How to export BigTIFF orthomosaic from v1.6 Python API?

[dyoung]

Hello -- version 1.6 dropped exportOrthomosaic() and now uses exportRaster() with source_data=Metashape.OrthomosaicData. However, exportRaster() does not have a tiff_big parameter like exportOrthomosaic() did. How do I export a BigTIFF using this function? I have tried the following, but it does not work.

Metashape.ImageCompression.tiff_big = True
doc.chunk.exportRaster(path="path/to/file.tif", source_data=Metashape.OrthomosaicData)

I need to use a BigTIFF because with normal TIFF settings, I get: libtiff error: Maximum TIFF file size exceeded

Thank in advance for any help!
Derek

[Alexey Pasumansky]

Hello Derek,

Please see the example below (for version 1.6.0):

Code: [Select]

compression = Metashape.ImageCompression()
compression.tiff_big = True
chunk.exportRaster(path = "path/to/file.tif", source_data=Metashape.OrthomosaicData, compression = compression)


[dyoung]

Ah that makes sense! That worked with a slight modification of the last parameter:

image_compression = compression

Thanks!

[Alexey Pasumansky]

Yes, it should be image_compression, sorry for the confusion.

[sven_a]

Thank I had a similar question. Big tiff is now working.
How can I export data with TiffCompressionLZW?

Thanks!

[Alexey Pasumansky]

Hello Sven,

You should use the corresponding parameter of ImageCompression class:

Code: [Select]

compression = Metashape.ImageCompression()
compression.tiff_compression = Metashape.ImageCompression.TiffCompressionLZW
chunk.exportRaster(path = "path/to/file.tif", source_data=Metashape.OrthomosaicData, image_compression = compression)