(SaC) ensures that brighten/darken never breaches 255/0
(SaC) ensures that brighten/darken never breaches 255/0

robstewart57/small-image-processing-dsl-implementations,robstewart57/END-dsl-implementations,robstewart57/small-image-processing-dsl-implementations,robstewart57/END-dsl-implementations,robstewart57/END-dsl-implementations,robstewart57/small-image-processing-dsl-implementations