The original in 16-bit mode is linear 12-bit acquire using Canon eos*dcs3 camera into Photoshop 15-bit space and then cropped.

Gamma space editing:

1. deteriorate edges (e.g. see the white gauze in the edges of patch numbers),
2. increase noise
3. cause hue-shift in the shadows
4. the image is lightened in overal
5. and the desired effect, sharpening, is much lesser.

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=2.
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=2.
5. save as jpeg using quality factor 4.