CLXXVIII
A painter must study his picture in every degree of light; it is all little enough. You know, I suppose, that this period of the day between daylight and darkness is called “the painter’s hour”? There is, however, this inconvenience attending it, which allowance must be made for—the reds look darker than by day, indeed almost black, and the light blues turn white, or nearly so. This low, fading light also suggests many useful hints as to arrangement, from the circumstance of the dashings of the brush in a picture but newly commenced, suggesting forms that were not originally intended, but which often prove much finer ones. Ah, sometimes I see something very beautiful in these forms; but then I have such coaxing to do to get it fixed!—for when I draw near the canvas the vision is gone, and I have to go back and creep up to it again and again, and, at last, to hold my brush at the utmost length of my arm before I can fix it, so that I can avail myself of it the next day. The way to paint a really fine picture is first to paint it in the mind, to imagine it as strongly and distinctly as possible, and then to sketch it while the impression is strong and vivid.
I have frequently shut myself up in a dark room for hours, or even days, when I have been endeavouring to imagine a scene I was about to paint, and have never stirred till I had got it clear in my mind; then I have sketched it as quickly as I could, before the impression has left me.
Northcote.