I associate Hawaii with color. But I took several photos during the blue hour and they aren’t exceptionally colorful, so I tried a few of them out in black and white.
For Cee’s Black and White Photo Challenge: Matching Things (it’s a stretch, but they are waves hitting the same lava rocks with the same clouds in the sky.)
All photos were taken with my Sony RX10iv. I use Raw Therapee to do the basic adjustments then load the resulting .tif files into the GIMP. I used Nik Silver effects to convert to black and white, then did some touch up and added a vignette using the GIMP.