How do I change geotiff "no data" color to transparent rather than black using arcpy?

[ElizabetJaneRoot]

Hi Team,

I'm having an issue on having black background on tiff image created by ia.Merge using arcpy.

I want the black part to be transparent just like output data when I use sa.Reclassify(raster, "Value", remap, "NODATA")

Best regards,

Hiroshi

[Katherine_Clark]

I had to deal with something similar the other day. What worked for me was going into the symbology pane for the raster layer and changing the value under the "mask" menu:

[ElizabetJaneRoot]

Thanks for the advise @Katherine_Clark 
However, I would like to know how to do it by using arcpy libraries because I'm building an automation process by python script.

Do you might have any ideas?

[ElizabetJaneRoot · Accepted solution]

Never mind, I found solution by myself using,
https://pro.arcgis.com/en/pro-app/2.8/tool-reference/data-management/mosaic.htm

nodata_value parameter let you specify a value what to change into NoData and it will make the background transparent

[Katherine_Clark]

I'm so glad to hear you got it figured out! And thanks for following up and posting your solution here, in case others reference this post in the future 🙂