[magick-users] Trouble converting 300dpi jpeg to 72dpi jpeg with same size

[Nicolas Dhomont]

Hello


I'm trying to convert 300dpi CYMK jpeg to 72dpi RGB jpeg

I already manage to convert from CYMK to RGB by doing the following :

convert fromFile -antialias -colorspace RGB toFile

I'm now trying to convert from 300 dpi to 72dpi with the following :

convert -units PixelsPerInch fromFile -colorspace RGB -antialias 
-resample 72x72 toFile

Size of toFile is reduced by a 4,16 ratio (= 300 / 72) but still in 300 
dpi. (It means that if fromFile is 2.66inch wide, toFile is 2.08inch 
wide for exemple). But I want exactly the opposite : a file in 72 dpi 
with same size.
I've also played with the -density option unsuccessfully.

As converting is quite simple with photoshop, I guess convert can do 
same but I can't find out how.



Any help would be highly appreciated

Nicolas