LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
November 2003
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
2003.11.03 19:14 "Re: Using libtiff for 16-bit tiff", by Andrey Kiselev
On Mon, Nov 03, 2003 at 06:43:13PM +0100, A dog wrote: > I am trying to use libtiff to open 16-bit tiff images but it appears > black. Is it possible ? I am currently using the function > TIFFReadRGBAImage(tif, w, h, raster, 0) but it returns -1. Do I have > to call another function ? Yes, you need other approach. TIFFReadRGBAImage() was introduced to work well with 8-bit images only. It can handle 16-bit ones, but in very dumb way: by rejecting the least significant part of the word. It is equal to division by 256. It works well for wide dynamic ranges only. You should use low-level functions such as TIFFReadScanline(), TIFFReadEncodedStrip() and TIFFReadTile(). > And my last question, do you have an example in Visual c++ ? Look at the tools directory, there are many examples there. Best regards, Andrey PS. tiff@olimpiacos.org is not functional any more. Please, address your questions to the tiff@remotesensing.org. You can subscribe to the list here: http://remotesensing.org/mailman/listinfo/tiff/ -- Andrey V. Kiselev Home phone: +7 812 5274898 ICQ# 26871517