Sending jpeg files over the net

I find that sometimes when I send a jpeg file to someone over the internet, the file is much larger in physical dimensions for the recipient. eg. I had a 7 cm by 5 cm file at 300 pixels per inch made in photoshop, and saved as a jpeg file. When it was received, it took up over an A4 page when printed. It only appears to happen when the recipient is on windows, but not always. I am working on a mac under OS9. Any explanations as to what is happening, and how to overcome it, please.
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KBlairConnect With a Mentor Commented:
The image is 2.75" x 1.96" @ 300 ppi
therefore it will be 825 x 588 pixels.
You don't day what application you are using on the Windows box to print it, but many Windoze apps ignore the ppi information and assume the 72 ppi default. That would produce and image of 11.45"x8.16" just over A4 as you say. You need to print the image in a good graphics app on the Windows box which allows which either recognises or allows you to set the pixel density. Photoshop and Photosoap as a cheaper alternative both in my experience observe the setting.
BobHuxAuthor Commented:
KBlair, Thank you for your answer, but I don't know what software the recipients on windows are using. I just get reported back that the image was too big, to which I suggest changing the resolution. I use photoshop 5 for macs, and then save as jpeg files. So is the problem as simple as I suspected and you suggest, and that it is arising as a consequence of software inadequacies or user inexperience at the recipent end? If so, I will accept your answer. Thanks.
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