11-11-2017, 06:13 PM
(11-11-2017, 05:40 PM)Tenderfoot Wrote: I'm using the grid feature for the first time and I find the grid and ruler do not match up.
e.g. I create a new canvas 12cm by 12cm, then set the grid spacing to 5mm in both directions. The ruler shows the canvas to be the correct size, but the grid doesn't line up with the 5mm spacing. It prints incorrectly too. It's the same if I use inch measurements.
Is this a known problem or am I doing something wrong?
It is not understanding the way Gimp works.
Gimp works in pixels, not physical units like mm or inches. And there can only be whole pixels, not fractions of a pixel.
Take a look at the image attached below.
I am attempting to create an image 120mm x 120mm @ 100 dpi.
Gimp calculates the number of whole pixels and displays it on the screen (472x472)
It then calculates the size in mm from this (119.89mm). So you don't get exactly 120mm.
The same happens with the grid.
If you set a grid of 5mm, Gimp converts to the closest whole pixels. This is not exactly 5mm, which is why you get the mis-match.
Much better if you think in pixels and set everything in pixels. Then things work as expected.