On 01/09/2012 07:09 AM, Peter Nermander wrote: >> That's strange because IF all photos are automagically reduced to the >> 300 dpi set in the export dialog, they will make much less image surface >> (and thus dots) than that single large map. There is also some text on >> the page and gaps between the photos. > > If your images are JPEG the "file size" does not only depend on the > number of pixels, but also the degree of compression. > > That is the reason that a JPEG with lower resolution might give a > larger file size. > > In the same place where you set the maximum resolution you can also > set the compression level. > > On of the hard things with JPEG is that you will usually have to test > so see how much compression you can use without destroying the image. > You can't say that one compression always looks ok and onother not, > because it depends on the image content. >
You might look at this wiki page for some guidance: http://wiki.scribus.net/canvas/Image_DPI_and_Scaling,_and_Resultant_File_Sizes where both external and internal compressions were done to show how file size and image quality change. Greg
