Significatelly drops image quality

[oleksii-m-baranov]

First of all, thank you for your work. It's awesome.
Unfortunately, I faced issue with significant dropping image quality when tried to use your project.
With command

% blind_watermark --embed --pwd 1234 examples/pic/post-3.png "watermark text" examples/pic/post-3-wm.png

Source pic

is converted to the next one. Here we can see significant quality drop:

I would appreciate if you help me with this issue. Thanks in advance.

[hhzx]

我也遇到了这个问题 图像质量显著下降 肉眼可见的色块化 我宁愿舍弃一些加密 也不希望损失这么多品质 还有可以减少一些区域吗 显著是全区域都铺满了

[PengChaoJay]

我也遇到这个问题了，肉眼的下降，这个如何解决呢