UV fit in picture while baking Firstly, I am a beginner in blender and my English is not good.

I have a single object with several materials and would like to bake all the materials in a single image. The problem is that the UV is larger than the output image, because each material has textures of different dimensions and when I do the bake, the output image is cut off.

Will I have to redo my UV, or is there anything I can do to make the output image fit?
In object mode select the object with RMB and Ctrl A to apply (object/apply/scale)..then go to edit mode press u to unwrap..i have same issue before and this tips solve mine..i wish it helps you as well..