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Tuesday 22 May 2012

How to Select Image Areas in Phoshop CS3


How to Select Image Areas

Course of Action: Create a New Document
To create a New document;
1. Choose File and click New
2. In the New dialog box, specify the desired settings
3. The click OK.

Course of Action: Make a Selection
To make a selection using Rectangular Marquee tool
1. Open the document where you want to create a selection.
2. On the Tools palette, select the Rectangular Marquee tool.
3. Position the cross hair cursor at the location where you would like to short the selection and drag to make a rectangular marquee selection.
4. If necessary, continue hold down the mouse button and the spacebar to move a selection as you draw it.

Make a Selection using Elliptical Marquee tool
1. Click and hold the Rectangular Marquee tool without releasing the mouse click and, from the flyout, select the Elliptical Marquee tool.
2. Position the cross hair cursor at the location where you would like to start the selection and drag to make an elliptical marquee selection
3. If necessary, you can hold down the mouse button and the spacebar to move a selection as you draw it.


How to make a freehand selection using Lasso tool
1. Select a lasso tool
2.  a) Click at the outer edge of the object or on the portion of the image to be selected and drag to make a freehand selection; or
     b) Hold the Alt key and click at the outer edges of the object to create a selection.
3. Release the mouse button to end the selection at the same location you began.


Make a selection based on a color using Quick Selection tool
1. Click and hold the Magic Wand tool and, from the flyout, select the Quick Selection tool.
2. Position the cross hair cursor at the location where you would like to start the selection and drag to make selection. You can also click it once if the background is a solid color, like (black, white, red etc).
3. If necessary, choose Select and click Deselect, or choose keyboard shortcut Ctrl+D to remove the selection.


Hint:
Deselection in Photoshop
Whenever you want to remove a selection, you should always choose the Deselect command in the Select menu. Unlike with other graphic application, you should not simply click in a blank space to deselect when using Photoshop. Since the entire image is made up of individual pixels, there is no empty or transparent space in a Photoshop image unless you add layers. White space is a single-layer image is simply a large area of white pixels.


Confine Selections
Sometimes it is vital that the selection area you create with the Rectangular or Elliptical Marquee tools be a perfect square or circle. You can confine the marquee tools to create squares or circles by holding down Shift while using the marquee tools.


Inverse Selection
When you make selection using the selection tools, you can inverse the selection if necessary. To inverse, click Select in the menu bar and click Inverse.  For keyboard shortcut key; press and hold Shift+Ctrl+I.



Tips:
Perhaps you are not familiar with the Photoshop tools, but you want to try your hands to learn Photoshop by yourself. To know the tools and their names, point the mouse pointer on the tool in the Tools Palette, and it will display the name of that tool.







Saturday 19 May 2012

Photoshop CS3 Selection Tools


Photoshop CS3 Selection Tools

The Marque tools
The Marque tools allow you to select geometric areas in images. The following table describes the different types of marquee tools.

Tools
Description
Rectangular Marque tool
Used to select geometric areas such as boxes


Elliptical Marquee tool
Used to select geometric areas such as circles. You can move and transform the selection marquee.

Single Row Marquee tool
Used to create a border as pixel-wide row

Single Column Marquee tool
Used to create a border as a pixel-wide column.



Floating Selection and Fixed Selection
A floating selection refers to a select group of pixels that float above the background image when moved from their original spot. The background will remain unaffected when you move the same selection to another spot. However, if you deselect the pixel group, it will become a fixed selection and get fixed at the current position.

Cropping a Row or Column of Pixels
You need to use the Single Row Marquee tools to select extra row or column. This is useful when you have to delete an extra row or column of pixels from an image that includes just a bit of the background.


The Lasso Tools
The Lasso tools are used to select complex areas in an image. The following table describes the different lasso tools.

Tool
Description
Lasso  tool
Used to make free form segments of a border.

Polygonal Lasso tool
Used to make straight-edged segments of a section border. You can also use it to select areas that are made up of straight lines.

Magnetic Lasso tool
Used to select portions of an image with complex edges that set against a high-contrast background. It allows you to accurately select image areas that contain many colors



The Magnetic Lasso Tool Options Bar
The Magnetic Lasso tool options bar contains several additional options that affect how the Magnetic Lasso tool functions.

Option
Description
Feather text box
Allows you to specify how soft the resulting edges will be when a selection is completed.

Anti-alias check box
Allows you to specify the detection width in pixels.

Contrast text box
Allow you to specify a value that enables the Magic Lasso tool to detect the edges in an image.

Frequency text box
Allows you to specify how often Photoshop places points on the path.




The Quick Selection Tool
The Quick Selection tool used tool is used to make a accurate selection of complex shapes using an adjustable brush. When you drag the brush, the selected areas expands along define edges of the image. You can also hold on the shift key and click around the selection to select.


The Magic Wang Tool
The Magic Wand is used for selecting pixels of an image that are similar in color or brightness with a single click. I mean, when the background has a solid color. You can use this tool to select contiguous pixels by using the contiguous check box on the options bar.


The Tolerance Option
The Tolerance option allows you to specify the Magic Wand tool’s sensitivity to color differences. In Photoshop, each pixel within an image is coded with color and brightness information. While using Magic Wand tool, you can specify the range or tolerance of pixels selected to ensure that only pixels similar in color to the pixel you clicked with the Magic Wand tool will select; the lower the tolerance, the smaller the area that the tool will select.   


The Anti-Aliasing Feature
Anti-aliasing is a feature that allows you to smoothen edges by placing light pixels around a selected object. It is often used on text to create the illusion of smoother curves.   

Friday 11 May 2012

Working with Image Areas (Lesson 1)


Working with Image Areas
Introduction
Now you are familiar with exploring the Photoshop environment and the components in it. You would like to create a drawing and work on it. In this lesson, you will select image areas using the various selection tools in Photoshop.

While working with an image, you might need to work on its specific areas. Your selection may be different according to your requirement. However, you can easily make the most complex selections using the built-in tools in Photoshop.

Image Resolution
Image resolution is the sharpness and clarity of an image. It is the number of pixels in the horizontal or vertical direction and is measured in pixels per inch (ppi). The greater the ppi of an image, the higher is its resolution and quality.
Image resolution is used to determine the image data value along with its pixel dimension.

Color Mode
Color mode is defined as the mode that is used for displaying and printing images. It determines the number of colors, channels, and the image file size. The color mode is based on the color models used by images during publishing.

Example:




Different Color Modes in Photoshop
Photoshop images can be classified into different color modes based on the color information they contain. Some of these modes are specific to black and white images.

The table below describes the various color modes in Photoshop

Color Mode
Description

RGB Color
It uses three channels to represent color. Each color component is red, green, or blue can use 256 shades. The RGB color mode is most commonly used for images distributed electronically. It is also used by monitors and scanners.


CMYK Color
It uses four channels to represent color. The color component is Cyan, Magenta, Yellow, and Black. The four channels result in over 4 billion available colors. This mode is used by printers.


Multichannel
It contains 256 levels of gray in each channel. It is used for specialized printing. Multichannel mode support many file formats.


Bitmap
It uses a single channel that results in two shades of brightness that is black and white. This mode does not contain any intermediary gray levels. This mode is used for creating simple logos, line art, and special effect such as mezzotints.


Grayscale
It uses single 8-bit channels. This results in 256 brightness level ranging from 0 (for pure black) to 255 (for pure white)


Duotone
It uses a single 8-bit channel. This mode allows you to use two to four inks to print certain tones of the image in different colors. It is typically used to print tinted images with special ink requirements.


Indexed Color
It uses a single channel to represent color. The bit depth can be set from 1 to 8 bits. A color table is used to determine the available colors.


Lab Color
It uses three channels to represent color. This color mode defines colors mathematically and is not device specific. The color component are L- luminance component ranging from black to white, A – chromatic component ranging from green to red, B – chromatic component ranging from blue to yellow. 




Navigation Tools in Photoshop
One may find it necessary to have a closer look at an image to select or edit a part of it. Using Photoshop, you can save time zooming out or switching between documents without scrolling palettes. Photoshop offers tools, commands, keyboard shortcuts, and floating palette to view images easily. 

The Zoom Tool
The zoom tool allows you to vary the magnification of an image. The Zoom In tool is used to increase the magnification of the image, the Zoom Out tool also decreases the magnification of an image. You can zoom to a maximum over 3200 percent by using the tool. Moreover you can further improve the good quality of the zooming process by using the zoom tool options bar. The keyboard shortcut key of Zoom tool is (Z). While using the Zoom In tool, you can also hold on the Alt key to Zoom Out the entire image.

The Navigator Palette
Now let’s move onto the navigator palette further more. The Navigator palette allows you to find the right way to deal with complicated situation through a document by providing a number of options. The view box in this palette shows a very small detailed view of the entire image. This palette also provides a Zoom Slider that can be used to quickly choose a magnification level without selecting the Zoom tool while using different tool. You can even specify a particular magnification value using the magnification text box is red in a square shape; you can drag it to select a specific portion of entire image by dragging the magnification text box.


The very small detailed view of the document as displayed in the Navigator palette.




The New Dialog Box
The New dialog box contains options that allow you to set the Width and the Height of an image. It allows you to choose the Resolution and Color Mode for the image. You can also choose values from the Preset drop down list to automatically specify the dimensions and settings for the image. You can set the background contents to be White, Background Color or Transparent.

The settings of the Flower of the Day Film Banner file as displayed in the New dialog box

  



File Information Box
Once you create a new document, the status bar of the document window displays the file information box. The file information box allows you to view and check document sizes. In this box, the data on the left side represents the size of the document with one layer information. The data on the right side shows the size of the image as Photoshop saves it, with all the extra layers and channels affecting file size. 

Info Palette
The Info palette provides document status information. It also displays information related to the current selected tool. The color values for the current mode appear on the left side of the Info palette, and CMYK values appear to the right.

 
The very small detailed view of the Info palette.