Ive got an image that is quite large. It's a black and white 4878x1497 image. I've finished modifying it but need to scale it down proportionally from 1497 to 72. What's the best way to go about doing that in GIMP?
Scaling the image as is from source will indeed be so small that we are only able to read the text in case we know what it says:
This dramatically improves with the given text with a scale factor only slightly less:
Alas the size of the resulting image will be too large. It is 98 x 30 pixels. This however is not far off the desired size.
So we need to crop this just about legible small size image to 72 x 22 pixels:
It may not be much work to edit the source to center the icons from the left and the right side a bit to have them in the image too. Alternatively you may need to use a slightly bigger font in the original.
According to your comment to the other answer a height of 72 pixels is no issue:
To scale an image in GIMP choose Image > Scale Image.... In the dialog that opens choose to scale by percent, or to a given pixel size. Scale mode "Sinc (Lanczos3)" gives best results.