On Sun, Mar 27, 2011 at 12:45 AM, TP <[email protected]> wrote:
> On Sat, Mar 26, 2011 at 7:42 AM, zdenko podobny <[email protected]> wrote:
> >> Can somebody explain why a tif size (2480x3508 @ 8BPP) is not processed?
>
> The test image has 16 bpp.
>
> Interesting. How did get this information? I tried:
- identify (imagemagick): TIFF 2480x3508 2480x3508+0+0 8-bit Grayscale
DirectClass 1.556MB
- infranview "says": Original colors: 65536 (16 BitsPerPixel);
Current colors: 256 (8 BitsPerPixel); Number of unique colors: 41;
> This is not tesseract but leptonica issue (library used for image
> handling).
> > When I run it on linux I got error message comming from leptonica (1.67
> -> I
> > did not try 1.68 on linux yet):
> > Error in pixReadFromTiffStream: spp not in set {1,3,4}
> > Error in pixReadStreamTiff: pix not read
> > Error in pixReadTiff: pix not read
>
> I get same warnings on with Leptonica v1.68 on Windows XP SP3.
>
> > On Windows leptonica "release version" library did not show error/warning
> > messages because of compile option "NO_CONSOLE_IO"
> > (see http://code.google.com/p/leptonica/issues/detail?id=42).
> > It looks like leptonica did not support lzw compression for tiff (
> > see http://www.leptonica.com/source/README.html "9. Image I/O" - lzw is
> > mentioned in png and gif section, but not with tif). I change
> > tif compression from lzw to zip (BTW: this will cause smaller image),
> > tesseract will produce ouput (on XP SP3).
>
> Incorrect. At least on Windows I build libtiff with "LZW_SUPPORT =
> 1"
> in my nmake.opt file.
>
> You can see the actual problem by looking at
> http://tpgit.github.com/Leptonica/tiffio_8c_source.html#l00274, where
> Leptonica gets the TIFFTAG_SAMPLESPERPIXEL. It allows 1, 3, or 4 but
> not 2 as this image contains.
>
Thanks for clarifying this. As I mention It was just my guess based on my
observation of README :-)
>
> -- TP
>
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