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<blockquote data-quote="Geoffc" data-source="post: 94674" data-attributes="member: 8705">MarcelChanging DPI does not change image size in MB it just tells a printer how wide to print it, should you be printing. Try exporting from Lightroom and change dpi from 1 - 72 - 1000. I suspect the 3 files will all be the same size. Ive tried it to prove it to myself. All it changes is the metadata tag. If you change the image size (dimensions of w and h) in photoshop it will probably report a different DPI but that's different. At the end of the day the MB size is just pixels wide by pixels high. Unless you chuck some away using compression or reducing W and H they will not shrink. I keep meaning to post on this subject as it's often confusing.Best way to achieve smaller size is export from Lightroom and specify max size in bytes. I'm amazed at the quality LR can make a 256k file. Better than anything I've ever tried before.I've just found an <a href="http://www.rideau-info.com/photos/mythdpi.html" target="_blank">article</a> that explains it better than I didMarcel, if we are at crossed purposes I apologise for the points above.</blockquote>

[QUOTE="Geoffc, post: 94674, member: 8705"] Marcel Changing DPI does not change image size in MB it just tells a printer how wide to print it, should you be printing. Try exporting from Lightroom and change dpi from 1 - 72 - 1000. I suspect the 3 files will all be the same size. Ive tried it to prove it to myself. All it changes is the metadata tag. If you change the image size (dimensions of w and h) in photoshop it will probably report a different DPI but that's different. At the end of the day the MB size is just pixels wide by pixels high. Unless you chuck some away using compression or reducing W and H they will not shrink. I keep meaning to post on this subject as it's often confusing. Best way to achieve smaller size is export from Lightroom and specify max size in bytes. I'm amazed at the quality LR can make a 256k file. Better than anything I've ever tried before. I've just found an [URL="http://www.rideau-info.com/photos/mythdpi.html"]article[/URL] that explains it better than I did Marcel, if we are at crossed purposes I apologise for the points above. [/QUOTE]

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