Pansies--Yellow Ones On Black Background
This is a striking composition in both version.
While I generally like (and use) white backgrounds, the black version works better for me. But, part of that might be the processing. The colors are more saturated on the black-background image. At first, I thought might just be an illusion due to the contrast with black, but when looking at both images side-by-side and looking mainly at the middle flower, I think that is correct. Let me know if I am right. Also, the processing brought out some spots on some of the petals (e.g. the ones at 2:00 and 10:30).
That then begs the question: How would the white-background image fare with more contrast? Or, maybe even less?
Wish I could see the final printed version(s).
I like the black background far better than the white. It makes the flowers the center-piece of the image. The 255 white background distracts from the image and hurst the eyes on computer screens because they are back=lit and there is too much brightness in the background. I am sure the white background is very effective for your purposes of bringing out the texture of the paper you're printing on. Outside of prints, for web/screen presentation, I prefer the black background. Also, you could put in a dark texture in the background too - it doesn't have to be 0 black.