Và một yếu tố rất quan trọng là tốc độ bus. Điều này đề cập đến các tốc độ truyền dữ liệu từ bộ nhớ RAM đến CPU (đơn vị xử lý trung tâm, tức là các chip). Hiệu suất CPU có thể được hạn chế bởi tốc độ xe buýt làm chậm hệ thống như vậy nhanh hơn là tốt hơn, đặc biệt là đối với các tác phẩm Photoshop khối lượng lớn dữ liệu luôn luôn được xử lý. | Martin Evening Adobe Photoshop CS3 for Photographers Figure The Shadow Highlight adjustment dialog shown here in basic mode. Checking the Show More Options box will reveal the Advanced mode dialog shown below in Figure . Figure The Show More Options mode Shadow Highlight dialog contains a comprehensive range of controls. I would advise you to always leave this box checked. Correcting shadow and highlight detail The Shadow Highlight image adjustment enables you to reveal more detail in either the shadow or highlight areas of a picture. Shadow Highlight is a great image adjustment tool to use whenever you have useful tonal information but it is just too compressed to be seen properly. It can be used to perform wonders on most images not just those that desperately require corrections to recover detail in the shadows and highlights. The Shadow Highlight image adjustment tool makes adaptive adjustments to an image and it works much in the same way as our eyes do when they automatically compensate and adjust to the amount of light illuminating a subject. The Shadow Highlight adjustment works by looking at the neighboring pixels in an image and making a compensating adjustment based on the average pixel values within a given radius. In Advanced mode the Shadow Highlight dialog has various controls which allow you to make the following fine-tuning adjustments. Amount This is an easy one to get to get to grips with. The default Amount setting is 50 . Increase or decrease this to achieve the desired amount of highlight or shadow correction. I find this default setting does tend to be rather annoying so I usually try setting the slider to a lower amount or zero and click on the Save As Defaults button to set this as the new default setting for every time I open Shadow Highlight. Tonal Width The Tonal Width determines the tonal range of pixel values that will be affected by the Amount set. A low Tonal Width setting will narrow the adjustment to the darkest or .
