multilayer tif to flattened Tif

[johanwieland]

A Tif with 2 or more layers (generated by Photoshop CC 2018) can easily be flattened to png, jpg, etcetc. But to convert multilayer.tif to singlelayer.tif is not succesfull, the result of

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magick multilayer.tif -flatten flattened.tif 

has the same layerstructure.
Tested it with different versions of IM 6.99, 7.06 and 7.08 (6.99 only on Macintosh platform, the 7.x version on Windows server
Does anyone has a solution for this?
Regards, Johan

[fmw42]

Can you post your input TIFF file to some free hosting service that will not change the format (for example try dropbox.com) or zip the file before posting and then put the URL here so the Imagemagick developers can test with it.

[johanwieland]

A sample multilayer-tif on dropbox:
https://www.dropbox.com/s/b1wcqvn2xd60c ... m.tif?dl=0

[fmw42]

I can confirm that the flattened tif still has two layers. Tested using Imagemagick 7.0.8.12 Q16 Mac OSX Sierra and checking with Photoshop.

[fmw42]

Here is a workaround that seems to produce a 1-layer tif

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convert rotterdam.tif PSD:- | convert - -flatten result.tif

[johanwieland]

That seems to work, but with a strange side effect: some metadata disappeared.
In the File Info/Origin i gave the fields CITY and Country a value. And that is gone after the convert. But Copyright Info URL kept his value.
converting from tif to psd seems to change some metadatafields.

[fmw42]

It was a crude workaround. A proper enhancement to handle layered tiffs is needed to do it correctly.