[scribus] Reducing photo filesizes and dpi for PDFs
gregp_ky at yahoo.com
Mon Jan 9 13:23:39 UTC 2012
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:
where both external and internal compressions were done to show how file
size and image quality change.
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