I created the image of poppies on black by inverting the L (Luminance) channel of the white version (below) using LAB color in Photoshop.
The white version of the Poppy Medley is a hand HDR combination of five tripod captures with the flowers resting on a lightbox. I used my 85mm PC macro lens, stopped down to f/51, with five exposures at times ranging from 1/2 of a second to eight seconds.
With the five exposures, I created a layer stack in Photoshop, and used masking and the Brush Tool to “paint” in selective transparency.
View this image larger.