StockCharts images are .PNG and the one in that post was 24K. Dailys & higher I can link straight from Stockcharts, but the intradays I have to upload to Mycharts. Still, a quick review of the last 40 charts I uploaded shows 2 groups. One in the 18-19K range and the other 37-39K.
Users also have the option of turning off embedded graphics under "My Setting" section of "Tools".