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error.lua

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require"imlua"

local filename = "lena.jpg"

local image = im.FileImageLoad(filename)

local image2 = im.ImageCreate(image:Width(), image:Height(), im.GRAY, im.USHORT)

-- Both calls will signal an error because of incompatible parameters

--im.ConvertDataType(image, image2, im.CPX_REAL, im.GAMMA_LINEAR, 0, im.CAST_MINMAX)

im.ConvertColorSpace(image, image2, im.CPX_REAL, im.GAMMA_LINEAR, 0, im.CAST_MINMAX)