...Interesting TP. Whenever someone on Windows compresses, the file remains too large even though the image size is "reduced" to 100 X 100 ...
Instead, all they have to do is resize the image which also reduces the file size.
I will have to get on a mac one day.
I see there is an overlap in terminology here.
When I think resize, I think of changing the actual pixel dimensions. When I think compression, I instead thing of changing at what quality the JPEG saves. Photoshop has a very nice "save for the web" function that lets you preview the image and final size, and adjust the compression accordingly. It also gets rid of extra "stuff" attached to the file that increases its size unnecessarily. I think GIMP has a similar feature.