If you use ImageMagic to process a photo under 20 KB, I will be able to help you with the photo today. In other words, we need to process a .jpg of over kb for less than 20 KB.
I have been using photoshop for half a day, and I cannot meet the requirements. Www.2cto.com is not too big, that is, the quality is too bad. I even changed the photo to black and white, and changed the flowers and clothes on the photo to monochrome, which didn't work very well. It was concluded that it was impossible to maintain a good quality after 20 kb. But google it online,
It seems that EXIF information can be removed to save a lot of bytes. I don't have windows. Fortunately, I have installed ImageMagic before. Please try it out: www.2cto.com Shell code convert original.jpg-strip-resample 72x72-resize 120x160 stripped.jpg where-strip removes EXIF and other information;-resample modifies resolution;-resize modifies the Photo size.
Done.