![]() The histogram may be intimidating at first, but it offers a wealth of information to people who learn its secrets. Like any well-engineered tool, iPhoto’s Adjust palette becomes easier to use as you gain practice. ![]() The result is much truer color and a shapelier histogram. To fix this, I moved the Tint slider to warm up the image while preserving the tonal distribution (so whites stayed white). ![]() In this case, the image became a little too blue overall. Once you have the channels lined up, you may discover additional color problems. In the case of the tunnel picture, I moved the slider to the blue side until all three channels ended at roughly the same place on the histogram-producing a more accurate white. Move the slider to the right to make your image warmer (shifted more towards red) or to the left to make it cooler (shifted more towards blue). To change the alignment of an image’s color channels, use the Temperature slider. Since you need all three colors to produce a true white, the brightest areas of the image appear to be yellow. If you look at the original’s histogram, you’ll notice that the three channels barely overlap-especially in the highlights. Consider, for example, my picture of a tunnel (See third and fourth screenshots).
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