JPEG compression depends on the detail and complexity of the image. There are also 12 JPEG compression settings. At WPF there is no limit on image dimensions but a 400kB filesize is set.
I suggest 1024px is your maximum longest dimension as people do not want to chase your image around their monitors, this will also limit the file size to approx 400kB. If image is greater than 400kb then when saving choose a lower number (greater compression) and the filesize will reduce.
Enjoy!
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