I realize they are "only" viewers but they don't seem to have the "click on something gray or white" function to correct an image color shift. All I can find is color correction using sliders. Am I missing something in Irfan or FastStone? Especially FastStone which is quite good for quick and dirty editing.
I am a bit restricted as to to what viewers/editors I can use because my images start life as Sigma .X3F raw files, not the most supported file type on the planet.
My alternatives are Sigma's Photo Pro 5.1 (which is unable to crop!!) and ACR->PhotoShop which is, well . . . Adobe ;-)
Not really looking for suggestions to use anything other than what I have, thanks.