Can Gimp increase the DPI of a PSD file without affecting the physical dimensions of the image? We have a wedding invitation in PSD that is 72 DPI and the printer needs 300 DPI. Thanks in advance.

2008/11/17 David Gowers :

Hi,

2008/11/17 Dotan Cohen :

Can Gimp increase the DPI of a PSD file without affecting the physical dimensions of the image? We have a wedding invitation in PSD that is 72 DPI and the printer needs 300 DPI. Thanks in advance.

You need to scale your image up to 300/72 (~416.6%) of it's current size as well as setting DPI to 300.

To understand why, you need to realize that your original question is like asking 'How can I make this small while keeping it big?' -- DPI is literally how many pixels are printed per inch. Less pixels in the source image == less physical size.

David

That is actually what I had done, David, however I figured that it was worth asking if there is a better way in Gimp. Lots of people smarter than myself have worked on Gimp, and I should imagine that my situation is not unique.

Thanks!

2008/11/18 David Gowers :

Hi,

On Tue, Nov 18, 2008 at 1:24 AM, Dotan Cohen wrote:

2008/11/17 David Gowers :
That is actually what I had done, David, however I figured that it was worth asking if there is a better way in Gimp. Lots of people smarter

Well, you could create a script which only requires you to specify target DPI, and it would then read the current DPI, calculate the scaling factor from that vs target DPI, scale the image, and finally set the DPI.

gimp-image-(set|get)-resolution, gimp-image-scale (or scale-full) would be the PDB calls you'd need for this.

Thanks. I'm only working on one image, but it is good to know for the future if I run into this again.