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Tessa,
I don't know how the Mac system works, but I'll tell how it works on my PC, in Photoshop.
From a high pixel photo I # 1cut the part I need, f.ex. the head, # 2 set the size to max 600 x 400 pix , # 3 save as, and this is where the option to choose the quality / KB shows up.
I can graduate the quality by sliding a scale, typically around 8-9-10 is where the KB is just below 100 KB, and I type OK and save by a new name in JPEG.
Hope this is a help.
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