***  For details on how to be removed from this list visit the  ***
***          CCP4 home page http://www.ccp4.ac.uk         ***


> Ick - TIFF is an evil, encumbered format.  Use PNGs (which also use
> more efficient and free lossless compression algorithms):

I'm not sure what you're thinking of here.

TIFF is a file format, not an image encoding scheme.
Inside that TIFF file may be a raw RGB image, or a RLE 
(run length-encoded) image, or some proprietary compression format,
or indeed a PNG image.

The thing that makes it TIFF, and the reason journals tend
to request it, is that at the front of the file is a header
section that contains envelope information like desired
image size, resolution, enddian-ness, comments, and a whole
slew of other things.  So it actually is more reasonable to 
request TIFF than a bare PNG file for this purpose, since the
PNG standard  doesn't even *have* a way of providing such envelope
information.  There are some hackish work-arounds that stuff it
into a comment records, but it is widely ignored, or interpreted
idiosynchratically, by image display programs.

-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle 98195-7742

Reply via email to