'Opencv IMWRITE_JPEG_LUMA_QUALITY parameter doesn't work as expected in 3.2.0

According to the documentation, the IMWRITE_JPEG_LUMA_QUALITY parameter is supported.

IMWRITE_JPEG_LUMA_QUALITY Separate luma quality level, 0 - 100, default is 0 - don't use.

But I realized that when I set it to default 0 (don't use), it still has an impact on the image. This is unexpected, if it's set to 0, it shouldn't have any impact on the image compression.

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c++opencvimage-compressionopencv3.2


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