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  #1  
Old 10-23-2013, 06:19 AM
gemnor gemnor is offline Windows 7 32bit Office 2010 32bit
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Default Default image size of 220ppi

I just cant work this out!
When I insert an image into a Powerpoint slide, it is automatically reduced with less resolutions. I know the default ppi is 220 but how does that work out, for example, I have inserted a picture with 5184 x 3456 resolution


and it ended up reduced to 1114x742, and another picture was 2984 x 2238 and ended up 990 x 742. so I guess it it not just a case of dividing by 220
Thanks
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Old 11-02-2013, 12:23 PM
Zimm Zimm is offline Windows 7 64bit Office 2007
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PowerPoint 2010 does not import all of the pixels if the resolution of the image is greater than 150 ppi. It only imports enough pixels to create an image which is the size in inches times 150.
If you want to import all of the pixels and then be able to adjust the size of the image you have to first change the image resolution to something less than 150 ppi. Makes no sense, but that is the way it is.
Zimm

Last edited by Zimm; 11-02-2013 at 12:29 PM. Reason: Spelling
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Old 11-02-2013, 01:23 PM
gemnor gemnor is offline Windows 7 32bit Office 2010 32bit
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Many thanks for your reply, yes it doesn't make sense as my 'set default target output' of an image is set at 220ppi
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Old 11-02-2013, 06:57 PM
Zimm Zimm is offline Windows 7 64bit Office 2007
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gemnor, I note you mention a "Default target output". I have been searching for a free or cheap program that would permit changing the ppi resolution of an image. Are you using such a program?
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Old 11-03-2013, 02:44 AM
JohnWilson JohnWilson is online now Windows 7 64bit Office 2010 32bit
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ZIMM
How are you checking that PPT is reducing the dpi of high res images?

I ask because it doesn't!

By default when you save images ARE compressed but you can turn this off in Options > Advanced (In 2010) In 2007 you need to alter the registry
HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\P owerPoint\Options
Create a new DWord AutomaticPictureCompressionDefault and set its value to 0

If you are exporting the slides as images this is a different matter but that's not what you said.
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Old 11-03-2013, 04:58 AM
gemnor gemnor is offline Windows 7 32bit Office 2010 32bit
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I know that I cld change the resolution of an image in a program such as Photoshop but I just want to work in Powerpoint. Also I can use the 'Compress Pictures' in powerpoint, but back to my original confusion about the default compress that Powerpoint uses?
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Old 11-03-2013, 05:51 AM
JohnWilson JohnWilson is online now Windows 7 64bit Office 2010 32bit
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Start with the physical size on the slide in inches. Lets say it's 5 x 6
If you compress to 220 dpi (assuming it was more than this to start with) it will be 1100px x 1320px (ie 5 x 220 and 6 x220). The original dpi is not relevant as long as it's more than the target.

I would never use PPT to resize jpgs because as well as resizing with little flexibility it can also increase the jpg compression and reduce quality.

A good free tool is Irfanview
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Old 11-03-2013, 10:33 AM
Zimm Zimm is offline Windows 7 64bit Office 2007
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John Wilson
If you import an image 717 px x 531 px at resolution of 2800 ppi it creates an image which is .256" x .19" which cannot be stretched to fit a 10"x7.5" virtual frame for display in PowerPoint because when you export that image it now only contains 38 px x 28 px of pixel content. This did not happen in PPT 2000, 2003 or 2007 but it happens in PPt 2010. If there is some control to prevent it happening, I would very much like to know what it is?
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Old 11-03-2013, 11:00 AM
JohnWilson JohnWilson is online now Windows 7 64bit Office 2010 32bit
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When you EXPORT an image (I guess you mean right click > Save as picture) The export resolution is 150dpi. I don't think this is easily changed.

This does not mean the image has been downsampled within PPT though. If you save (make sure you do not allow compression on save) and change the extension to .zip you should be able to look in the zip file PPT\MEDIA and find your image file.
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Old 11-03-2013, 11:47 AM
Zimm Zimm is offline Windows 7 64bit Office 2007
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John,
But the image has been downsized! This arose because the image I quoted was displayed in a photography competition using PowerPoint 2010 and there are so few pixels that it was absurd to display it full screen even though the pixel dimensions or the original image were quite adequate. However, I am beginning to believe that this is perhaps an issue between Adobe and Microsoft because I tried IrfanView which permits me to change the resolution without changing the pixel size. However, both Adobe and PowerPoint 2010 continue to treat the changed file as still having the original 2800 ppi resolution. Most other cheapie systems I have tried regard resolution as something only to estimate a future print size and only IrfanView seems able to even record a change and show it again upon reload.
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Old 11-03-2013, 12:30 PM
JohnWilson JohnWilson is online now Windows 7 64bit Office 2010 32bit
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Obviously a 2800 dpi image of such a tiny size is pretty extreme but I would still be surprized if PPT resampled it.

Did you try extracting from the zip file?
Did you insert using INSERT > IMAGE or just drag it from Adobe (bad idea)?

If you email me the image I can see what happens here.

EDIT

Thanks ZIMM
I got the images and yes 2010 (and 2013) DO downsample. I have emailed you with a fix.

john ATSIGN pptalchemy.co.uk
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Last edited by JohnWilson; 11-04-2013 at 01:34 AM.
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Old 11-17-2013, 03:36 PM
Zimm Zimm is offline Windows 7 64bit Office 2007
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gemnor,
If you have not gotten a satisfactory reply to you original question, please contact me at wfzimm@sprynet.com. I think you are troubled by the same problem I have now solved.
Zimm
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  #13  
Old 11-18-2013, 02:48 AM
JohnWilson JohnWilson is online now Windows 7 64bit Office 2010 32bit
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You might also want to look at the page here. It is based on the reseach we did after Zimm kindly supplied files.
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