11-22-2016, 09:40 AM
Best if you state your OS and version of Gimp, but not absolutely necessary in this case 
Can you give the size in pixels of the two images and the size you are scaling to.
Any scalin g will either lose pixels (scaling down) or guess intermediate pixels (scaling up) and will cause a blurred result.
For scaling down a little, say 50% then a pre-blur helps. A lot depends on your images and their size in pixels.
Some times a regular gimp sharpen can improve the result
Can you give the size in pixels of the two images and the size you are scaling to.
Any scalin g will either lose pixels (scaling down) or guess intermediate pixels (scaling up) and will cause a blurred result.
For scaling down a little, say 50% then a pre-blur helps. A lot depends on your images and their size in pixels.
Some times a regular gimp sharpen can improve the result