At the location /internal-roxen-* in your webserver you'll find some images which are always available to be included in image tags and the like. The most useful of these are /internal-roxen-unit, which is a 1x1 pixels big transparent GIF image. Small transparent images are often used by HTML layout designers to create spaces between other elements.
At the location /internal-roxen-pixel-* you'll find a 1x1 nontransparent pixel in the selected color. Examples are /internal-roxen-pixel-blue or /internal-roxen-pixel-ff34c0. The colors are decoded as describe in Color attributes.
All images that reside in the directory server/roxen-images in your Roxen WebServer distribution is available through /internal-roxen-*. All the images available in the server/roxen-images/dir directory is available through /internal-gopher-*. E.g. if you want to put the image help.gif on your page, just use <img src="/internal-roxen-help" />. Note that the look of the images as well as the contents of server/roxen-images may vary.
The following images will always exist with the same look and size:
The following images will always exist, but may change in appearence.
In order to easily create a multistage color selection widget you can acces automatically generated saturation bars through the /internal-roxen-colorbar URL. /internal-roxen-colorbar:h,b,w returns a 30x256 pixels big color bar with the hue h,the brightness b and a white marker at the location w, 0 being the bottom and 255 the top. The interval for all three variables are 0-255. The intended use is to first present the user with a two-dimensional hue/brightness selector, as shown above. The selected combination is then used as basis for which colorbar to show, where the user can selected the preferred saturation.
The code above will generate the 11 colorbars shown below. All of them has brighness set to 255, but their hue will range from 0 to 255 in with steps of 24.