gamma :: gamma_correction
The images of His Holiness the Dalai Lama are from the site of Eric Brasseur.
gamma_dalai_lama_gray-isbasic.jpg

basic image handling
time: 0.0127420000
gamma_dalai_lama_gray_tft-isbasic.jpg

basic image handling
time: 0.0104780000
gamma_1-8-isbasic.png

basic image handling
time: 0.0091330000
gamma_2-2-isbasic.png

basic image handling
time: 0.0091310000
The totaltime is only measured for the ImagickResizer basic image handling! Otherwise a comparision with ImageSizers GD-lib is not possible.
Last run was on 11.05.2014 - 19:16, test execution time: 0.0425560000