They were not always intended to be that way.
In its infancy the colorisation process was dreadful.
In the mid 80's the Laurel and Hardy films and Its A Wonderful Life became some of the first colorised material to hit video,and bloody awful it was.
Thanks to those abominations the entire industry was up in arms about it and the results were so poor that broadcast tv even stopped screening them,even ITV.
However ,in the last few years ,like remastering and restoration technology,colorisation has come on in leaps and bounRAB.
While there are an awful lot of B&W films that dont need colorising or would be ruined by colorising there is also a lot of B&W material that was only made without color for budgetary reasons and the creative team would love to have made them in color at the time.
Now its possible to present colorised material and its impossible to tell that it was not made in colour.
The first 2 seasons of Bewitched were made in B&W and to look at the colorised dvd's you would not know.
R1 had the ideal solution of releasing both B&W and color dvd's ,not so with R2 who only got color.
Just a couple of weeks back I got the new 2 disc edition of the Ray Harryhausen classic "20 Million Miles To Earth".
Aswell as copious extras the meat of the release is a disc with the film on where you can switch between the B&W original and a new colorised version using the Angle button.
Ray explains that due to a restricted budget it was not possible to make it in color but color was his preference.
He has sat down with the colorisation people and gone through it piece by piece instructing them on how the colorisation should be done.
Its his original vision and he is overjoyed to see it in color for the first time.
I believe they are doing his "Earth V The Flying saucers" next.
So dont be too harsh on colorising.
There's no doubt that if colorised it enables the return of countless films and tv shows to dvd and tv that would otherwise remain unseen.
And with the excellent results now possible there should be no complaints.
The dvd I mention is the ideal solution .B&W for the purists and the color option for others.
Obviously we dont want Citizen Kane ,Psycho (original) and many others colorised but the process should not be written off like it used to be