At no appreciable loss of quality, the screenshots on all my tutorials have been changed from PNG format to JPEG format. Since Weebly's (my website host) server can at times be a little slow, this was done to ensure screenshots load faster (especially if you open them full-size). The total screenshot filesize for some tutorials has dropped to under 1/3 of the original (the narrowband example tutorial dropped from 299MB to 86.4MB). The only tutorial that still uses PNG screenshots is my PixInsight pre-processing tutorial, which ironically goes up in total filesize on JPEG format.