I tried to make leather material on the sofa object, but the results were quite strange, the leather material seen in the preview render had dark spots in several parts, but the black spots were not shadows because the object was exposed to direct light. When I give the object gray material there is no problem, but when I give it leather material dark spots appear, is there any clue to my problem?????
To remove borders of the bitmap , double click bitmap image go to "bitmap parameters", select "view image" option, crop the unwanted borders of image, check the apply box...