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I use GIMP to do much the same as Humayun. (Runs on Linux and Windows and is free.)
I scale the maximum dimension to around 1000 pixels.
Select to save as a jpg, and adjust the quality slider until the image is no larger than 200KB. If the quality is below about 85%, go back and make the image smaller.
If you can save it at 100% and the size is less than about 180KB, you can go back and make the image larger.
Every image will need different compression. If it has large areas of similar hue it compresses much more than if it changes a lot.
I just uploaded a 2000x662 pixel image (1324000 pixels ratio 3:1), scaled down from 8521x2820. That worked because it was taken at night.
Andrew
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