limited tif support

[gcode-importer]

Originally reported on Google Code with ID 322

TIF support is currently provided by libtiff but this has some limitations, in particular
when dealing with non-8 or non-16 bits j2k images.

For instance, file6.jp2 from conformance test set is 12 bits per component, but OpenJPEG
produces a decoded tif file with 16 bits per component. This is wrong : the tiff file
should be 12 bits too.

TIF support should be improved/extended to support this kind of cases.

Reported by detonin on 2014-03-31 13:05:19

[gcode-importer]

To rephrase the comment, openjpeg/tiff support is limited. libtiff does handle 12bits
quite nicely.

Reported by malaterre on 2014-04-01 08:27:09

• Labels added: Conformance

[gcode-importer]

Well, it's not what I have been told but that would be a rather good news, meaning that
we do not have to implement inhouse tiff support.

Do you have any idea of the workload to modify imagetotif() function so as to correctly
use the TIF library and output 12-bits image when it's needed ?

Reported by detonin on 2014-04-01 14:44:07

[gcode-importer]

Well, it's not what I have been told but that would be a rather good news, meaning that
we do not have to implement inhouse tiff support.

Do you have any idea of the workload to modify imagetotif() function so as to correctly
use the TIF library and output 12-bits image when it's needed ?

Reported by detonin on 2014-04-01 14:45:10

[gcode-importer]

Reported by detonin on 2014-04-01 14:45:31

[gcode-importer]

@antonin,

I tested what I found in https://code.google.com/p/openjpeg/source/browse/tags/version.1.4/codec/convert.c
& it seemed to work.

However, 12bits TIFF handling disappeared in r745

This is somewhat related to issue 264.
I guess it would be good to get a status on this one before doing any work here.

Reported by mayeut on 2014-10-31 23:24:52

[mayeut]

Closed by PR #535