[ome-devel] Required TIFF IFD Fields in OME-TIFF?

[Curtis Rueden]

Hi Nick,

Of perhaps more importance: does OME care about IFDs? Are there required IFD
> data? Or does the completeness of my IFDs only make the file more compatible
> with TIFF readers and not really effect OME? Like, could I just skip the
> details in the TIFF IFDs and just have things like ImageWidth, ImageLength,
> etc, which I'm sure the bio-formats tools need to correctly parse the data?


OME does not specifically care about any IFD values, no -- at least, not any
above and beyond what would normally be required for a regular TIFF. You
should populate exactly what you would normally populate if the file were
not OME-TIFF. Any overlap between OME metadata and TIFF IFD values (SizeX
vs. ImageWidth, SizeY vs. ImageHeight, etc.) should be consistent -- if it
is not, Bio-Formats will issue a warning message and the resultant behavior
may not be what you want.

-Curtis

On Tue, Sep 8, 2009 at 5:48 AM, Nick Perry <nperry at stanford.edu> wrote:

> To expand on my question:
>
> If I have a lifetime channel in my image, and I want to put it in a TIFF
> file format, then the IFD for that lifetime channel plane at a given Z, Time
> could have:
>
> BitsPerSample = 16 (if each 'pixel' in this plane should be read as a
> SHORT)
> PhotometricInterpretation = 1
> SamplesPerPixel = 1
>
> Is this about right?
>
> Of perhaps more importance: does OME care about IFDs? Are there required
> IFD data? Or does the completeness of my IFDs only make the file more
> compatible with TIFF readers and not really effect OME? Like, could I just
> skip the details in the TIFF IFDs and just have things like ImageWidth,
> ImageLength, etc, which I'm sure the bio-formats tools need to correctly
> parse the data?
>
>
> On Tue, Sep 8, 2009 at 9:49 AM, Nick Perry <nperry at stanford.edu> wrote:
>
>> In creating an OME-TIFF file, are there specific TIFF IFD fields that are
>> "standard" to use in OME-TIFF files? Which are they? Is there any sort of
>> documentation available for this?
>>
>> Thanks,
>> Nick
>>
>
>
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