How to Make an Image 300 dpi
Dpi stands for dots per inch and refers to printed images. The term pixels per inch, or ppi, is used for images displayed on a screen. Crossroads needs images to be 300 dpi when printed, otherwise they won't look good in our print edition of the magazine.
When manipulating your images, keep in mind these points:
- An image should be either 3.5 inches wide (for a single column) or 7.25 inches wide (for two columns).
- Captions should NOT be part of an image.
Using The GIMP
You can use The GIMP, a free image manipulation program, to change the print resolution of an image. To do so, open your image in The GIMP, go to the Image menu, and select "Print Size...". In the dialog that opens, change the "X resolution" and the "Y resolution" to 300 pixels/in. Note that this will also change the width and height of the image. If the width and height are too small now, you'll have to re-generate the image with more pixels.
Using Ghostscript
You can use Ghostscript to convert a ps or pdf file to a 300 dpi jpeg. Use the following command:
gs -dBATCH -dNOPAUSE -sDEVICE=jpeg
-sOutputFile=myfile.jpg -r300 myfile.ps