home *** CD-ROM | disk | FTP | other *** search
- To: BRADY_CLARK_D@Lilly.com
- Subject: Re: TIFF Printing and Storage Optimization
- Cc: tiff@sgi.sgi.com, BRADY_CLARK_D@Lilly.com
- Date: Mon, 19 Dec 1994 08:04:16 +0100
- From: Fredrik Lundh <Fredrik_Lundh@IVAB.SE>
-
-
-
- A few short answers:
-
- > 1) How is the fastest way to print TIFF to post script? I'm looking
- > for the best procedure that produces the easiest to interpret
- > PS...it doesn't have to exist in a product.
-
- Make sure you have a Postscript Level 2 printer, compress the image
- using CCITT Group 4, and finally send it to the printer using tiff2ps.
-
- If that isn't fast enough, get a printer with a faster CPU or go for
- an accelerator board.
-
- I'm probably out of touch, but I do not believe that PSL2 is commonly
- available on printers. If this person is building something for a
- closed environment then they can always just control the printing
- environment and optimize the entire environment. As an example, SGI
- sells a printer+software that's hooked to the host via SCSI and the
- RIP is done on the host. In this case there's not a whole lot of reason
- to optimize the submitted PS 'cuz it's all done on the host.
-
-
- > 3) Are XIP Print boards a good printing solution? Any other vendor
- > boards? I also know that some QMS & XEROX printers can accept TIFFs
- > directly.
-
- *All* level 2 printers accept CCITT/LZW/JPEG compressed data directly;
- check the sources for tiff2ps for ideas on how to utilize this when
- printing TIFF files. Packbits and other runlength encoding schemes
- are fairly simple to implement on level 1 printers as well.
-
- Once again I may be out of touch, but I'm not sure that if a vendor
- suports PSL2 that it also supports all the filters or all the options
- to the filters. Most folks do support the CCITT filters, but certainly
- not JPEG (unless they get their PS implementation from Adobe). My
- experience is that implementing any decoder logic in PostScript in the
- printer is a loss (granted I last tried it back when my printer was an
- Apple LaserWriter).
-
-
- > 4) Ever seen any printing solutions that only send the black part of
- > images to the printer?
-
- Most compression methods compress black *and* white regions before
- sending them to the printer.
-
- It was never stated what type of images were to be printed. If only
- bilevel images are to be printed then my fax2ps program may do the
- job. It generates a highly-encoded PostScript that was designed for
- printers connected to a host with a low-speed serial line. The only
- issue with fax2ps is that it requires the printer PostScript do a good
- job of coordinate precision; if the interpreter is at all inaccurate
- then the resulting image will not look as good as sending the complete
- raster.
-
-
- > 6) Is it possible to remove margins from an image and then save the
- > image with the original image size and then have a TIFF compliant
- > reader reconstruct the orginal image?
-
- Nope. But if you use compression, this is not much of a problem.
-
- Depends on whether the TIFF reader understands the XPosition and
- YPosition tags (probably not).
-
- Sam
-
-
-