Saturday, 8 September 2012

How Selection Work for Digital Design

                             How Selection Work for Digital Design - One of the most powerful features of image editing software is the ability to isolate portion of an image permit local maculation. The area chosen can be anything from a few pixels to the whole image and is referred to as a selection or mask. Most image programs provide a variety of tools and methods for programs provide a verity of tool and methods for the creation of masks and you will utilize these tools more effectively if you understand how masks work.
                        A mask selection is simply a grayscale image that, whensaved, is stored in stored in a channel within the image .these grayscale masks channels and are saved along with the main image. When mask is active it is shown on your image by moving lines of dashes. Which are often referred to as “marching ants”?
                         The beauty of masks having its own channels is that we can reuse it at any time. The mask channel can also be edited allowing changes to the the original selection. The ability to  as a edit the make channels provides are methods of creating the mask channels provides are methods of creating .Also, since masks channels provides are methods of creating  very complicated makes. Also sinc, masks are simply grayscale images, you can use any gray scale image as any source for a mask by copying it to a new alpha channel within your target image.
                      To use a saved mask it requires to load itas a selection onto the image for grater
  Flexibility, masks can be combined in various ways when they are loaded as a selection. This can be great time saver when dealing with complex masks or when dealing with complex masks or when separating parts of an image. Masks can also be copied to other image in the same way as any other image.

The palate shows the adjustment layers and their corresponding masks. To restrict the adjustment layer make a solution before creating it either by creating a new selection or by loading an existing alpha channel.

MARCHING ANTS- In order to isolate the main portion of an image for selection by using polygonal lasso tool.

CHANNELS PALETTE- Alpha channels used for the shown particular area of the image by saving each section as an alpha channel it can be used again as required and alpha channel can be combined in various ways to create new masks.

ALPHA MASKS- Masks can be edited with many of the tools and filters to create unusual masking effects.

PEN POWER AND PATHES- Most image software has a selecting of pen tools that can be used to draw simple and complex shapes may be drawn either freehand, as if sketching with pencil and paper ,or in amore geometric way the outline of the stored within your image file in special path channels.     The pen tool creates curves, which are used to draw shapes defined by mathematical formal when using the pen tool each click of the mouse creates a mode or turning point for the curve. A mode can cause the path to have a Sharpe turn or even a combination of the tow to produce a path of any shape you desire.
A complex curve is made up of multiples nodes that control the way the path bends and twists, too create a node with handles, select the pen tool then click and drag with the mouse. Such mode can have up to two handles, one of on each side of the node. The final shape of a path is determined by the portion of the nodes and the portion of the Handel of each modes and adjusting the handles which complete control over the path shape.  Path created with the pen tool can be used to make complex selection once. A path has been drawn it can be converted into a normal selection to isolate parts of an image. The path can be stored and reduced or changed as desired. The main difference between paths is a mathematical formula and requires very little addition strong in the image file whereas a mask is a raster image and requires much more strange. Paths are also used for creating drawn shapes within an image .Once a path is created it can be stroked of fill and with a color to produce the desired outline or solid shapes.

PATH PALETTE- Path can be stored in the path and named in usual way. A saved path can be amended, converted to a shown here is the completed path for the room best image the path can converted to section so that the head could be copied and pasted onto a new background.

COLOR SELECTION- A powerful selection method provided by image software is the ability to create a selection based on color values. This facility allows a specific range of color to be selected and then manipulated. This can make the selection of very complex shapes easier and is the principle behind the “blue screen” system used in movie making one of the most common uses of color-based selection occurs when you wish to modifying specific colors in an image where in an image where tones blend together, such as when the background to a subject is out of the focus in this type of image it would be impossible to make the necessary selection using any method.
When making a color selection you start by specifying one to the selection as required. The two most useful methods of selecting by color are the magic wand tool and, in some programs, the color range command.
With the magic wand tool the first color can click on specifies to main color, and the tolerance, the more colors, will be included.
The color image command offers even greatercontrol. With this command can simple individual color to be included in the selection, the command can also do partial selections based. On the value of the fuzziness parameter. This is different from the tolerance used with the magic wand, which will not create partial selections.
 After the color selection has been made it can be saved and manipulated like any other mask.

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