tailieunhanh - Photoshop cs5 by steve Johnson part 33

Sử dụng điều chỉnh Photo Filter Các điều chỉnh Photo Filter cho phép bạn áp dụng một bộ lọc màu hoặc cụ thể cho hình ảnh. Áp dụng điều chỉnh Photo Filter một hình ảnh tương tự như cách đặt một bộ lọc màu trước một ống kính máy ảnh. Nhiếp ảnh gia sử dụng bộ lọc để giúp đỡ các vấn đề màu sắc chính xác kết hợp với điều kiện ánh sáng độc đáo như ánh sáng mặt trời buổi sáng sớm hoặc ánh sáng huỳnh quang trong nhà | Using the Photo Filter Adjustment The Photo Filter adjustment lets you apply a specific filter or color to an image. Applying the Photo Filter adjustment to an image is similar to placing a colored filter in front of a camera lens. Photographers use filters to help correct color problems associated with unique lighting conditions like early morning sunlight or indoor fluorescent lighting. You can use Photoshop s Photo Filter adjustments to get the same results using color density and luminosity options. Use the Photo Filter Adjustment Open an image. Click the Image menu point to Adjustments and then click Photo Filter. Click the Filter option click the Filter list arrow and then select from the available color filter options. Click the Color option to select a user-defined color filter. Drag the Density slider left or right to adjust the intensity of the filter effect on the active image. The higher the value the greater the effect. Select the Preserve Luminosity check box to preserve the color of the image highlights. Select the Preview check box to view changes to the active image. Click OK. o Cooling Photo Filter applied to the image 0 Chapter 8 Understanding Colors and Channels 207 Using the Invert and Equalize Commands The Invert command reverses the colors and tonal values to their opposite values in effect creating a negative. The Equalize command exaggerates contrast between similar color values. It s useful in finding stray pixels in a seemingly solid color or to produce a special color effect. Use the Invert Command Open an image. Click the Image menu point to Adjustments and then click Invert. The brightness values of each image channel are reversed creating a negative color or grayscale image. Use the Equalize Command Open an image. Click the Image menu point to Adjustments and then click Equalize. The brightness values of the image pixels are distributed in a way that more accurately represents the entire range of brightness levels from white to black.