When you convert a BMP (Bitmap) image to JPEG (Joint Photographic Experts Group) format, the following occurs:
For photographs and web use, yes. JPEG provides much smaller file sizes with good quality. BMP is better when you need lossless quality or are editing images.
Yes, JPEG is a lossy format. Each save/re-save can degrade quality slightly. For archival purposes, keep original BMPs.
Yes, but you won't regain the original quality lost during JPEG compression.
For web use, 70-85% provides good balance. For printing, use 90-100%. Below 70% may show visible artifacts.
This shouldn't happen with photographic images. If converting simple graphics/screenshots, PNG may be better than JPEG.
No, JPEG doesn't support alpha channels. Use PNG if you need transparency.
JPEG converts RGB to YCbCr color space, which allows more efficient compression of color data.
Most converter tools support batch processing - check your specific tool's documentation.
Note: This information is provided as general knowledge about image format conversion. All content here is presented under principles of fair use and intended for educational purposes only. No copyright is claimed on factual information about technical processes which is considered common knowledge in the field of computer graphics. Users are responsible for complying with all applicable laws regarding image use and copyright in their specific jurisdiction.