The Indigo Effect

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Indigo is a color, but it is also the name given to a certain style of textile which uses the natural indigo dye as a base for white dotted patterns. Indigo is a traditional dying technique, and the designs are characteristic and immediately recognizable.

 

As usual it is best to use the F8 key to have an idea of what images this effect can create. Manually you can choose:

The background color.
The dot (foreground) color.
The background level (parts of your original image below this level will be shown as regularly patterened areas. Above this level there will be lines of dots following the original image).
The dot color variation and the dot size (a % of the diagonal of the image).
The "density" of the background pattern, i.e. how often it is repeated.
The type of the background pattern, from a simple single dot, to 4 dots arranged as a diamond pattern.
Line "density", i.e. how easy it is to recognise lines of dots as coming from the original image.

 

 

Historical note: When Isaac Newton was splitting white light up into its component parts he saw roughly 6. But this did not fit in with his alchemical view of the world, which said that 7 was a special number. So he added Indigo into the spectrum of named colors thus bringing the number to 7!