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When I start a new project of a poster which is to be printed on an A4 paper, I select gimp's A4 dimension template, but as I recently found out, it is actually NOT A4. If I import the finished product into MS Word which uses standard A4 sizes, my picture turns out to be longer than expectd.

Why is it so? Is it a problem in Gimp or are there different A4 dimensions for text and different for pictures?

  • you mean to copy and paste from Gimp to Word? – Rosenthal Sep 13 '14 at 17:27
  • no. what i mean is that an a4 document created in word has width 'A' pixels and height 'B' pixels. whereas gimp's A4 sheet has width 'P' pixels and height 'Q' pixels. So the 2 things, although being A4, do not match up in sizes. Why so? – zhirzh Sep 13 '14 at 17:46
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    What's the resolution (ppi) setting for your Gimp file? Word assumes everything is 72 or 96ppi. A higher PPI in gimp will result in a larger file in Word. – Scott Sep 13 '14 at 18:42
  • true that. but isn't it true that increasing or decreasing the ppi will still preserve the ratio? Because as it turns out, even the ratios don't match. – zhirzh Sep 13 '14 at 18:50
  • I always have to resize the images when I import them to Word, and I don't know why. Good question. – Rosenthal Sep 13 '14 at 18:50
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Probably it would be more usefull if you specified the dimensions of your document isntead of naming it "P" and "Q".

1) I'm posting the dimensions here. The A4 paper is 21.0 x 29.7 cm.

2) The gimp's A4 templete generates a file of 300 ppi.

3) 300ppi converted to ppcm are: 300/2.54 which does not give us an exact number. 118.11 ppcm.

4) 118.11 ppcm x 21 cm= 2480 px 118.11 ppcm x 29.7 cm = 3508 px

5) The generated image from the templete A4 in gimp is 2480 x 3508 px. Yes it is correct.

Any strange behavior on word importing files is that. A strange behavior on word when you import files.

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    I´m adding this as a coment. We don't know what was the process to import the file into word, or the settings on the image configuration, file format, etc. That is why I'm calling that "strange behavior". – Rafael Mar 16 '15 at 3:40
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GIMP correctly informs the user on the image size based on the number of pixels and resolution metadata - as can be set on image->print size... menu option. It may be that some of the less used image formats have a buggy export of the resolution information, but that is certainly not the case for PNG or JPG.

As put in the comments above it is MS Word which is at fault, assuming fixed Pixel Per Inch information, regardless of the resolution recorded in the image headers.

As a work-around, got to the Image -> Scale image... dialog, and fixing your image size in inches or millimeters, change the resolution for one of those hardcoded by MS Word - which, as the comment from @Scott should be 72 or 96 ppi. (Of course your image will have less pixels, and therefore less detail).

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