XnView Software

xnview wrote:In greyscale, it's smaller because you use JPEG compression, right?

Yes, right. But i can't apply this compression method to B&W-images when store them in PDF. How can i do this?

When i save black and white image in PDF-format, xnview stores them in this manner:

...
/Type /XObject
/Subtype /Image
/Name /Im0
/Filter [ /ASCII85Decode ] :?
/Width XXXX
/Height YYYY
/ColorSpace 11 0 R
/BitsPerComponent 8
/Length 10 0 R
>>
stream
!<<*!s8W-!s8W-!s8W-!s8W-!s8W-!s8W-!s8W-!s8W-!s8W ...