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  1. #1
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    Feb 2010
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    Default adob photoshop notes class 33

    724us - adob photoshop notes class 33
    3. This dialog box has (like many others) a checkmark in the Preview field. This means that you immediately can see your changes in the picture as you make them. Try that: Enter the value 3 in both fields:
    722us - adob photoshop notes class 33
    4. You increase both brightness and contrast – but only a little. Can you see that the picture gets a little lighter and brighter?
    5. To study the effect of an adjustment you can click repeatedly in the Preview field while you keep an eye on the picture:

    6. It is easy to see what the adjustment will mean in practice. Here is just a suggestion: In many dialog boxes you can cancel the adjustment by holding the Alt key down. Try that while you have the dialog box Brighness/Contrast on your screen:
    7. Notice the Cancel button. It becomes renamed to Reset when you hold the Alt key down:

    8. Click on Reset, since you are going to try to make this adjustment in a different way. Click on the OK button.
    Adjustment layers

    In stead of adjusting brightness or something else directly in he picture, Photoshop offers a smart alternative. You can insert an adjustment layer, then you can later cancel/modify the adjustments. If you work directly in the picture, it can be difficult to return and correct the adjustment. That is no problem when you employ adjustment layers.
    1. You still have the picture bath.psd on your screen. Choose menu items Layer --> New Adjustment Layer --> Brightness/Contrast…:
    image241 - adob photoshop notes class 33
    2. Click on OK in the dialog box New Layer:
    image242 - adob photoshop notes class 33
    3. Then the new layer is inserted, and you immediately get the same dialog box as before. Enter again brightness 3, and contrast 3.
    4. Click on OK, and save the picture with Control+s.
    5. Look in the layer palette. An adjustment layer had been added, which is a special type layer. Therefore the content in the layer beam is different from what you know in regular layers:
    719us - adob photoshop notes class 33
    6. You can activate the adjustment (in this case brightness/contrast) by double clicking on the adjustment icon. Try that:
    image243 - adob photoshop notes class 33
    7. The double click opens the dialog box Brightness/Contrast, where you then can change the settings as needed.
    With an adjustment layer you can at any time adjust the picture’s light intensity and contrast. You can do that quite independently of which other retouchings you might make. That is smart!
    A brown toning

    The picture needs to be exposed to yet another adjustment, and that is done by inserting another adjustment layer. You need to brown tone the picture, since that is suitable for such an older black/white picture.
    1. You still have the picture bath.psd on your screen.
    2. Start by choosing an orange or red-orange foreground color:
    709us - adob photoshop notes class 33
    3. Then select menu items Layer --> New Adjustment Layer --> Hue/Saturation and accept with Enter.
    4. That opens a dialog box with three sliders. Nothing happens to the picture immediately. But now check the Colorize field:
    image244 - adob photoshop notes class 33
    5. Then the color tone changes to yellow-brown, since the pcture is toned with the foreground color. You can increase and reduce the strength of the toning by dragging the saturation slider towards the right or left, respectively:
    image245 - adob photoshop notes class 33
    6. Try also to drag the Hue slider, which changes the pure color, which is behind the toning:

    7. You can follow the change in the narrow color field in the bottom of the box, while you drag the slider forth and back. Try that – drag the slider all the way from right to left and back again.
    8. Select an orange tone with a color tone value around 30. Drag the Saturation slider to the left, until the picture gets suitably brown, a saturation value around 25 gives the right nostalgic look. Click on OK.
    9. Save the image file again.
    You have now changed the picture’s color tone using the Hue and Saturation functions. They are based on the so-called HSB color system. This system is rather special: The color tone is chosen on a scale, which goes from 0 to 360 degrees. The saturation can have values between 0 and 100. Notice that we do not use the third parameter (brightness) in the exercise.
    Advantages of adjustment layers

    In the last exercise you used two adjustment layers. That was actually not necessary, because you can adjust the picture directly both with brightness/contrast and with Hue/Saturation. But it is still a good idea to insert adjustment layers.
    The advantage of adjustment layers is that you preserve the original picture material unchanged. Thus you avoid canges in the picture’s pixel mass.
    You can completely remove an adjustment any time by dragging the layer down to the waste basket in the bottom of the palette. You can also just temporarily cancel the effect by clicking on the eye to the left of the layer button. You can later change the values for the adjustment by double clicking on the special adjustment icon. That opens the corresponding dialog box, as you have seen already. You can also cancel or change an adjustment at any time. That can be done completely independent of what else you do in the picture.
    Adjustment layers only affect the underyling layers. If a picture consists of multiple layers, you can change the adjustment layer’s placement in the layer palette and with that control, which picture elements will be affcted by the adjustments.
    image247 - adob photoshop notes class 33
    Figure 38. Adjustments can advantageously be placed in adjustment layers, where they technically are separated from the picture layers.

  2. #2
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    Jan 2010
    Lahore, Pakistan
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    very nice keep sharing
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