Merge pull request #454 from aleju/color_temperature

Color temperature augmentation

changelogs/master/added/20191013_change_color_temperature.md

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+# New Augmenter ChangeColorTemperature #454
+
+* Added augmenter `imgaug.augmenters.color.ChangeColorTemperature`.
+* Added function `imgaug.augmenters.color.change_color_temperatures_()`.
+* Added function `imgaug.augmenters.color.change_color_temperature_()`.

checks/check_color_temperature.py

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+from __future__ import print_function, division
+import numpy as np
+import imgaug as ia
+import imgaug.augmenters as iaa
+
+
+def main():
+    image = ia.quokka_square()
+    images_aug = []
+    for kelvin in np.linspace(1000, 10000, 64):
+        images_aug.append(iaa.ChangeColorTemperature(kelvin)(image=image))
+
+    ia.imshow(ia.draw_grid(images_aug))
+
+
+if __name__ == "__main__":
+    main()