LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
December 2004
Previous Thread
Next Thread
Previous by Thread
Next by Thread
Previous by Date
Next by Date
Contact
The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems
Thread
2004.12.07 16:46 "Re: Fetching pixel data from 4bit tiff", by Dan Field
Bob Friesenhahn wrote: > > You should use TIFFReadScanline() to read each scanline into memory > you have allocated. There is one scanline per row. The scan-line is > returned packed according to the TIFF specification, with two samples > per byte. It is a small matter of masking and shifting to obtain each > nibble. The only tricky case is to properly handle an image with an > odd number of columns. This appears to work with rows though. I need to sample from columns aswell as rows. Is there any way to take a vertical scanline with this function? -- Dan Field <dof@llgc.org.uk> http://www.cymruarywe.org/ http://www.walesontheweb.org/ Developer / Sysadmin Llyfyrgell Genedlaethol Cymru