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Apple Computing Products:
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File size Doubling when "duplicating" or "exporting" in Lions Preview app. WHY?
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<blockquote data-quote="Lifeisabeach" data-source="post: 1273607" data-attributes="member: 38864"><p>Ok. I had the same thing happen. When you first open the document, it is ready to be edited and Preview is rendering it with its own technology, filters, what have you (sorry… I'm not technically knowledgeable enough about this to explain better). When you are saving it, even though you made no changes, Preview is "processing" the file into a new one using its own rendering engine. It isn't technically the same as copying it. This happens too in Adobe Reader (which is not yet compatible with the new Lion features), though in the test I just ran, it didn't bloat the file as much as Preview does.</p><p></p><p>MS Word documents are know to bloat up and up in size because the document retains a history of every change made to it for the "undo" function. One tip I had read years ago said to take one of these giant documents, copy everything, paste it into a new one and save it, and you'd have a much smaller file size for what otherwise is the same document. It's all that accumulated junk that you don't "see" that was bloating the file size.</p><p></p><p>As for Export and Duplicate… same thing. When you export it, you are having Preview process and re-save the file. Duplicate just re-opens the file in a new instance, but you still are processing it when you save the duplicate. The only way to get a proper copy of a file is to copy/paste in Finder.</p></blockquote><p></p>
[QUOTE="Lifeisabeach, post: 1273607, member: 38864"] Ok. I had the same thing happen. When you first open the document, it is ready to be edited and Preview is rendering it with its own technology, filters, what have you (sorry… I'm not technically knowledgeable enough about this to explain better). When you are saving it, even though you made no changes, Preview is "processing" the file into a new one using its own rendering engine. It isn't technically the same as copying it. This happens too in Adobe Reader (which is not yet compatible with the new Lion features), though in the test I just ran, it didn't bloat the file as much as Preview does. MS Word documents are know to bloat up and up in size because the document retains a history of every change made to it for the "undo" function. One tip I had read years ago said to take one of these giant documents, copy everything, paste it into a new one and save it, and you'd have a much smaller file size for what otherwise is the same document. It's all that accumulated junk that you don't "see" that was bloating the file size. As for Export and Duplicate… same thing. When you export it, you are having Preview process and re-save the file. Duplicate just re-opens the file in a new instance, but you still are processing it when you save the duplicate. The only way to get a proper copy of a file is to copy/paste in Finder. [/QUOTE]
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File size Doubling when "duplicating" or "exporting" in Lions Preview app. WHY?
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