Fix subsampling issues for BMP plugin

[haraldk]

See overrides of ImageReaderAbstractTest.testReadWithSubsampleParamPixels with @Ignore annotations.

There are also issues left with subsampling sub-component (ie. 1, 2, 4 bits/pixel, packed ushort 565/4444 etc) types in the TIFFImageReader.

JPEGLossless currently does not support subsampling.

More rigorous testing should probably be applied to other formats as well. :-)

[adriannuix]

Hi Harald,

Do we have any updates on this? A customer is asking...

Thank you Adrian

[haraldk]

Hi Adrian,

The TIFF subsampling is in progress. BMP no, JPEG lossless no (though I obviously want to fix these too, as soon as possible). What is your customer's requirement?

I wish I could, but I can't promise any dates as long as this is a spare time project that I don't make any money from. Feeding the family must come first. :-)

But as mentioned above, there are test cases for this, that you could enable and fix, if you are in a hurry.

Best regards,

-- Harald K

[adriannuix]

Hi Harald,

I understand and sympathize with that. We have some 2 types of rendering for some image files like tiff. One large that works and one small that does not work on Tiffs because of the issue. We'll probably release in a week or so as we are not on fixed schedule. It's not a do or die but it's an outstanding bug that's been there for a while.

Cheers, Adrian

On Fri, Jul 21, 2017 at 7:52 PM, Harald Kuhr [email protected] wrote:

Hi Adrian,

The TIFF subsampling is in progress. BMP no, JPEG lossless no. What is your customer's requirement?

I wish I could, but I can't promise any dates as long as this is a spare time project that I don't make any money from. Feeding the family must come first. :-)

But as mentioned above, there are test cases for this, that you could enable and fix, if you are in a hurry.

Best regards,

-- Harald K

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[haraldk]

Seems most of this is fixed for the TIFFImageReader. Postponing the remainder for the BMP format to later version.