Hot on the heels of the 1.0.3 release I burnt out to finish 1.0.4 with a number of new ordered dithering options, performance tweaks and other nice things - try it online (requires Java 6, you will be shown a security prompt) or download it (more links bottom of this post beneath changes).
You can find out more about what Image to ZX Spec can do here
Here's a sample of the new ordered dither modes, note that although the Spectrum only has 7 effective colours (excluding half bright) the dithering achieves the appearance of many more...
- Added Ordered Dithering and a substantial number of new modes
- Added options control for ordered dither intensity
- Refactored some old code giving a small performance increase
for screen export and error diffusion dithering
- Replaced input folder option with file selector so individual
files can be processed instead
Webstart Image to ZX Spec (i.e. "online" usage - requires Java 6)
Download Image to ZX Spec 1.0.4
Download the Image to ZX Spec 1.0.4 (GPL 2) source code