Can reference rater (tiff) file in combined DGN vector format be converted to DFX format?

Yes, I just opened this DXF file, and I can see all raster (tiff)  is gone. :( Any solution how to convert it without losing references?

Igor Soaltys said:

I just opened this DXF file, and I can see all raster (tiff)  is gone

Does DXF support raster attachments (XREFs)?  As it's AutoDesk's file format, you should first verify on an AutoDesk forum whether their product supports raster. 

If the DXF specification does not support raster, then your customer can't expect a file exported from MicroStation to include those TIFF files.

Sir, how do I know if DXF supports raster? I'm asking here.

Google says DXF can support raster format, but unfortunately it wasn't created when I Exported DGN to DXF .

What are your settings for export? I found this discussion (from a few years ago):
https://communities.bentley.com/products/microstation/f/fileformats-forum/68986/export-to-dwg-deleting-raster-attachments

While it is old, it may be worth looking at your Export/Save as settings to see if any change there makes a difference.

Igor Soaltys said:

How do I know if DXF supports raster?

There are several questions you should ask:

1. Does DXF support embedded raster images?
2. What version(s) of DXF support which image formats (BMP, TIFF, JPEG etc)?

Igor Soaltys said:

I'm asking here

For answers to the above questions, go to the inventor of DXF, which is AutoDesk.  Why expect people on a MicroStation Forum to be knowledgeable about another developer's products?

3. Does MicroStation support DXF export?
4. What version(s) of DXF does MicroStation support?

For answers to those questions, consult MicroStation help or post here. 

as mary has hinted you have to set the external refs settings to merge in the dxf settings ..you  haven't told us the raster format and what  it is of... ie jpg logo

personally I would give the client a  pdf of the drawing showing the raster ref attached, a dxf export ( to the highest version of acad you can export allowed) and a copy of the raster file just in case  they can better attach it in their own software as the same raster format .. I believe the merged raster becomes a BMP and may or may not lose some quality.

If the raster was a simple logo you could vectorise it to dwg on line convertors abound as well as scan to cad, then tweak it in mstn  ref attach > merge ref to your dxf .. so its not a raster anymore.. but I wouldn't do it to a map ...

as mary has hinted you have to set the external refs settings to merge in the dxf settings ..you  haven't told us the raster format and what  it is of... ie jpg logo

personally I would give the client a  pdf of the drawing showing the raster ref attached, a dxf export ( to the highest version of acad you can export allowed) and a copy of the raster file just in case  they can better attach it in their own software as the same raster format .. I believe the merged raster becomes a BMP and may or may not lose some quality.

If the raster was a simple logo you could vectorise it to dwg on line convertors abound as well as scan to cad, then tweak it in mstn  ref attach > merge ref to your dxf .. so its not a raster anymore.. but I wouldn't do it to a map ...