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Image DPI confusion - what is best advice for high res screen users?
Hi
I have been doing web design for 10 years, but I have only just discovered that images can have an actual DPI burnt into them. Is this true?
Until now I had simply worked in pixels and assumed that DPI (dots per inch) x inches was simply a rather clumsy way of calculating actual pixels. But today I have had serious trouble importing a particular image into msOutlook and it turns out that there is a DPI setting AS WELL as an actual number of pixels. And that on the image in question I had somehow managed to set it to a high value (300DPI) and every time I imported it into Outlook by any means you like, bl***y Outlook remove about half the pixels.
When I "Save For Web" from Photoshop there is no DPI settting offered, so I am assuming the web browsers ignore any DPI setting and simply take the image size from the height and width settings in the HTML. And if that is missing the browser will presumably just set (assuming the screen is running at native size, and assuming the browser is at 100% zoom) it at 1 pixel of source image to 1 pixel on screen.
However for those of us running windows on high resolution screens when need to increase the DPI setting away from 100% (technically I understand that this is called "96 DPI" although how many actual inches presumably depends on the physical size of your monitor!).
e.g. On my computer the screen is 1920x1200 on a 24inch screen and the text in windows keeps being rather too small to read. So I have changed the screen DPI in windows (using: Right-click on Desktop ==> Personalise ==> Display ==> Medium) from "Smaller 100% (default)" to become "Medium - 125%". I think my setting is in fact called "120DPI".
So now I am assuming that all images should be set to 96DPI which appears to be standard. BUT if my setup is running at 125% DPI it now appears that images from applications like FSCapture are creating images at 120DPI unless I change the default setting. But if I change it to 96DPI then BL***DY outlook increases the size of the image when I import it (on my computer which is at 120DPI remember).
What is the conclusion ?
Given that I *must* run my computer at 125% DPI (in order to read text)
- which are my best options for DPI setting?
Should I set everything to 120DPI? Or will that have weird effects when I come to display on other people's computers? Or what??
J