Adobe 29180155 User Guide - Page 84
To adjust sharpening in camera raw files, Reducing noise in camera raw images
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ADOBE PHOTOSHOP ELEMENTS 4.0 79 User Guide Shadows Specifies which input levels are mapped to black in the final image. Moving the slider to the right increases the areas that are mapped to black. This sometimes creates the impression of increased contrast in the image. Using the Shadows slider is similar to using the Black Point slider for input levels in the Levels command. Hold down Option while moving the Shadow slider to preview where the shadows are clipped. Move the slider until the shadows begin to get clipped, and then reverse the adjustment slightly. Color indicates areas that are being clipped in one or two channels, and white indicates unclipped areas. Brightness Adjusts the brightness of the image, much as the Exposure slider does. However, instead of clipping the image in the highlights (areas that are completely white, no detail) or shadows (areas that are completely black, no detail), Brightness compresses the highlights and expands the shadows when you move the slider to the right. In general, use the Brightness slider to adjust the overall brightness after you set the white and black clipping points with the Exposure and Shadow sliders. Contrast Adjusts the midtones in an image. Higher values increase the midtone contrast, and lower values produce an image with less contrast. Generally, use the Contrast slider to adjust the contrast of the midtones after setting the Exposure, Shadow, and Brightness values. Saturation Adjusts the color saturation of the image from -100 (pure monochrome) to +100 (double the saturation). To adjust sharpening in camera raw files The Sharpness slider adjusts the image sharpening to provide the edge definition you want. The Sharpness adjustment is a variation of the Unsharp Mask filter, which locates pixels that differ from surrounding pixels based on the threshold you specify and increases the pixels' contrast by the amount you specify. When opening a camera raw file, the Camera Raw plug-in calculates the threshold to use based on the camera model, ISO, and exposure compensation. You can choose whether sharpening is applied to all images or just to previews. 1 Zoom the preview image to at least 100%. 2 Click the Details tab. 3 Move the Sharpness slider to the right to increase sharpening and to the left to decrease it. A value of zero turns off sharpening. In general, set the Sharpness slider to a lower value for cleaner images. If you don't plan to edit the image extensively in Photoshop Elements, use the Camera Raw's Sharpness slider. If you do plan to edit the image extensively in Photoshop Elements, turn off Camera Raw sharpening. Then use the sharpening filters in Photoshop Elements as the last step after all other editing and resizing is complete. Reducing noise in camera raw images The Detail tab in the Camera Raw dialog box contains controls for reducing image noise-the extraneous visible artifacts that degrade image quality. Image noise includes luminance (grayscale) noise, which makes an image look grainy, and chroma (color) noise, which is usually visible as colored artifacts in the image. Photos taken with high ISO speeds or less-sophisticated digital cameras can have noticeable noise. Moving the Luminance Smoothing slider to the right reduces grayscale noise, and moving the Color Noise Reduction slider to the right reduces chroma noise. When making Luminance Smoothing or Color Noise Reduction adjustments, it's a good idea to first zoom in on the preview image for a better view.