Legacy ImageMagick Discussions Archive

I know that, I want to change the depth 24 to 8 , reduce image size.
It's also a way to adjust the quality. I want to see if there are other ways to solve this problem.

public static boolean zoomImage(String srcImagePath, String newImagePath, Integer width, Integer height, int qual) { try { IMOperation op = new IMOperation(); op.thumbnail(width, height); op.gravity("center"); op.background("white"); op.depth(8);//No effect!! op.extent(width, height); op.quality ...