Adjust the opacity/transparency of an image on Mac OS Big Sur I thought i'd be able to do this with the built-in Preview app, but I can't find a way to do that.
I have an image i'd like to reduce the opacity to 50%.
Can anyone advise if there's a way to do this with built-in applications that come with MacOS or if this needs GIMP or another image editing tool? I'd rather not install GIMP (if I can avoid it) just for this.
Yes, you're going to need a graphic image editor, be it GIMP, or Pixelmator, or Affinity Photo, or Adobe Photoshop, or other.
Having some sort of program of this type is bound to come in useful again. Preview has its uses, but it's not a general-purpose image editor.