Crop & resize image to measurements.

[rich2005]

(03-22-2023, 08:08 AM)idiocracy Wrote: Is there a way to create a box that is 90x110mm, place it on the desired subject on an image, then scale the image so the subject fits the desired box and then crop the image?

Because first cropping without knowing if you hit the desired measurements, then scaling without knowing if you scaled too much or too little beforehand. Seems to me to be a long and cumbersome way of doing it.

FYI, i have 0 experience with gimp.

There might be a plugin somewhere that does that but I still advise cropping, then scaling

Set the crop tool as this with delete cropped pixels and a fixed 90:110 aspect ratio

   

Set the crop tool. Crop. scale to 90 x 110 pixels. You should not need to break the link between width and height but Gimp is a bitmap editor and works in whole pixel values. Sometimes rounds up or down.

goes like this https://i.imgur.com/yMPOtWF.mp4

Edit: Just see the millimetre size requirement: A common problem with beginners is using real world units while Gimp is a raster(bitmap) editor and uses pixels. You can print at any size you like, but quality depends on a pixels-per-inch (ppi) value. Scaling need to take that into account.