Yellows are hard to find in rock art sites.  This site has a good example.
Second iDStretch test site

Here is an iPhone5 camera image of the site.

iPhone 5 camera image.

The saved YRE enhancement.  Now the red fish behind the black animal on left becomes visible.
YRE Enhancement

The saved YDT enhancement.  Note the yellow animal behind the anthropomorph.
YDT Enhancement

The saved YYE enhancement.  The yellow animal is now dark brown.
YYE Enhancement