Re: JPEG-compressed TIFF

"Oliver Schmitt" <schmitt@med.uni-rostock.de> wrote in
message <g69oiv$hg7$1@fred.mathworks.com>...

I find out that tiffcp is able to read/convert different
types of compression within the tiff format. So why not
using something like

smallOne.tif')

what provides some errors:
TIFFReadDirectory: Warning, hugeOne.tif: unknown field with
tag 347 (0x15b) encountered.
TIFFReadDirectory: Warning, hugeOne.tif: unknown field with
tag 347 (0x15b) encountered.
TIFFSetField: hugeOne.tif: Unknown pseudo-tag 65538.
TIFFSetField: smallOne.tif: Unknown pseudo-tag 65537.
TIFFSetField: smallOne.tif: Unknown pseudo-tag 65538.
hugeOne.tif: JPEG compression support is not configured.
hugeOne.tif: Error, can't read tile at 0 0.

However, using the shell with
tiffcp -c jpeg hugeOne.tif,5 smallOne.tif
works good.

So there must be some further things going on when tiffcp is
using jpeg decompression what don'twork either with [x
y]=unix() and [x y]=system().

Another problem is that 5th layer of the multi-tiff is
written to smallOne.tif. However, it is written to a new
file. How could it be possible to redirect the writting
stream directly into "a" matlab matrix?

If imread() should open a JPEG-compressed 24bit RGB Tiff
image the following error message is generated:
??? JPEG-compressed TIFF images are not supported.

Image reading by imread of JPEG-compressed 24bit RGB Tiff
images is not supported. Naturally, such images can be
converted by ThumbsPlus or Irfanview in batch mode.

However if images are huge 100000x200000 pixels and are
layered in the tiff file then they con not converted properly
by these tools.

I wish to open these files directly into a 4D matrix (RGB
with different levels of resolution) in matlab to start
image analysis.

I suppose this could be done by using parts of the build in
imread function and program an imread_jpeg_encoded_tiff()
function?

Has anyone another idea?

Thanks, oliver