PDF compression / resolution

I use the version 1.1.0 and I have a problem with the pdf options of compression / resolution. Changes of resolution have not the expected result.

For example: I have scanned an A4 page with 300dpi and saved the image as Tiff file (25MB, 2481x3508 pixel). I created some pdf files from the Tiff file with different resolution options. I have activated the compression with JPEG-average quality and have activated resample too. After this I have tried with different resolutions. I have changed the resolution under common and compression and get following results:


300dpi: 1000kB

250dpi: 1000kB

200dpi: 1000kB

150dpi: 366kB
 

Why ist the file size of 200dpi, 250dpi and 300dpi the same? Is this a bug?

If I create JPGs with PDFcreator and different resoluions (200, 250, 300dpi) the file size is different.

 

options of compression / resolution ?