In case you suddenly find yourself with an urgent need to convert images into a Spectrum-friendly format (kinda like a craving for chocolate, but less fattening), you may be interested to know that LCD has released a new version of Bmp2Scr. Newness in v2.10c include the addition of SAM Coupe modes 3 and 4 conversion - dithered, error diffusion, midtones... all the usual tools are there. There's also some other tweaks and bugfixes, so it's worth keeping up-to-date.