Adjusting the DPI of image export.

illuminatispy

How do I adjust the DPI of the BMP/JPG/PNG export options? I have everything set to max but I'm only getting 96 DPI exported and I need at least 300 DPI.

Joachim de Ravenbel

As far as I know, you need to do some math here:

1. Determine the size of the map you want to print, in inches
For example, 10×7.5
2. Multiply the width and the height by the target resolution, 300dpi in your case.
That makes 10×300 = 3000 and 7.5×300 = 2250 for the example
3. When you choose a BMP/JPG/PNG export, click on the export button an specify the calculated values for the width and the height
width = 3000, height = 2250

The exported picture still has a low imbedded dpi rate (for me it's usually 72). It's only to refer to what printers call real size.
You can force this value to someting else.
4. In GIMP use image->print size and set both xresolution and yresolution to 300 pixels/in (dpi).
In Photofiltre use image->imagesize and set the resolution to 300 pixels/inch.
In Photoshop ??? probably something like GIMP

Alternatively to step 4 and depending on your printer you should be able to specify the print resolution or size when printing.

Please note that changing the imbedded value of a picture resolution in dpi should not alter the picture in any way. It's only how computers transmit the physical real size of the picture to a printer.
And for our metric using friends, you should be able to follow all the steps with centimeters, using the resolution in pixels/cm instead of pixels/in.

I just hope I'm clear enough...

JimP

Clear enough, I think a link to your post should be made in the forum resources thread.