Changeable DPI in the user preferences setting

I agree that it would be very handy and useful that FF can be configured the DPI settings for the standalone version

Also would be good that FF should Keep the same DPI as it already has when imported the image, because the result of any rendered result is always at 72 DPI independently of what DPI the source did have before

Here are already some threads about this topic

Search in FF forum for 72 dpi conversion of rendered result


Alternatively now is possible and available two ways to solve this

1 - Use FF as a plugin, as it will not change the DPI or the colorspace, so it will keep the source data

Here is more information difference of FF standalone and as a plugin

2 - The other workaround is that you can change the DPI later in Adobe Photoshop without changing the image resolution and quality, or maybe using another graphic software that can do the same thing

Starting with version 8 Filter Forge retains the original DPI metadata.