Topaz is often treated with heat or radiation to make it a deep blue, reddish-orange, pale green, pink, or purple.Īlthough it is often associated with golden yellow and blue, it comes in a variety of colors, including colorless. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow orange. It is used as a gemstone in jewelry and other adornments. Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al 2 Si O 4( F, OH) 2. Weak in thick sections X = yellow Y = yellow, violet, reddish Z = violet, bluish, yellow, pink Topaz Labs Sharpen AI is available as a free trial so you can try it before you buy.Colorless (if there are no impurities), white, blue, brown, orange, gray, yellow, yellowish brown, green, pink, reddish pink or even red For more advanced photographers who know Photoshop inside out, the $79.99 / £58 cost of the software may not be worthwhile. Results are, however, comparable to those achievable manually in Photoshop using the Unsharp Mask and the Shake Reduction filters, so the software may be more appealing to beginners and photographers who require a fast yet good quality sharpening fix during editing. Sharpen AI undoubtedly makes sharpening images and resolving blur such as camera shake incredibly quick and easy thanks to easy-to-use controls and artificial intelligence. With these types of blur, there’s always a finite amount of correction that can be applied and you can often see when motion blur has been corrected this is most obvious on-screen, while print is much more forgiving if the sharpening effect isn’t too strong. When resolving motion blur and camera shake, the software produces results that are once again comparable to those possible Photoshop, but the whole process is much quicker and easier. One point worth making here though is that Sharpen AI doesn’t create the high contrast edges and the halos that images can easily suffer from along subject edges using Unsharp Mask. Sharpen AI makes this incredibly easy, and where you might spend a few minutes experimenting with Unsharp Mask settings in Photoshop, Sharpen AI allows you to achieve similar results in just a few moments. One of the problems with any kind of image sharpening is that there’s a fine line between perfectly sharpened and oversharpened, so you have to take care to maintain a natural-looking result.
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