Ok, you plan to use that size image , 640 x 324 pixels.
You want to print that in 4 horizontal pieces using 6 x 4 paper. Not much calculation required.
First use Image -> Print Size to change the units to inches (1) , the width to 24" (2) , and that gives a pixel-per-inch (ppi) value of 26.667
Now for some calculation,
6" @ 26.667 = 160.002 so the vertical guides go at positions 160 , 320 , 460
4" @ 26.667 = 106.66 Gimp works in whole pixels so there is some rounding, horizontal = 107 , 213 , 320
Note the proportions of the image are not quite 6:4 There is a 4 pixel strip to discard.
Split those along the guides using Image -> Slice Using the guides to give individual image files. They are small because the original is small. There is a guide to printing resolutions here: http://resources.printhandbook.com/pages...inting.php Probably, the original image should be about 4 times larger, about 2560 pix wide.
You want to print that in 4 horizontal pieces using 6 x 4 paper. Not much calculation required.
First use Image -> Print Size to change the units to inches (1) , the width to 24" (2) , and that gives a pixel-per-inch (ppi) value of 26.667
Now for some calculation,
6" @ 26.667 = 160.002 so the vertical guides go at positions 160 , 320 , 460
4" @ 26.667 = 106.66 Gimp works in whole pixels so there is some rounding, horizontal = 107 , 213 , 320
Note the proportions of the image are not quite 6:4 There is a 4 pixel strip to discard.
Split those along the guides using Image -> Slice Using the guides to give individual image files. They are small because the original is small. There is a guide to printing resolutions here: http://resources.printhandbook.com/pages...inting.php Probably, the original image should be about 4 times larger, about 2560 pix wide.