[Solexatools-devel] compression

[Ben B. <be...@gm...>]

hey brian,

Did you hear back from Klaus on the LZW/TIF issue?   I noticed that  
when i use imageMagick to convert the Solexa tiff's to either LZW- 
encoded TIF or PNG, and then I open the images in either Mac Preview  
or Photoshop, they appear in the inverted color scheme (white spots  
on a black background). When i do a simple "Invert" operation in  
photoshop, it looks the same as the original (by eye).  The two  
documents below talk about "photometric tags" in the tiff file, but i  
haven't figured out yet how to read or manipulate those.  They also  
mention a way to set either polarity=min-is-black or polarity=min-is- 
white, but these seem to be for bi-level (black/white) images.

http://www.imagemagick.org/script/formats.php
http://www.imagemagick.org/discourse-server/viewtopic.php?p=18186

ben.