On Monday 29 June 2009 09:13:16 pm Anthony Thyssen wrote: > On Mon, 29 Jun 2009 16:37:28 -0400 > > John Culleton <[email protected]> wrote: > | On Monday 29 June 2009 12:00:30 am Anthony Thyssen wrote: > | > On Sun, 28 Jun 2009 17:35:57 +0200 > | > > | > Noel da Costa <[email protected]> wrote: > | > | Hi, > | > | > | > | Thanks... what I did was open it into Photoshop, which > | > | reports the resolution as 300dpi. > | > | Perhaps Gimp would do the same? > | > > | > BOTH would be faking it!!! > | > Just as IM does. > | > > | > > | > All of them are raster image processors. > | > | Therefore in Gimp one can increase or decrease the dpi figure > | and run the dimensions up or down as you go. The converse is > | not true for some reason. > > What do you mean the converse is not true. Of course it is true. > In IMageMagick perhaps. In Gimp no. The resolution remains constant if you adjust the dimensions, meaning that it is doing some downsampling or other conversion under the covers. It is just a Gimp peculiarity. The basic rule, that size is inversely proportional to density holds. But to adjust size without converting the raster image I have to adjust the density. For example I can scan a photo at 600dpi, and then decrease the dpi to get a bigger image at 300 dpi. > convert -density 300 file.ps info: > convert -density 600 file.ps info: > > would report that the 600 dpi image is twice the size (four times > the area) as the 300 dpi version! > > > Anthony Thyssen ( System Programmer ) > <[email protected]> > ----------------------------------------------------------------- >------------ UNIX is the spawn of the devil, > why he even has his deamons running the thing! -- > Anthony Thyssen > ----------------------------------------------------------------- >------------ Anthony's Home is his Castle > http://www.cit.gu.edu.au/~anthony/ > _______________________________________________ > Magick-users mailing list > [email protected] > http://studio.imagemagick.org/mailman/listinfo/magick-users
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