The software accurately determines the Gaussian function of the major peak, reconstructs the profile and then subtracts it from the profile of the composite peak giving the small peak as difference profile.

Figure 30. The Deconvolution of Three Unresolved Peaks
However, as the resolution becomes less, the need for an accurate deconvolution becomes greater and the value of the software become minimal. A typical extreme example, where deconvolution is useless, is given in figure 30.
It is seen it is virtually impossible to deconvolute the peak into three components. The peaks in the diagram are discernible because the peaks themselves were assumed and the composite envelope calculated. The envelope, however, would provide no basic information; there is no hint of an approximate position for any peak maximum and absolutely no indication of the peak width of any of the components or even how many peaks are present.