![]() In Figure 4.32 you’ll notice how as the Exposure was increased the levels expanded to the right. The Histogram panel and image adjustmentsĪs you adjust an image you can observe how this will affect the image levels in the Histogram panel. To find out more about the Lightroom RGB space, please refer to the book’s website. Incidentally, Lightroom uses a wide gamut RGB space similar to ProPhoto RGB to do all the image calculations, and the histogram and RGB percentage readouts are based on this native Lightroom RGB space. Adobe RGB is a popular, commonly used color space, and ProPhoto RGB has the widest gamut of all. sRGB has a small gamut and many of the colors will be clipped when you export. If however you are editing a raw capture, there are no gamut constraints until you export the image as a JPEG, TIFF, or PSD file, at which point the gamut space limit is determined by the choice of RGB output space. If you are editing an imported JPEG, PSD, or TIFF image, the Lightroom histogram represents the tone range based on the file’s native color space. With this particular image the clipping preview shows red and blue channel clipping in the shadows and red color channel clipping and highlight regions. If you want to hide the Histogram panel you can use the (Mac) or (PC) shortcut to toggle collapsing and expanding this panel.įigure 4.31 This shows the Histogram panel with the clipping warning triangles highlighted. The clipping warning triangles themselves also indicate which colors in the red, green, or blue channels (or combination of channels) are initially being clipped most-the triangle colors will eventually change to white as all three channels become clipped. Blue indicates where there is shadow clipping and red indicates any highlight clipping. ![]() You can either roll over or click on the buttons circled in Figure 4.31 or press to toggle displaying the clipping preview shown below. Basically, the Histogram panel provides you with information about the distribution of the levels in an image and also offers you the means to turn the clipping previews for the shadows and highlights on or off-these can indicate where there might be any shadow or highlight clipping in the image. When you are in the Develop module, the Histogram panel is displayed in the top-right corner (there is also a Histogram panel in the Library module, but the histogram in the Develop module has more direct relevance when making Develop adjustments). ![]()
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