I'd look at 16:9 but it can be immaterial as one can define crop an image in pdr. What is the source and purpose as that would definitely be a deciding factor?
Dafydd

I need to clarify my query....

I have a project with AR of 4:3 as my cameras picture size settings are closer to this 4:3 AR

Once downloaded from camera they are 180 dpi I have other images from a friends camera that show 72dpi.



On some images I use editing software to crop/cut/paste etc. and I can change the dpi and physiacl size.

What I wanted to know is for a 4:3 AR what is the ideal dpi and the physical size of the image,

Also the ideal for 16:9 AR

Quote: Once downloaded from camera they are 180 dpi I have other images from a friends camera that show 72dpi.



On some images I use editing software to crop/cut/paste etc. and I can change the dpi and physiacl size.

What I wanted to know is for a 4:3 AR what is the ideal dpi and the physical size of the image,

Also the ideal for 16:9 AR

You are getting confused. You are not sending out your photos to be printed on paper or producing them for the web. The resolution of the photo or image in pixels is what matters in video editing. See this article: http://www.rideau-info.com/photos/mythdpi.html .