New Post: Lock/Unlock bits emulation

Thanks.

I have some more questions. Could you help me?

1. How can I convert 8-bit per channel ARGB(32bppArgb) image to 8-bit indexed(8bppIndexed) image ?
2. There is any way to update Image DPI without resampling it? MagickImage.Resample updates DPI but it also changes image size.