Process photos to 20k or less with ImageMagic

Today, a friend asked me to help me with a photo, saying that I was applying for an exam. I would like to process a 100-k.jpg for 20k or less.
With photoshop changed for a long time, you can't meet the requirements. Not too big, the quality is too bad. I even changed the photo to black and white, and changed the flower clothes on the photo to monochrome, which didn't work very well. Later, it was concluded that it is impossible to maintain a good quality below 20k. But go online google, make sure that someone can use windows drawing program and the like can do it, it seems that removing the information such as EXIF ​​can save a lot of bytes. I don't have windows, but fortunately I have installed ImageMagic before, please come out and try it out: Shell code convert original.jpg -strip -resample 72x72 -resize 120x160 stripped.jpg where -strip removes information such as EXIF; -resample modify resolution ;-resize Modify the photo size. Get it done.