Use this function to save a picture in JPEG format with an output file size of your choice.
To set your desired output Size in kilobytes, use the slider or enter it numerically. You can also set limits for the compression quality and other JPEG compression settings—sampling, the progressive format, and optimized encoding.
You can also convert the picture to grayscale and choose whether or not to save space by omitting EXIF text information, a preview, and the ICC color profile from the picture.