I am running a fully updated Microsoft Powerpoint 2016 running on Windows 7 SP1.
I have an annoying problem when I insert images into a slide. Whether it's a PNG or JPG file, after I insert them into a slide they get automatically shrunk down to a tiny thumbnail (e.g. 100 pixels wide at 100% "zoom"), and when I try to resize them to make them bigger they look extremely pixellated.
I double checked the resolution of those images and they are big (e.g. 1920x1080) and open correctly in other programs. The strange thing is that this only happens to some PNGs/JPGs and not others... I have no idea why this is.
I have tried clicking on the Insert Image button in the ribbon, dragging the picture into the slide from Explorer, or copying it over from Windows Image Viewer to no avail....
Can anyone help me troubleshoot this? Thank you.
Answer
Thanks for posting the sample images; that helped explain this.
A little background: Some image file types don't include suggested Size/DPI values, others do. When PowerPoint imports one of the former, it has to decide how large to make the picture, so it defaults to 96dpi (usually), divides the width of the image (in pixels) by 96 to arrive at the width (in inches) on screen. Or by 37.79-ish to get the width in cm if your system is set to metric.
If the image DOES contain size/dpi info, PPT tries to respect the suggested size, and that's what's going on with your two images.
The Anne Frank image is 919 pixels wide but for some inexplicable reason, is set to 1943 dpi. Somebody set dpi to match a date by mistake?
919/1943 = .47 and that's the size the image comes in at when you insert it into PPT.
The Creative Commons image is set to 1080dpi, so the same math applies. 1440 pixels/1080 = 1.333 inches, and that's the size it appears in PPT.
Saving from Irfanview must have removed the suggested size/dpi data or set it to something more reasonable. If you use IrfanView's batch processing, Advanced Options, you can choose the dpi you want.
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