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    Default adob photoshop notes class 20

    8. Try to drag the tool all the way around the bear. When you return to the starting point, the mouse cursor shows a small circle. This indicates that the selection can be concluded with a click (or a double click). Try that:
    image136 - adob photoshop notes class 20
    9. If your selection goes totally awry, don’t worry about it. You just have to get used to the magnetic lasso, it is rather special. Read through the next sections, then try again!
    Use the tool correctly







    It is rather easy to select the whole figure with the magnetic lasso. But it can help to know a couple of small tricks:
    1. You can always interrupt the selection with Escape. Then you can start over. Try to do that now, and follow these comments and instructions:
    2. Drag the mouse slowly; so you see the selection follow.
    3. Notice the small anchor points, which are inserted on an ongoing basis:
    image137 - adob photoshop notes class 20
    4. Try to press Delete a couple of times. Each time you press that, the last anchor point is deleted. Continue the selection.
    5. If you employ enlarged viewing, you will encounter a window frame. To be able to continue the selection, you need to hold the space bar down (to activate the hand tool) and drag until you have a fresh section to work on.
    6. Besides, it is a good idea to use the space bar to make a pause in the selection, if you get a spasm in your hand.
    7. Down by the bear’s paw you will encounter a somewhat difficult area, where there are heavier shadows, and the edge may not be so easy to recognize (the contrast is lower). There you could insert extra anchor points by clicking. Try that:
    image138 - adob photoshop notes class 20
    8. Work slowly. Click on your way as needed. If it goes awry, you drag the cursor backwards and press Delete to delete anchor point(s).
    9. Continue the selection. In some places it is wise to insert additional anchor points – such as where the ears start – to make the selection as precise as possible:
    image139 - adob photoshop notes class 20
    10. You may also need a bigger enlargement of the picture: use Control++ while you hold on to the selection with the tool – that can be a tease, so try that!
    <table border="0" cellpadding="0" cellspacing="0"> <tbody><tr> <td valign="top" width="183"> 11. When you reach all the way around, the cursor changes appearance as mentioned, in that a small circle shows up:
    </td> <td valign="top" width="171"> image140 - adob photoshop notes class 20
    </td> </tr> </tbody></table> 12. Then click with the mouse, and the selection is completed. You can also double click to force a conclusion.
    Selection improvements

    Now review the selection carefully – if you are very unsatisfied, you can start over. But if there are only minor errors in the selection, they are easy to correct:
    1. Choose the regular lasso tool:
    image141 - adob photoshop notes class 20
    2. Now you can expand the selection with the Shift- key and reduce it with the Alt key. That is important – remember that!
    3. See the figure below. There the selection is too big. The arrow shows the small area, that needs to be removed from the selection:
    image142 - adob photoshop notes class 20
    4. You do that with the regular lasso and by holding the Alt key down while you start a selection outside the existing selection. Then let the new selection ”cut” the unwanted area away.
    5. You encircle the area with the lasso, so the new selection overlaps the existing. The common area in the two selections is removed. Notice the small minus symbol by the lasso. This indicates that the selection is being reduced:
    843us - adob photoshop notes class 20
    6. When you release the mouse button, the unwanted area is removed from the selection. That is so simple. Here you see the result:
    image143 - adob photoshop notes class 20
    7. The reverse problem is that the selection is too small. That is corrected by adding an area to the selection in the same way as before, but with the Shift- key down.
    8. Notice the small + symbol that follows the mouse cursor. It indicates that the selection is being expanded. Notice also that the new selection actually starts inside the old, which is crosses to get out and select some more:
    image144 - adob photoshop notes class 20
    9. Now you should be able to make a really good selection around the teddy bear.
    Settings for the magnetic lasso

    You have tested the magnetic lasso. If you look in the settings line, there are five parameters, which can be adjusted for the tool:

    Here is a brief review of the parameters:
    Feather gives a softening on both sides of the selection, so the transition between the selected area and the background gets less abrupt. Feathering actually creates some transparency in the border area. Threfore there is also a small loss of picture details. It is best to avoid feahering during the selection. Wait with a potential feathering until the whole selection is in place. Then you have the option to cancel and try again with other values.
    Anti-alias makes the edges less choppy. Smoothes the color transitions in the edges of the selection. Effects only pixels in the edge. Should alwsays be activated.
    Width indicates in how wide a belt the lasso will register edges. You can values between 1 and 256 pixels (try to start with 20).
    Edge Contrast indicates how big the contrast has to be before anything has to be perceived as an edge – use low values in pictures with low contrast contours.
    Frequency indicates the frequency of automatically inserted anchor points. The value can be between 1 an 100. The default value is 57, but we increased it to 80 in the teddy bear exercise.


 

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