so every time i generated material from image its generated all the maps except the metallic map
Hello @MH1 and welcome to our community!
To generate a metalness map with a Materialize Image project, you can enable it under the Metalness section in the Graph Object Editor panel on the right.
From there, you can select a color from the input image using the Mask Color parameter to generate a mask and determine where the material is metallic.
In addition, you can also choose to supply your own grayscale image as a mask.
If you have any further questions, please don’t hesitate to ask. 
Thanks!
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