Top image: a more complete view of the crab nebula taken from the ESA Digitized Sky Survey Archive. The image itself encompasses a mere 15 by 10 arcminutes, even at this small size features of it's complex structure can be seen. The color image was made using the ESA Fits Liberator with three separate plates: DSS2Red, DSS2Blue, and DSS2Infared (as the green element of the picture). All used Linear scaling.
Middle image: this image has the accented edges filter applied giving a very smooth web-like look that seems to be more detailed than the original.
Bottom image: this is just the original image inverted, which really highlights the 'nebulous tendrils' that almost look like blue blood veins running through the clouds.
This fits liberator image is not available for sale.
Danny LaCrue & the ESA/ESO/NASA Photoshop FITS Liberator