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pict2png 1.0.3

Company: Brian Wells
Date Added: December 01, 2013  |  Visits: 269

pict2png

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When given a specified folder, it will find all the PICT images contained within it and convert them to PNG images.<br /><br />Images with a premultiplied alpha channels are detected and the pixel data adjusted to result in straight alpha channels as required by the PNG image format. Here are the basic steps by which this takes place:<br /> 1.Find the most prevalent background color (pixels that are completely transparent).<br /> 2.Check to see if the partially transparent pixels have color values that would indicate that they have been premultiplied with the alpha channel.<br /> 3.If the image appears to have a premultiplied alpha channel, then correct this by applying the formula: Fg = (Comp - ((1 - A) * Bg)) / A<br /><br />The formula used to undo the premultiplied alpha channel is the reverse of the standard image composition formula: Comp = (Fg * A) + ((1 - A) * Bg)<br /><br />An iMac (Early 2009) that I tested pict2png on was able to convert 1000 PICT images in just under a minute. Apple???*a*?s new Grand Central Dispatch technology is used to speed up the conversion process, so pict2png requires Mac OS X v10.6 Snow Leopard.<br /><br />If you wish to give it a try, you may download pict2png from the following location.

Requirements: No special requirements
Platforms: Mac, Mac OSX
Keyword: Alpha Channel Channels Color Composition Convert Correct Early Formula Image Images Mac Minute Pict Png Pict Png Mac Pixels Premultiplied Standard Tested Transparent
Users rating: 0/10

License: Shareware Size: 30.72 KB
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