05-12-2018, 09:11 AM
This is all about printing and print resolutions.
Two images both 300 x 300 pix no.1 @ 300 ppi and no.2 @ 150 ppi. with dot-for-dot off (default setting) both obviously show the same size (zoom being equal)
With dot-for-dot off their printed size will display
no.1 = 1 inch (300 pix/300 ppi)
no.2 = 2 inch (300 pix/150 ppi)
comparison see: https://i.imgur.com/gnvMsVp.jpg
If your monitor is correctly set up, then you can measure these values on the screen.
This is my laptop, has a HD display, and a pixel resolution of about 157 ppi
Edit -> Preferences -> Display see: https://i.imgur.com/mX1bmIZ.jpg
There is a calibration page to assist, not very good in Gimp 2.8. Automatic does not always work, a know problem that has been fixed in Gimp 2.10. Try it but you might have to do a bit of measuring on the screen and arithmetic to get the correct screen pixel density.
calibration looks like: https://i.imgur.com/JaZvGC5.jpg
Two images both 300 x 300 pix no.1 @ 300 ppi and no.2 @ 150 ppi. with dot-for-dot off (default setting) both obviously show the same size (zoom being equal)
With dot-for-dot off their printed size will display
no.1 = 1 inch (300 pix/300 ppi)
no.2 = 2 inch (300 pix/150 ppi)
comparison see: https://i.imgur.com/gnvMsVp.jpg
If your monitor is correctly set up, then you can measure these values on the screen.
This is my laptop, has a HD display, and a pixel resolution of about 157 ppi
Edit -> Preferences -> Display see: https://i.imgur.com/mX1bmIZ.jpg
There is a calibration page to assist, not very good in Gimp 2.8. Automatic does not always work, a know problem that has been fixed in Gimp 2.10. Try it but you might have to do a bit of measuring on the screen and arithmetic to get the correct screen pixel density.
calibration looks like: https://i.imgur.com/JaZvGC5.jpg