Padding image with zeros in DFT

When using discrete Fourier transformation in case 1D and for case 3 D for color images is there a need to do the padding with zeros in the images ? If Yes , how much? Thank you very much

Answer 1

[Walter Roberson]

Usually there is no need to do padding; furthermore, often padding would not be correct. DFT assumes periodic signals, and padding with zeros complicates the periodic function a fair bit.