Objective of allRGB on Sandy Spiral

This image is constructed from:

• Luminance Spiral by Hue
• Base Text and Colours for Objective of allRGB

The idea is to superimpose text on an omnichromatic image in a way that the image remains omnichromatic.

A simple approach is adopted in this experiment:

1. the base text image is used to determine which pixels are within the text area
2. within the text area of the omnichromatic image, the colours of pixels are inverted
3. outside the text area of the omnichromatic image, the colours of pixels that match inverted colours within the text area are also inverted

For most images, this transformation is too disruptive for one reason or another, but for this particular image the inverted text looks reasonably neat and the pixels inverted outside the text area also result in a smooth "sandy" impression.

Image Licence: Public Domain.