[Digikam-users] DNG to PNG file size

[Josh Jones]

  Hello,
I am using Digikam 1.5 with Kubuntu 10.10. I shoot  and import into 
Digikam with DNG and save as PNG when using the image editor.  My 
question is why do I get such a large PNG file after performing very 
small changes (levels, etc) to the images?  For example, I started out 
with a 10.7MB DNG file, adjusted the level, saved file as PNG with level 
9 compression, and received a 45.7MB file.  Both are 16bpp, and I just 
can't figure out where all the extra comes from.  Any thoughts?
Thanks