: Gimp: resizing image in mm I scanned an 210X297 mm page and the scanner gave me a 899.58x1238.25 mm image. (not sure why). I am trying to resize the image to be 220x310 mm. The bit that

@Samaraweera207

I suspect the problem you have is because the resolution of the scanned image is not the same as the resolution setting in GIMP. When you open an image in GIMP, if you do not set the resolution exactly the same as the scan, then the size will show as different.

It's easy enough to fix. Take a note of the resolution you scanned the image at. You might need to look through your scanner settings to find out what the resolution is set at. Then in GIMP, click Image > Print Size. Enter the resolution you scanned the image at. This should fix the size problem.

Vote Up Vote Down

@Dunderdale640

The image is made of pixels (obviously always an integer number of them), and the print size is obtained by multiplying the size in pixels by the print definition in pixels-per-inch or pixels-per-millimetre. In other words there is no true physical size.

Now it all depends of the size in pixels (which is something you don't mention). You can set the print size to anything you want using Image>Print size and changing the print resolution. The image will appear pixelated if the print definition is below 100PPI. How acceptable this is depends on the image content. To give you an idea of print definition:


Last consumer-grade CRT displays: 72-80 PPI
Current LCD: 100-120PPI
High definition LCD: 200 PPI
Draft paper printing: 150 PPI
Standard office printing: 300PPI
High quality office printing: 600PPI


Note that your scanned image has not got the right aspect ratio for an A4 (1238.25/899.58 is 1.38 when it should be 1.41) so you may have to crop it a bit.

Vote Up Vote Down