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October 2005
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2005.10.13 17:39 "Re: how to update tiled YCbCr JPEG image?", by Eugene Shebeko
> If you're able to reproduce your problem in a suitable small file (like
> 1 megabyte at most), you can send it to my personal e-mail address,
> together with a good description of what you think the image should look
> like, and I'll try and investigate the file and see if I can confirm.
It's really hard to find small tiled image with JPEG YCbCr compression and
that have JpegTables tag :)
But I try same with tiled image with JPEG YCbCr compression but
without JpegTables tag in source file - it work fine.
Then I try to update striped image with JPEG YCbCr compression and
JpegTables tag but it not work at all. I have an assert error at:
tif_jpeg.c:1248 assert(!sp->cinfo.comm.is_decompressor);
It is the code that I use:
int main(int argc,char** argv)
{
char buf[12288];
memset(buf,0,sizeof(buf));
TIFF* tif=TIFFOpen("2.tif","a");
TIFFSetDirectory(tif,0);
TIFFWriteEncodedStrip(tif,0,buf,sizeof(buf));
TIFFClose(tif);
return 0;
}
and image in attachment. Image I get from libtiff samples images quad-jpeg.tif