🚀 go-pugleaf

Adrian,

1. In general, changing the dpi does NOT change the pixels inside the graphic; however, sophisticated programs (Photoshop) CAN also change the pixels when changing the dpi (this is called resampling). So, you have to be a little careful when changing the dpi to make sure you are not also resampling. A good check is the file size; changing the dpi without resampling should not change the file size.

2. As a simple test, I created a jpeg at a weird dpi (162), which corresponded to a physical width of 2 inches. I also saved the jpeg in the gif format. When I imported both images into Frame, the dialog box opened with the correct custom dpi of 162. In both cases, when I opened the properties dialog box, each image had a width of 2 inches.

When I imported both images into a blank Word document, the jpeg was displayed correctly at 2 inches wide; the gif was displayed at a slightly larger size, which corresponded to 96 dpi. Thus, in the case of gif files, Word ignores their dpi settings (I think this is due to the fact that the original gif specification did not allow a dpi setting; Word just sticks to that old specification).

3. I opened both in IE and each displayed at the same size; HOWEVER, I would not rely upon a Web browser, such as IE, as an arbiter of anything about image sizes. Use an image editor instead.

So, the main point of all of the above is that there is no guarantee that every application will display each image at its correct physical size based upon its dpi setting (see the Word example above). So long as the application you are using is getting it right, then there is nothing to worry about.

Again, if not clear, let me know,
Van