2018.11.13 14:14 "[Tiff] TIFF image has depth 0, bits per sample value 16
and samples per pixel value of 1", by Olumide
Thread
2018.11.13 14:45 "Re: [Tiff] TIFF image has depth 0, bits per sample value 16 and samples per pixel value of 1", by Roger Leigh
On 13/11/2018 14:14, Olumide wrote:
Dear List,
I'm trying to analyze an image that has:
depth 0
bits per sample value 16
samples per pixel value 1... see below. What sort of image is this? It does not fit the mould of any of the image types here http://www.mit.edu/afs.new/sipb/project/scanner/arch/i386_rhel3/bin/html/vuesc13.htm
uint32 depth = 0;
uint16 bitsPerSample, samplesPerPixel;// Returns 0
TIFFGetField( tif, TIFFTAG_IMAGEDEPTH, &depth );// Returns 16
TIFFGetField( tif, TIFFTAG_BITSPERSAMPLE, &bitsPerSample );
// Returns 1
TIFFGetField( tif, TIFFTAG_SAMPLESPERPIXEL, &samplesPerPixel );
The latter two values look pretty normal for a 16-bit greyscale or indexed image.
The ImageDepth however, is as far as I know a non-standard extension for describing the Z dimension size, to complement ImageWidth and ImageHeight. Is the tag actually present in the source image, if you run tiffinfo on it?
If not present, I would have thought it would be logical for it to default to 1 rather than 0, since it's still a plane of depth 1.
If it is present with a size of 0, that would seem to be a broken image.
Maybe something which libtiff might be able to work around?
Regards,
Roger