You can download a particular sample by shift-clicking on it’s gradient; save it and use it to tone your own images, as described in my tutorial Sampling Toned Images with The GIMP. Note that the displayed gradient is not the same as the sample gradient! i.e. don’t right-click to save the gradient with the text on it, shift-click to save the link target! Alternatively, you can also download the entire collection of samples as a single compressed folder
If you find a great toned image somewhere or come up with one yourself and you’d like to see it added to this collection, please send me the gradient as prepared as described in the tutorial. If you have a particular name in mind send it along in the email message body.
p.s. I am also looking for traditionally (wet darkroom) toned images to use in verifying the authenticity of some of these “classic” tones. If you have such an image, I would appreciate it if you could send me a small digitized copy of the image; it need not be any bigger than 300-400 pixels in any dimension (just big enough to contain the full range of color values in the image). Alternatively, if you see one on the web, please point it out. I am currently looking for good examples of any interesting historical tonings.
Single color/value tones
In these tonings, for each luminosity value only one color is defined. Each color can have different shades, and there may be more than one color in the sample (e.g. a quadtone would have four different colors), but each color only occupies a unique range of luminosity values.
Contributed by Pablo Coronel
Multiple color/value tones
In these tonings, for each luminosity value several tones may be defined. This generally means that they were not sampled from a toned B&W image (at least in the traditional sense), but from a color image. To use these tonings the way they were sampled, be sure to check the “Use Subcolors” option when using these samples with the Sample Colorize filter.