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The
Adjustment layer enables the color tone to be corrected without changing the original image
or degrading the image quality. To correct the color tone of an image, use Level Compensation,
Tone Curve, Hue and Saturation and so on. Color tone correction makes the image apparently
beautiful, but it also results in tonal jumps, color saturation and degraded image data at
the same time. If color tone correction is performed repeatedly, the
data is further degraded. To prevent the image data from being degraded, limit the
number of color tone corrections to the minimum number. There are, however, many cases where
correction needs to be performed many times, and this degrades the image data.
The Adjustment layer plays a role in preventing this problem. This
procedure creates an adjustment layer on the image you wish to correct so that the corrected data becomes available without
changing the image itself. Also, even if you decide on the correction once, it is possible to
redo the correction without modifying the image by rewriting the correction information. The disadvantage of this
procedure is that it increases the data volume and you are restricted to saving the image in the Photoshop format. However,
it is very convenient in that the color tone can be corrected repeatedly. |
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You can create an Adjustment
layer from the Layers palette or the Layer menu. In the example, we will look at how to create an
Adjustment layer on the Layers palette that can be operated intuitively.
There are eleven correction functions for creating an Adjustment layer including Level Compensation and Hue and Saturation. |
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This is the state of the original
image and the layer before processing. The only layer is the current background layer. |
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New Adjustment Layer button, the menu is displayed. Select which function to use. In the example,
Tone Curve is selected. |
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When you select the function
at Step 2, the function is immediately initiated and you are able to correct the color tone. Perform
the correction and click the OK button. |
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The image is corrected and the
Adjustment layer is created at the same time. Confirm that the adjustment layer has been created
on the Layers palette. |
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It is possible to re-correct
the adjustment layer created by retrieving the correction information. Since the original image is
not changed, the image data is not degraded irrespective of how many times you perform the process.
This is one of the characteristics of the function. |
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This is the state of the image
for which the color tone was corrected using the Adjustment layer for the Tone Curve, and the Layers
palette. To correct the color tone again, double click over the Adjustment layer on the Layers palette. |
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The Tone Curve is activated,
and the dialog window is opened. Make sure that the correction of the Tone Curve remains. The Adjustment
layer means the layer that retains the correction information. |
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Correct the layer by Tone Curve
again, and click OK. The Tone Curve dialog box closes and the image is corrected again. The adjustment
layer of the Tone Curve remains in the Layers palette. |
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If there is no need to performing
the correction again, you can merge the adjustment layers. If the layers are merged into one, all
the layers merge into the layer called Background. This applies to all layers including the Adjustment
layer. It is okay to save the layers, but images that contain layers must be saved in the Photoshop
format. They cannot be saved in JPEG or other formats. Therefore, the file volume becomes larger
when saved. If you are inconvenienced due to a shortage of free disk space, delete the Adjustment
layers. |
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Select Merge Layers from the
submenu of the Layers palette. |
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All layers are merged into the
Background layer. |
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To compare the images
before and after correction using the Adjustment layer, you can turn the Adjustment layer
on and off. To hide the effect of the Adjustment layer (which does not mean to disappear),
click the eye icon for the Adjustment layer on the Layers palette. The eye disappears
and the correction effect of the image disappears as well. If you click over the position
of the eye icon again, the eye reappears and the correction effect is displayed.
If you attempt to merge the layers and the Adjustment layer is not displayed, a message appears asking whether to discard
the layer that is not displayed. If you click OK, the layers merge without including the effect of the Adjustment layer. |
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If the Adjustment layer that
you have created becomes unnecessary, it is possible to delete it. Select the adjustment layer you
wish to delete on the Layers palette and click the delete button. Alternatively, drag and drop the
Adjustment layer onto the delete button. |
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Select the Adjustment layer you
wish to delete and select Delete Layer from the submenu. Alternatively, drag and drop the Adjustment
layer onto the delete button. |
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A dialog box asking if you wish
to delete the Adjustment layer appears. Click OK to delete it. |
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The Adjustment layer will be
deleted. Since the correction effect of the Adjustment layer disappears at this time, the image returns
to the state before the correction is performed. |
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![These supplementary functions are used during retouching.]](../../images/reference/function/menu_photo_e.jpg)
