On Jul 14, 2009, at 1:28 PM, Even Rouault wrote:
Le Friday 10 July 2009 21:14:18 William Kyngesburye, vous avez écrit :
This time I'm taking some Photoshop-created tiffs that I georeference
with a TFW. These tiffs I save with transparency mask (not layers)
to
handle nulls.
Reported by gdalinfo, they appear as:
Band 1 Block=12775x5 Type=Byte, ColorInterp=Red
Mask Flags: PER_DATASET ALPHA
Band 2 Block=12775x5 Type=Byte, ColorInterp=Green
Mask Flags: PER_DATASET ALPHA
Band 3 Block=12775x5 Type=Byte, ColorInterp=Blue
Mask Flags: PER_DATASET ALPHA
Band 4 Block=12775x5 Type=Byte, ColorInterp=Alpha
But when I run gdalbuildvrt on them, they are skipped:
gdalbuildvrt does not support heterogenous band numbers. Skipping
[sometiff].
This warning means that you are giving a list of datasets that don't
have the
same number of bands. For example, if the first dataset examined by
gdalbuildvrt has only 3 bands, it will ignore any further dataset
whose band
number is not 3. (if the error message isn't clear, you're welcome
to suggest
a better one)
Ah, yes, some of the images don't have nulls, and so I didn't save the
transparency.
Is it to generate the vrt with mixed rasters? Maybe merge the vrts of
one set of no-null rasters and one set of rasters with nulls in a text
editor?
Is there a technical reason (in the vrt format) that gdalbuildvrt
can't mix 3-band (no nulls) and 4-band (nulls) rasters? Or is it just
rejecting the mismatches for simplicity?
-----
William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
http://www.kyngchaos.com/
"Time is an illusion - lunchtime doubly so."
- Ford Prefect
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