TAILIEUCHUNG - Photoshop CS4 Studio Techniques- P6

Photoshop CS4 Studio Techniques- P6: Staring at a shelf full of Photoshop books at the local bookstore, it seems that there are more special-effect “cookbooks” and technical tomes than anyone would ever care to read. The problem is that none of those “cookbooks” provide enough detail to really let you feel like you understand the program | Chapter3 Layers and Curves Figure Choose Edit Fade Curves to limit changes to the brightness of the image. Figure You can quickly apply a Curves adjustment as a separate layer by clicking in the Adjustments panel. First you can apply Curves to the active layer by choosing Image Adjustments Curves. Immediately after applying Cur ves you can choose Edit Fade Curves and set the Mode pop-up menu to Luminosity Figure . The Fade command limits the last change you made Curves in this case to changing only the brightness of the image. Luminosity is just another word for brightness. It won t shift the colors or change how saturated they are. Your other choice would be to apply Cur ves to more than one layer by clicking the Curves icon in the Adjustments panel. Then you can change the blending mode in the Layers panel to Luminosity Figure . An adjustment layer affects all the layers below it but none of the layers above it. It s also a nonpermanent change because you can double-click the adjustment layer thumbnail in that layer to reopen the Curves dialog and make changes. Therefore any Curves techniques you use for adjusting grayscale images will work on color images if you use the Luminosity blending mode Figure . Figure With a Curves adjustment layer you can make non-destructive changes to an image. Color shifts aren t the only problems you ll encounter when adjusting color images with Curves. The mode your image is in might have an adverse effect on the adjustment. RGB color images are made from three components red green and blue . A bright green color might be made out of 0 red 255 green and 128 blue. When you first open the 136 II Production Essentials Curves dialog the pop-up menu at the top of the dialog is set to RGB which will cause any points to affect the same R G and B values. Clicking that green color in the image displays a circle at 165 on the curve which will affect all the areas that contain 165 red 165 blue and 165 .

Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.