subject: Digital photo color correction fix image quiz - image processing, pre-press - printing industry [print this page] Digital photo color correction fix image quiz - image processing, pre-press - printing industry
1, I do not know what in the editing process when the image was sharpened when.
As a general rule, want to sharpen the image editing process, as one of the last few steps. It works well for CameraRaw images, in which the image is always in the 16-bit mode, sharpening the implementation of the task, and then to print or screen view and the file reduced to 8-bit mode. The exception to the rule is 8-bit image is converted into 16-bit, in order to implement color correction step, variegated reduced, and the implementation of all hues to adjust. For 8-16 conversion, the first sharpening the image, and then reduce the image of the sample.
2, I have to complete brightness and contrast adjustments, why are the dark red of the photos?
Use the "Levels" and "curves" adjustment dark, underexposed image will lead to over-saturation, a large number of variegated, and lots of color halo. Use the "Levels", "curve" or "shadow / highlight" for the simple adjustment of brightness and contrast of these images were not in the best way to adjust the tone.
There needs to use more than one copy of the layer, and use the "color filter" model "applied image" command, while 50% of the non-transparency of the layer stack in the use of "normal" and "Brightness" mode. In this way the image data can be obtained to prevent over-saturated images with a large number of variegated red and. To use this type of correction, you can record what you did, these operations including the creation of the necessary adjustment layers, and add about 5 different layers to fine-tune after the results.
3, many of my images seem too cold or too warm. Are there easy to change the image correction method to adjust the tone?
In many cases, the use PhotoFilter this simple application you can make the image warmer or colder certain number. Not always use the "Hue / Saturation" dialog box to carry out this type of correction. See Chapter 10 regarding the use of adjustment layers PhotoFilter introduction to learn more about changing the image tone for more information.
4, I still not sure the "Levels" slider to adjust the brightness and contrast where. For such adjustment, if any standard rule of thumb?
Remember, if carried out in the background destructive adjustment, it will not be able to recover lost data. Can always use the "Levels" adjustment layer and return to the "Levels" dialog box on the adjustments made to fine-tune, and does not destroy any image data.
As a general rule of thumb, see "Levels" dialog box of the histogram and learn it, and determine the high-light and shadow zone where no data. Try to observe the color difference between missing and variegated. Often variegated as the bottom line appears in the histogram, protruding from both ends of the last histogram to 0 or 255 Levels. Move the slider white field and black-market, do not let them and the last (or first) appears adjacent image data. To slightly reduce the number of histogram of protrusions and other color adjustments. When using the adjustment layer
If you need to return to the "Levels" dialog box, you can easily accomplish this operation. Double-click the adjustment layer will open the "Levels" dialog box. You can then move the white field and a little black market slide, on fine-tuning adjustments made. To get used to assess the straw black market and white market, find a neutral color balance, this time will be fully aware of where to move the slider up.
5, the image has a large number of high light and shadow areas, adjust the brightness and contrast is always a problem. How to adjust these images?
Can not make global adjustments in the image. Sometimes isolated areas of high light and shadow, and to adjust them separately. First, try using the "shadow / highlight" command, and see if able to successfully complete the excellent tone adjustment.
