Problem: Custom quality is not working.
Solution:
1. Open: system/expressionengine/third_party/imgsizer/pi.imgsizer.php
2. On version V2.6.4 Go to row_nr 388 (V2.6.4.0 it’s row_nr 470)
3. Quote: $quality = “100”;
Don’t know why they would overwrite the custom quality.