Eliminate all shades of yellow(or other color)?

I want to eliminate all shades of yellow from a picture. It would be ok if they completely dissapeared or if I would be able to turn all shades of yellow into white or black. Is this possible with Photoshop? If not, do you know if it would be possible with other software? Thanks for help!

Example:
There is a sun on a picture- I want the sun to be turned black. I am not talking about using the brush like in "Paint", but I want this to be done automatically.

You can use the Select Colour Range command

Select > Colour Range
In the dialog box, click the Select drop-down menu and choose Yellows
Click OK. This gives you a 'marching ants' selection of all the yellows in the image. At this stage, check the selection to make sure there are no parts of the image selected you don't want to alter. If so, adjust the selection. You can then paint or Fill or Adjust Hue/Saturation in the selection to change the yellow to another colour.