Hi ranran
I appreciate that from your end the exports don't seem to show the grey frames, (contrary to what happens here) yet as you note something has happened related to the Color Adjustments effect as the blue etc. is deeper than in the original image. Nevertheless, as mentioned in my post; do the previews (Clip and Sequence) show changes when the effect values are changed? e.g....
ORIGINAL (before any effects)...........
...and after adding the Color adjustment effect and altering the values....... (Values shown..0; 0; 0.1)
You can see from these two images that the effect has acted correctly on both previews (but not the clip bin copy). If this is not happening then your installation may be faulty. With that particular png image, the previews should show the above result. This is before any export. If, up to this point things are identical (or similar) to the above then we might be able to glean something from the export. The fact that it is a png might also have a bearing on what you are seeing. At this end we can only use the image you uploaded to Google drive which may not have all the properties that it has at your end.
Nat
