Saving an image to a higher resolution from a lower one

I have photoshop cs6 on my MacBook Pro and downloaded images I'm working on for a friend who needs them for professional use. They're all in 72 dpi so I managed to save them at a higher resolution of 300 dpi, and in Tiff format but when I try to email them the images revert back to 72 dpi. How can I keep the resolution at 300 or higher for email
Thanks

I know you haven't asked for advice about the actual re-sampling process, but I can't help myself .
If the images are for print reproduction or a similar high quality requirement the results are likely to be very poor even if up-sampled to 300dpi. It's OK to down-sample images if the pixel data is there in the first place. If it's only 72dpi and then up-sampled, and even if it looks good on screen, it'll be rubbish in commercial print.
The exception might be if the actual dimensions of the 72dpi image is large and it is up-sampled to 300dpi but at the same time the dimensions are reduced considerably that should help preserve some quality.
All that said, if you are using Mail, try selecting Actual Size, as shown in the image (if you haven't already). The option only appears when you add an attachment to an email.

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Is this difference in resolution due to both PhotoShop and Fireworks being different products and originally from different companys, or due to me working on a PC and our Flash designer working on a Mac.
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Hi,
I've just found out that the Flash designer is using Virtual Desktop on their mac, and doing their development in the virtual pc enviroment. Not sure if the Mac way of interpreting image resolutions is 'passed' to the virtual PC? My Fireworks is set up as 72 pixels/inches as the resolution so I think the mac/pc differences is still the cause of the problems.
Thanks
Stephen

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Yes with caveats.
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I discover I am suddenly having a similar problem as well.
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I cant save high resolution image from google safari 5.0.4

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Update your system software to v10.6.7 and Safari 5.0.5
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Joseph,
In an NLE, you are really only using the pixel x pixel dimensions. DPI/PPI mean nothing, except a larger file size.
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PSD will be as clear a format, as you can get. I'd not bother with any JPG compression, as by the time that you lower the compression settings, i.e. compress less, to keep the quality, you will not have compressed all that much.
For zooming in, you do not need for the image to be much larger than the preset for your Project. The FAQ's at the top of the page have some good recs. for the exact sizing. If you will be panning, while zoomed out, you'll want just enough extra to allow for that movement.
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Hunt

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http://minecraft.1favre.de/output.png
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Konqueror memory usage: http://wklej.org/id/1027305/
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Linux linux 3.8.10-1-ARCH #1 SMP PREEMPT Sat Apr 27 12:36:59 CEST 2013 x86_64 GNU/Linux
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X.Org X Server 1.14.1
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X Protocol Version 11, Revision 0
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Hello,
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!
Thank you.

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ghotiz wrote:
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Saving an image to a higher resolution from a lower one

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