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01/16/2005 12:34:01 AM · #51 |
Originally posted by jpochard:
Okay..being ignorant again. I don't "get" adjustment layers at all. Can you give me an example? Is it simply a layer where you apply the edit to the whole layer vs. selecting specific sections? For instance an entire image "layer" for contrast tweaking, another layer for saturation etc for the entire image? |
A layer has actual pixels, that is if you turn off all other layers it is still there. An adjustment layer doesn't have any pixels of its own; but instead contains the modifications to make to the layer(s) under it.
The same thing can be done with both types of layers, but the adjustment layer provides more control of the process. For example, I can make a duplicate layer and apply Contrast, Hue and Saturation changes to it, the result being [original+contrast+hue+saturation] -- or I can create three adjustment layers, one for each of the changes and end up with a layer for each. The Background layer contains the image data in its pixels while the contrast adjustment layer contains just the contrast information and so on for the hue and saturation adjustment layers as well. The benefit of this comes when I decide I don't want quite so much contrast; all I have to do is select the contrast adjustment layer and change it. With the duplicate layer method I would be better off starting over.
David
edit: damn fast typers. ;)
Message edited by author 2005-01-16 00:35:25.
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01/16/2005 12:39:31 AM · #52 |
Pochard;
Open an image in photoshop, any image. Use the marquee selection tool (upper left in your toolbox) to select a rectangular area comprising 1/3 of the center of the image, roughly. Save the selection in "selection/save selection" as "rectangle 1".
Go to "layers/new adjustment layer" in menu. Select "Hue/Saturation". Click "ok". This ctreates the layer "hue/saturation 1". You can rename it if you like before clicking ok.
Now you will see the hue/saturation dialogue box. Use the saturation slider and drag it all the way to the left. Notice that in the image the rectangular area loses all color; it becomes grayscale. Click ok to finish this step.
In the layers control box you will now see a thumbnail for this layer that has a white rectangle overlaid over a black background. The white part is the selected area to which the adjustment was applied. Double click on the leftmost graphic in this layer and the hue/saturation dialogue box will pop back up. Adjust the slider from totally desaturated to totally saturated (slide it to the right). Watch the color change. Click ok.
Now click on the original layer to make it the active layer again. Go to "select/load selection" and load the selection "rectangle". See the option to "invert selection". Check that option and click ok.
Now go to "layer/new adjustment layer" and click on "hue/saturation". It will create the layer "hue/saturation 2". Click OK.
With the hue/saturation dialogue box, make some changes in this one as well. Watch how everything thatw as NOT selected in the first adjustment layer now changes in this adjustment layer.
Click ok. See how you now have 3 layers; the second adjustment layer has a black box in the middle of a white field where the first one had a white box in the middle of a black field. The white areas are the parts you are working on in these layers.
Each of these layers can be opened and adjusted as often as you wish. They can be hidden and revealed, as you wish.
That's the basic workflow. These adjustment layers contain no pixels; they just apply
corrections" to the selcted area. An adjustment lauer with no selections ,oaded applies the corrections acroass the entire image.
There are many kinds of adjustment layers; you see them in the "new adjustment layer" dialogue box when you create onw.
Robt.
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01/16/2005 12:49:18 AM · #53 |
| So an adjustment layer that does NOT apply the corrections to the entire image would not be allowed in basic rules, but an adjustment layer applied to the entire image would be allowed? |
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01/16/2005 02:14:37 AM · #54 |
Originally posted by jpochard:
So an adjustment layer that does NOT apply the corrections to the entire image would not be allowed in basic rules, but an adjustment layer applied to the entire image would be allowed? |
This is true. Selections are not allowed under basic editing; so masking an adjustment layer is not allowed.
David
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01/16/2005 03:04:59 AM · #55 |
That's right, pochard. No selection is allowed in basic editing. Also, for some reason, the layer blend mode may not be changed in basic editing. But that's another lesson, and when you create adjustment layers the default blend mode is "normal", which is always legal.
Robt.
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