Create dummy images.
The following images are used for this test.
The following testcases are used for each image.
&nc&so&nc&width=300&nc&height=300&nc&width=300&height=300&nc&bgc=006600
dummy&nc&width=300
(json)
(verbose)
dummy&nc&height=300
(json)
(verbose)
dummy&nc&width=300&height=300
(json)
(verbose)