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Thursday, January 3, 2008
The marquee tool is certainly cool and when you use the SHIFT and ALT keys to add or subtract from the selection, you can create some pretty complex selections. However, often times, a free form selection tool is what you really want. A freeform tool like the Lasso, allows you to draw out a selection area much like you were tracing over an image through tracing paper.
To create a free form selection, simply choose the lasso tool [IMAGE] and click and drag on the canvas. The selection will follow your drag.
Obviously, it is unlikely that you will succeed in making a free form selection right the first time since it is very easy for your mouse to slip. Fortunately, you can use the SHIFT and ALT keys to add or subtract from a selection as well as use the ALT key down while you drag with the lasso to create polygons much like you would do to create lines using one of the paint tools as discussed yesterday.
Note that if you do not perfectly align up the beginning and the ending of a lasso selection, Photoshop will complete it for you by drawing a line from the end to the beginning as the crow flies.
Posted by lusia at 6:11:00 PM
The Marquee tool is the most basic of selection tools and often the one most useful. This tool is used to draw selections based on geometric shapes. Specifically, the marquee tool allows you to draw rectangular and elliptical selections. To form the selection, simply click and drag the mouse.
You can easily choose the geometrical form by changing the value for SHAPE in the options palette.
Notice that there are two special cases of rectangle in which you are constrained to a single row of pixels or a single column of pixels.
Note that a square is a special case of rectangle and a circle is a special case of ellipse. To get a square from a rectangular marquee or a circle from an elliptical marquee, simply press and hold the SHIFT key while you drag out your selection.
An often-desired function is the ability to draw a rectangular or elliptical shape. To do this, simply use the selection tool to define the outline of your shape and then use the EDIT --> FILL or EDIT --> STROKE menu item to either fill or outline the shape.
As you are dragging out your selections, you should notice that selections are drawn outwards from the point at which you initially clicked on the canvas. Sometimes, this can be disconcerting, especially if you are trying to select a circular area around some base point. Fortunately, Photoshop has an answer. To draw the selection out from the center, press and hold the ALT key while dragging out the selection.
Of course, to anti-alias your selection, you can use the anti-alias checkbox or the feather checkbox or both. The feathering checkbox simply affords an extra degree of anti-aliasing.
Posted by lusia at 5:54:00 PM
Well, that is because you needed to learn the fundamentals of Photoshop before you could move on to the more exciting features. Today we will go into some of those more exciting features. In particular, for the first half of the day we will work with "Selections".
Selections are areas within the canvas that you set apart from the rest which you can apply special effects to or other wise modify, copy, cut, flip, move, rotate or scale.
It is important to understand that Photoshop is different from other programs in which you select things. For example, consider your word processor. Most likely, when you want to select a word, you double click on that word. Your word processor knows to select the word because letters are isolate objects.
Photoshop does not have that convenience. When you scan in a picture of a face, Photoshop has no way of discerning between the eyes and the nose on that face. This is because images are pixel based rather than object oriented. Photoshop can manipulate those pixels, but it cannot intelligently differentiate between them in terms of the overall meaning of the picture.
This is a good thing because otherwise, there would be little use for you. Fortunately, you are needed to decide which pixels belong to which meaningful part of a picture. For example, you might want to select a pair of glasses on a face in order to change the color of the frame. Typical reasons to make selections include
* Editing a portion of your canvas
* Creating a mask or layer
* Applying filters and special effects to portions of your image
To select a portion of your canvas, you will have to use one of the selection tools that we will discuss more later. But all selection tools do the same basic task, they draw an outline around some bit of your canvas with a little flashy marquee that looks like a dashed line or a row of little parading ants.
Once you have selected an area, you can manipulate that area in many cool ways. We will do a lot of manipulation of selections over today and tomorrow, so it is crucial that we get a good sense of how to select areas.
Modifying a Selection
We will talk about several tools to make an initial selection however we should mention here that all selections share several properties.
For one, any selection can be deselected just by clicking outside of the selected area or choosing SELECT --> NONE from the main menu
Another such property is that you can edit a selection. This is a good thing because it would suck to create a detailed selection only to realize that you missed one small piece. Fortunately, you can easily add to a selection, remove from a selection or create selections from intersections of other selections.
To add to a selection, simply hold down the SHIFT key and use the selection tool to add to the existing outline.
To subtract from a selection, hold down the OPTION or ALT key (depending on operating system) and use the selection tool to remove from the existing selection
To create an intersection selection, simply hold down the ALT and SHIFT (OPTION-SHIFT) keys and use a selection tool to deselect all but the overlapping portions of two selections.
You can also hide the selection outline if it is getting in the way of your concentration by hitting CONTROL-H
Further, you can inverse the selection, thus selecting everything that was not selected by your selection by choosing SELECT --> INVERSE from the main menu.
There are also several built in selection modification tools int he SELECT menu item. These include Grow, Similar, Border, Smooth, and Expand/Contract. These all modify the selection in predefined ways.
Okay, that is a run down of the qualities shared by all selections. Now let's take a look at the list of tools that you can use to create selections.
Posted by lusia at 5:46:00 PM
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