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2009.12.08 17:53 "Re: Problems with multiple strip G4 to single strip G4 tiff.", by Phillip Wiles
Phillip wrote:
>
> If I use this below to write a tiff that started as single strip tiff,
> there is no problem. But when I try to write an image that started out
> as multiple strips it crashes. Do I "need" to save the image multiple
> strips? And if I do, can someone help in the right direction (I have
> experimented to try and force multiple strips with a group 4 image, with no
> luck).
>
> TIFFSetField(out,TIFFTAG_PLANARCONFIG,PLANARCONFIG_CONTIG);
> if(mbCompression){TIFFSetField(tif, TIFFTAG_COMPRESSION,
> mTiffCompression);};
> if(mbSubfileType){TIFFSetField(tif, TIFFTAG_SUBFILETYPE,
> muliSubfileType);};
> if(mbResolutionUnit){TIFFSetField(tif, TIFFTAG_RESOLUTIONUNIT,
> musiResolutionUnit);};
> if(mbXResolution){TIFFSetField(tif, TIFFTAG_XRESOLUTION,
> mfTiffXresolution);};
> if(mbYResolution){TIFFSetField(tif, TIFFTAG_YRESOLUTION,
> mfTiffYresolution);};
> if(mbImageWidth){TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, muliImageWidth);};
> if(mbImageLength){TIFFSetField(tif, TIFFTAG_IMAGELENGTH,
> muliImageHeight);};
> if(mbPhotometricInterpretation){TIFFSetField(tif, TIFFTAG_PHOTOMETRIC
> ,musiPhotoMetric);};
> if(mbBitsPerSample){TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE
> ,musiBitPerSample);};
> if(mbFillOrder){TIFFSetField(tif, TIFFTAG_FILLORDER, musiFillOrder);};
> if(mbSamplesPerPixel){TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL,
> musiSamplePerPixel);};
>
> if(mbuf){TIFFWriteEncodedStrip(tif, 0, mbuf, (muliImageWidth *
> muliImageHeight) / 8);};
> //My attempt at creating multiple strip.
> //if(mbRowsPerStrip){TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,
> muliRowsPerStrip);};
> //tdata_t outbuf;
> //char * p = (char*)mbuf;
> //for(tstrip_t counter = 0; counter < mstrip; counter++){
> // outbuf = (void*)&p[counter * (muliImageWidth * muliRowsPerStrip)/8];
> // TIFFWriteEncodedStrip(out, counter, outbuf, (muliImageWidth *
> muliRowsPerStrip)/8);
> //};
>
>
I have changed the save to:
if(mbuf){TIFFWriteEncodedStrip(out, 0, mbuf, mBufferSize);};
This gives me a black (or all white depending on program used to read
it) image as output from a multiple strip original image. A single strip
original image still works without problems. Both images are Group 4 (I can
post the data from AsTiffTagViewer, if that will help any).
This is my read (which is for the most part the same as the one shown in the
"Using the TIFF Library")
mstrip = TIFFNumberOfStrips(tif);
mBufferSize = TIFFStripSize(tif);
mbuf = _TIFFmalloc(mBufferSize);
mstrip = TIFFNumberOfStrips(tif);
for (tstrip_t tempstrip = 0; tempstrip < mstrip; tempstrip++){
TIFFReadEncodedStrip(tif, tempstrip, mbuf, (tsize_t) -1);
};
I'm using LibTIFF 3.8.2