I use the JPEG encoder color operator to compress image.
I found that the image quality after decompression is a bit abnormal in the horizontal direction.
A is the de-mosaicing color image of "BayerImage" .
B is compressed from A by JPEG.
C is composed of JPEG Gray R,JPEG Gray G, and JPEG Gray B.
You can see the horizontal edge of B that the resolution is reduced. But the vertical edge of B that the resolution hasn't changed much.
When compressing the three grayscale images into JPEG respectively, then compose the three JPEG grayscale images into a color image. The horizontal edge of C that the resolution hasn't changed much.
Please refer "Compare.JPG".
Why is there a difference between the resolution of the horizontal edge and the resolution of the vertical edge after JPEG encoder color operator compression?