importing functions from image package to core

[John W. Eaton]

On 15-Oct-2012, Carnë Draug wrote:

| Hi
| 
| there's a bunch of simple functions on the image package that I think
| could be moved to octave core (even though they used to belong to the
| matlab image processing toolbox). These are the isbw, isgray, isind
| and isrgb.
| 
| The reason I propose the move is that some functions in core already
| perform this checks but have their own code.

Which functions do that?

| This functions are very
| simple and would cause very little maintenance issues while reducing
| repeated code.
| 
| If no one objects, I can prepare a changeset with them.
| 
| By the way, matlab removed this functions because of
| 
http://blogs.mathworks.com/steve/2007/03/09/what-happened-to-isgray-isind-isbw-and-isrgb/
| Not sure about the best approach there.

It seems like these functions are not really very useful.  So why
should we have them?  I'd vote for deprecating them instead of moving
them to core Octave.

jwe