How to save your images up to 300 dpi

I know that some journals are very particular about the resolution of the images that you've submitted to them. They just won't accept powerpoint slides as images. Hence, in order to fulfill their requirement of 300 dpi images, you can do the following stuff - however, do note that this is not for the faint hearted... something might go wrong and you'll regret that you've ever tried this. 

However, I can confidently say that I've tried this method for PowerPoint 2010 and it works perfectly!

So, you've constructed your diagrams on powerpoint and wanted to export them as 300 dpi images (regardless of the format of the images)... how? Check the following steps out:

Step 1: Change the export resolution setting

1. Exit all Windows-based programs.
2. Click Start, and then click Run.
3. In the Open box, type regedit, and then click OK.
4. Locate one of the following registry subkeys, depending on the version of PowerPoint that you're

using:

PowerPoint 2013

HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\PowerPoint\Options

PowerPoint 2010

HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\PowerPoint\Options

PowerPoint 2007

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\PowerPoint\Options

5. Click the Options subkey, point to New on the Edit menu, and then click DWORD Value.
6. Type ExportBitmapResolution, and then press Enter.
7. Make sure that ExportBitmapResolution is selected, and then click Modify on the Edit menu.
8. In the Edit DWORD Value dialog box, click Decimal.
9. In the Value data box, type the value of the resolution that you want such as 300. (The maximum limit for PowerPoint is 307 dpi though)
10. Click OK.
11. On the File menu, click Exit to exit Registry Editor.
(Source: http://support.microsoft.com/kb/827745/en-us)

You should be able to export images in whatever format you like at 300 dpi.

For guide on how to export PowerPoint slides as images, refer to here: http://support.microsoft.com/kb/827745/en-us