file type (should be 0x4d42): 4d42
file size: 131352138
offset to image data: 138
header size: 124
width: 8000
height: 5473
planes: 1
bits: 24
load time:   0.0977
1 threads, invert time:   0.5633
2 threads, invert time:   0.2824
3 threads, invert time:   0.1877
4 threads, invert time:   0.1420
save time:   0.0001