Showing Hot and Cold Areas in Your Images

Images may occasionally have overly bright areas where color information is beyond the standard limits of the Aperture working color space. For example, white areas in an image brightly lit with direct sunlight, or bright flashes off a water surface, may be so bright that their color is outside the working color space. Similarly, images may occasionally have black areas where color information is below the standard limits of the working color space. Aperture can display these “hot” and “cold” areas of an image with tints on the image to help you identify hot and cold areas. You may be able to adjust the areas identified by the hot and cold area overlays and recover highlight and shadow detail by changing the exposure, the recovery, the black point, or the gamma setting of the image.

To show the hot and cold areas in your images
  • Choose View > Highlight Hot & Cold Areas (or press Shift-Option-H).

You can also monitor color clipping per color channel when performing specific adjustments using modifier keys. For more information, see Using Modifier Keys to Identify Color Clipping.

You can choose to view the hot and cold overlays in color or monochrome.

To change the clipping overlays display color
  1. Choose Aperture > Preferences, or press Command-Comma (,).

  2. In the Preferences window, click Advanced.

  3. Choose either Color or Monochrome from the “Clipping overlay” pop-up menu.

You can adjust the threshold or sensitivity of the hot area overlays. By default, the threshold is set to 100%. You can set Aperture to flag pixels that are near the 100% mark by lowering the threshold in the Preferences window.

To adjust the hot area display threshold
  1. Choose Aperture > Preferences, or press Command-Comma (,).

  2. In the Preferences window, click Advanced.

  3. Drag the Hot Area Display Threshold slider to the left to increase the sensitivity to highlight pixels, and to the right to decrease it.

You can also adjust the threshold or sensitivity of the cold area overlays. By default, the threshold is set to 0%. You can set Aperture to flag pixels that are near the 0% mark by increasing the threshold in the Preferences window.

To adjust the cold area display threshold
  1. Choose Aperture > Preferences, or press Command-Comma (,).

  2. In the Preferences window, click Advanced.

  3. Drag the Cold Area Display Threshold slider to the right to increase the sensitivity to shadow pixels, and to the left to decrease it.