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May 2005
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2005.05.25 04:52 "Re: Question about Jpeg-in-tiff, JPEG IN TIFF created by libtiff can't be read by acdsee", by Kelvin Zhong
> Show us your current code. If you use the strip interface, and you need to write
> a single strip, the modification should probably be as easy as adjusting the
> rowsperstrip value, I think.
Thanks Joris.
i show you some codes i did with the 24 bitcount Image here:
//dibImage is a class do some operation on DIB data.
BITMAPINFOHEADER* pBitmapHeaderInfo=dibImage.GetBitmapHeader();
DIBINFO* pDibInfo=dibImage.GetDIBInfo();
if( pBitmapHeaderInfo == NULL || pDibInfo == NULL)
return FALSE;
uint32 height=pBitmapHeaderInfo->biHeight;
uint32 width=pBitmapHeaderInfo->biWidth;
uint16 bitcount=pBitmapHeaderInfo->biBitCount;
uint16 bitspersample;
uint16 samplesperpixel;
uint16 photometric=0;
uint16 compression;
uint32 x, y;
uint16* r=NULL;
BYTE* buffer=NULL;
//samplesperpixel = ((bitcount == 24) || (bitcount == 32)) ? (BYTE)3 :
(BYTE)1;
samplesperpixel = (bitcount == 24)? (BYTE)3 :(BYTE)1;
bitspersample = bitcount / samplesperpixel;
photometric = PHOTOMETRIC_YCBCR;// PHOTOMETRIC_RGB;
compression = COMPRESSION_JPEG;
// handle standard width/height/bpp stuff
TIFFSetField(m_tif, TIFFTAG_IMAGEWIDTH, width);
TIFFSetField(m_tif, TIFFTAG_IMAGELENGTH, height);
TIFFSetField(m_tif, TIFFTAG_SAMPLESPERPIXEL, samplesperpixel);
TIFFSetField(m_tif, TIFFTAG_BITSPERSAMPLE, bitspersample);
TIFFSetField(m_tif, TIFFTAG_PHOTOMETRIC, photometric);
TIFFSetField(m_tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
TIFFSetField(m_tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
uint32 rowsperstrip = TIFFDefaultStripSize(m_tif, (uint32) -1);
TIFFSetField(m_tif, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
// handle metrics
TIFFSetField(m_tif, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH);
TIFFSetField(m_tif, TIFFTAG_XRESOLUTION,
(float)(pBitmapHeaderInfo->biXPelsPerMeter * 254.0 /10000) + 0.5f);
TIFFSetField(m_tif, TIFFTAG_YRESOLUTION,
(float)(pBitmapHeaderInfo->biYPelsPerMeter * 254.0 /10000) + 0.5f);
TIFFSetField(m_tif, TIFFTAG_COMPRESSION, compression);
TIFFSetField(m_tif, TIFFTAG_JPEGQUALITY, 100);//m_nJpegCompressQuality);
//TIFFSetField(m_tif, TIFFTAG_JPEGCOLORMODE, JPEGCOLORMODE_RGB);
TIFFSetField(m_tif, TIFFTAG_ROWSPERSTRIP,
height);//((7+rowsperstrip)>>3)<<3);
..........
buffer = (BYTE*)malloc(pDibInfo->dwEffWidth);
if ( buffer == NULL)
throw _T("Not enough memory");
for (y = 0; y < height; y++) {
// get a pointer to the scanline
memcpy(buffer, pDibInfo->pImage + (height - y -
1)*pDibInfo->dwEffWidth, pDibInfo->dwEffWidth);
// TIFFs store color data RGB instead of BGR
BYTE *pBuf = buffer;
for (x = 0; x < width; x++) {
BYTE tmp = pBuf[0];
pBuf[0] = pBuf[2];
pBuf[2] = tmp;
pBuf += 3;
}
// write the scanline to disc
if (TIFFWriteScanline(m_tif, buffer, y, 0)==-1){
free(buffer);
buffer = NULL;
throw _T("Error in writing!");
}
}
free(buffer);
buffer =NULL;
When i use TIFFSetField(m_tif, TIFFTAG_ROWSPERSTRIP, height);
it seems the jpeg-data was writed as a single strip.but ACDSEE still can't
opened it.
I tried to save the JPEG-IN-TIFF as
photometric = PHOTOMETRIC_YCBCR;// PHOTOMETRIC_RGB;
compression = COMPRESSION_JPEG;
but all the image i tried to create can't be opened by ACDSEE,
I didn't know where the problem is, probably would be "TIFFWriteScanline"
function ?
Or is there another way could do it ?
such as "Attach" & "Detach" the JPEG-data into(out of) TIFF file as a single
strip(or tile), without doing compress or decompress the image data.
thus save the time & image quality ,is it possible ?
does anyone do some research on it ?
I would be very appreciate to you for sharing some knowledge with me ,
Thanks in advance.
Kingore@126.com