After reading this thread and since I recently have needed to upscale some images, how is the quality of upscaling during export in darktable? All I can find in the manual is this:
allow upscaling
Set to “yes” to perform an upscaling step if the user-defined maximum width and height exceed the original dimensions of the image. If set to “no” the exported image’s dimensions will not exceed the dimensions of the original image (after cropping).
Is it worth the extra work to do the upscaling in another app? The amount of upscaling I need to do is not that much, at most perhaps 30%.