01-17-2021, 08:43 AM
That is it. The units displayed is only an internal Gimp calculation pixels-to-inches / pixels-to-millimetre and so on. The image in Gimp is W pix x H pixels. All to do with when an image gets sent to a printer
A 400 x 800 pix image with a ppi of 100 prints 4" x 8"
Scale that x3 to 1200 x 2400 pix and it still has a ppi of 100 and will print (@100 ppi) 12" x 24"
The place to change the ppi setting is Image -> Print Size which keeps the image size in pixels and changes the image information sent to the printer.
That scaled up 1200 x 2400 pix image with a 200 ppi setting prints 6" x 12"
Of course, once the image is out of Gimp as a jpg / png / etc for printing, print size (from ppi) can be changed by the printer software but the basic pixel information remains which has a bearing on print quality.
A 400 x 800 pix image with a ppi of 100 prints 4" x 8"
Scale that x3 to 1200 x 2400 pix and it still has a ppi of 100 and will print (@100 ppi) 12" x 24"
The place to change the ppi setting is Image -> Print Size which keeps the image size in pixels and changes the image information sent to the printer.
That scaled up 1200 x 2400 pix image with a 200 ppi setting prints 6" x 12"
Of course, once the image is out of Gimp as a jpg / png / etc for printing, print size (from ppi) can be changed by the printer software but the basic pixel information remains which has a bearing on print quality.