19. Photoshop Technique For Checking Exposure (Portraits)
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If you want to check to see if an image is properly exposed in the highlights and the shadows use this Photoshop technique.

Open the image and grab the eyedropper from the tool box, then go to the top of the screen and click on Window then scroll down to Info. A box will appear. Hover the eyedropper over the brightest area of skin (usually a reflection of the main light on the cheek or forehead) and read the "R" reading on the left side of the box. If it is between 236 and 240 the image is properly exposed. If it above 240 it is overexposed. If it is below 236 it is underexposed. There are 32 points in one stop, so if your reading was 225 in the brightest area of skin you are 1/3rd of a stop underexposed (236 minus 11 = 225. One third of 32 is 11.)

To check for underexposure, hover the eyedropper over the darkest shadow that you should have detail in. In a woman with long hair this will be under the ear on the shadow side of the image. This reading should be between 12 and 32. If it is below 12 it is underexposed.

In the example image below, the brightest area was at the black circle on her forehead and it measures 240. The darkest area was under her ear and hair on the shadow side of her face and the area inside the white circle measures 15.

To check this for yourself right click on this image and highlight "Save Picture As" then note where the image was saved to and the name (INFO) then open it up in Photoshop.






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