import cv2 as cv
import random
import numpy as np
# Reading an existing exr file
img = cv.imread('Tree.exr', cv.IMREAD_UNCHANGED)
print (img.dtype) \\ this prints float32
img_h = np.float16(img) \\ hoping to typecast float32(float) to float16 (half)
print (img_h.dtype) \\ this prints float16
#cv.imwrite('cropped_tree.exr', img) #this works fine write float32 into exr
#cv.imwrite('cropped_tree.exr', img, cv.IMWRITE_EXR_TYPE_FLOAT) # this doesn't work, gives:
# cv.imwrite('cropped_tree.exr', img, cv.IMWRITE_EXR_TYPE_FLOAT)
# SystemError: <built-in function imwrite> returned NULL without setting an error
cv.imwrite('cropped_tree.exr', img_h, cv.IMWRITE_EXR_TYPE_HALF) # this doesn't work, gives :
# cv.imwrite('cropped_tree.exr', img_h, cv.IMWRITE_EXR_TYPE_HALF)
# TypeError: img data type = 23 is not supported
Python version = 3.6 numpy version = 1.14.5 opencv-python = 3.4.1.15 also tried on other pc with opencv = 3.4.1
the problem seems like opencv doesn't support fp16 even though documentation says so. Also am I using the imwrite function properly?
