I often need to downscale raster images consisting of thick straight lines and other thick curves, like this one:
Using GIMP 2.8.16 and its various interpolation options to resize the image to 600×600 sq. pixels, I obtain the following images:
Now, compare this to the result achieved by Firefox the web browser:
Look, for instance, at the topmost grey line. If you compare1 each of the GIMP-produced images with the one obtained using Firefox carefully, you'll see that in each comparison, the line looks far better in the Firefox-generated image.
Now, as you might imagine, using a web browser to downscale images isn't very convenient, so I wonder if there is any image editor able to downscale images like this as nicely as Mozilla Firefox. I would prefer an easy way to do batch resizing.
1 Make sure your browser isn't applying any interpolation of its own when you view the images. You might want to open a new browser window and open two tabs in it: one with a GIMP version, and the other with the Firefox version. Then use Ctrl+Tab to switch tab quickly. This will make the differences very obvious to most human observers.