Is it possibile combine an RGB image and an IR image in a FOUR-BAND tiff image?

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Hi all,
I'm looking for a function to build a four-band image. I have an RGB image and the corrispective IR image (in greyscale), and I need to merge them in a 4-band image.
I tried 'imfuse' but the result is just a 3-band (RGB) image a bit darker.
Any suggestion?
Thanks a lot

Accepted Answer

Walter Roberson
Walter Roberson on 28 Mar 2020
Tiff class can be used. The IR can be placed into Extra Samples. I seem to recall that you can also directly write an array with 4 panes in Tiff class as long as you give the right bit depth information.
I also encountered a hint that you can imwrite an array with 4 panes to tiff file and that it will write as-if it were rgba

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