Mixed light scenes, such as tungsten and daylight, can wreak havoc on getting accurate or visually pleasing image color. Two options work well to get neutral color quickly in mixed lighting scenes. If you're shooting RAW or sRAW capture, one option is to shoot a gray or white card as described in the earlier sidebar. The second option is to set a custom white balance. Setting a custom white balance balances colors for the specific light used when you set the custom setting. It is relatively easy to set, and it's an excellent way to ensure accurate color.
Hp For my work, I alternate between setting a custom white j balance and shooting a white card for color balancing batches of images during RAW conversion. Both techniques work in the same general way, but they differ when you set the white balance. With one, you set it on the site; with the other click-balance technique, you set it during image conversion. Both techniques involve roughly the same amount of time and effort.
Another advantage to custom white balance is that it works whether you're shooting JPEG or RAW capture in a Creative Zone mode. Just remember that if light changes, you have to set a new custom white balance.
To set a custom white balance, follow these steps:
1. Set the camera to a Creative Zone mode (P, Av, Tv, M, or A-DEP), and ensure that the Picture Style is not set to Monochrome. To check the Picture Style, press the Picture Style button on the back of the camera. The Picture Style screen is displayed. To change from Monochrome (black and white), turn the Quick Control dial to select another style, and then press the Set button.
Hp Ifs best to have the white balance set to anything except Custom White Balance when you begin these steps. Occasionally, I've had the 40D refuse to import data from a white card shot when the white balance was already set to Custom.
2. In the light that will be used for the subject, position a piece of unlined white paper so that it fills the center of the viewfinder (the spot metering circle), and take a picture. If the camera cannot focus, switch the lens to MF (manual focusing) and focus on the paper. Also ensure that the exposure is neither underexposed nor overexposed such as by having Exposure Compensation set.
3. Press the Menu button, and then press the Jump button until the Shooting 2 (red) menu appears.
4. Turn the Quick Control dial to highlight Custom WB, and then press the Set button. The camera displays the last image captured (the white piece of paper) with a Custom White Balance icon in the upper left of the display. If the image of the white paper is not displayed, rotate the Quick Control dial until it is.
5. Press the Set button again. The
40D displays a confirmation screen asking if you want to use the white balance data from this image for the custom white balance.
6. Turn the Quick Control dial to highlight OK, and then press the Set button. A second confirmation screen appears.
7. Press the Set button one last time. The camera imports the white balance data from the selected image and returns to the Shooting 2 menu.
8. Press the Shutter button to dismiss the menu.
3.7 This shot was taken using the Shade White Balance setting. The image shows a green colorcast in the shadow areas and in the yellows of the top of the mushroom, neither of which is truly accurate to the original scene colors. Exposure: ISO 100, f/3.5, 1/50 sec.
9. Press the Metering Mode-WB button above the LCD panel, and then turn the Quick Control dial to select Custom White Balance. This is denoted by two triangles on their sides with a black square between them. The custom white balance remains in effect until you change it by setting another white balance. All of the images you take will be balanced for the custom setting.
3.8 This shot was taken after I set a custom white balance using a small white index card. The colors in the image reflect the colors in the scene as I recall them. Exposure is the same as the previous image.
When you finish shooting in the area for which you set the custom white balance and move to a different area or subject, remember to reset the White Balance option.
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