The original in 16-bit mode is linear 14-bit acquire using Umax PowerLook III scanner into Photoshop 15-bit space and then cropped.

Sharpening in gamma space:

1. deteriorates edges (e.g. see the white gauze on her cheek that borders with the dark backgound.
2. The eye areas gets gauze.
3. Noise is boosted severely in the the dark backgound area at lower right.
4. The letters gets gauze.
5. The overall sharpening is weaker.

Linear space processing

1. Open the original linear higher bit-depth image.
2. convert to 8-bit mode.
3. apply USM at amount=500%, radius=0.5, thereshold=0.
4. apply inverse gamma 2.2.
5. save as jpeg using quality factor 4.

Gamma-space processing

1. Open the original linear higher bit-depth image.
2. apply inverse gamma 2.2.
3. convert to 8-bit mode.
4. apply USM at amount=500%, radius=0.5, thereshold=0.
5. save as jpeg using quality factor 4.