Hi, is it possible to add option of bmp image conversion with bit selection of 24bits and 32bits?
When writing BMP files, Opus normally chooses the lowest bitdepth that can be used to represent the image, automatically. This (normally) reduces file size, and things which load the bitmap should not generally care how the data is stored (unless they have bugs with some combinations of options, which does indeed happen sometimes with BMP and more obscure combinations of modes, as the format and specification are a mess, but is rare with 24/32-bit BMP files as they are so common).
If you need conversions to a specific depth, creating a button in Opus which uses ImageMagick's convert.exe is probably the best option. That will integrate well into Opus, and has almost unlimited options for output formats and other processing.