The new features of Photoshop CS5 are aimed at the enthusiasts and professionals who have been using the tool for several years and have a familiarity with the core workflow. If you are completely new to Photoshop, look for the tutorials in the books and magazines available at the time of your purchase. You can get a lot of information from online communities and blogs. Although those are great resources, it’s hard to find Photoshop tutorials from true experts. Instead, look for tutorials from magazine authors who have a wide variety of experience in the industry. Although those are not the best resources, they are still better than learning from novices who have a lot of opinions.
As you read about Photoshop in this chapter, you find out how to use the software to create and edit images. You find out how to export a finished image or manipulate one using some of the tools.
Selecting an Image
Your first job when you start up Photoshop is to select a good image to work on. Photoshop CS5 adds quite a few more ways to select an image, and it includes a wizard to help you find one.
If you have a decent image on your computer, you can use the Windows Photo Viewer, Windows Explorer, or a file manager that organizes your files by name to select an image.
Using the built-in Help system, the Select file command and the Select menu on the menu bar at the top of the screen, or the Image Picker button on the main toolbar, you can quickly find an image to open to work on. Figure 1-1 shows an example.
**Figure 1-1:** Use the Windows Photo Viewer, Windows Explorer, or a file manager to select the file you want to work on.
When you’ve selected the image, you can start the work of editing your image. If the image is in a collection folder or on a folder on your computer, you can click its name in Windows Explorer or in a file manager to open it for editing.
If you have multiple image files open, you can use the Image Picker button to select a new file to open. The Image Picker opens and closes when you click the button. You can even move the image to the Favorites files that are automatically selected in Windows Explorer.
If you’ve selected an image in Windows Explorer, you can open it in Photoshop with a single click. Because most image files are files within a folder or collection folder, you have a lot of
The following points explain how to edit and create graphic design in Adobe Photoshop Elements.
1. Using Elements, you can easily perform various editing and creating effects.
The world’s biggest photograph editing software Photoshop have made tools that allow you to create photo effects and manage your workspace easily.
But if you wish to create your own special effects, you need to use Photoshop Elements.
Elements is the simplest version of Photoshop and it contains basic functions which you can use to create your own special effects.
If you have the software and you have time, you can use Photoshop Elements and create your own effects and stickers.
If you don’t have the software or you don’t have time, you can also use the free online editor.
Note: Online Photoshop Elements is not as powerful as the desktop version.
2. Start Photoshop Elements.
Start Photoshop Elements and open the file.
3. Select the Image option.
Click on the image and click on the rectangle that appears.
The image you have selected is displayed in the image area. You can also click the “+” on the image border to add a new photo to the image.
4. Adjust the size of the photo.
You can adjust the size of the image by clicking on the rectangle. You can also enter an amount.
5. Select the image or paste in a different photo.
After selecting the image, click in the empty space on the photo or paste in the photo.
Click on the rectangle button in the corner and click on the trash can on the top-right corner to delete the photo.
6. Create a new photo.
You can create a new photo by clicking on the rectangle. You can also draw a photo in the canvas.
To create a new photo, first select the canvas. Then, using the ruler, draw a rectangle in the canvas.
7. Create a new rectangular photo.
Using the rectangle in the canvas, select the rectangle and click on the circle in the top-right corner.
You will create a new photo inside the canvas. Then click on the image to display it. You can change the size of the photo by clicking on the gray box. You can also use the tools that appear in the menu on the right to resize the photo.
8. Filters and special effects.
Pen is a common tool in Photoshop. It allows you to create vector-based shapes and lines, which are not limited to just drawing lines, as the name implies. You can fill your path with color or create circles, squares, triangles or other shapes.
The Gradient tool is used to draw a linear transition from one color to another. Its easiest to use to set a gradient for an entire image.
The Eraser tool is similar to the Paint Bucket tool in Illustrator. You can fill your selection with a different color to remove all pixels and fill your selection with the original color.
The Move tool is similar to the Selection tool in Illustrator, and is very useful for stretching and cropping your image.
The Hand tool is useful for drawing. You can draw directly on a copy of your current document, or zoom in and out using Zoom Tool.
The Move Tool allows you to move your image or any layer from one location to another, and resize it proportionally. You can also move objects in your layers without the need to select them.
The Eyedropper Tool allows you to sample an area of an image and copy the color into your Toolbox palette. You can also sample from a color wheel or a gradient.
The History palette is used for organizing your changes. You can see all of the edits you have made to a file or document, and undo them.
The History palette is a useful tool for organizing your work. You can see all of your changes made to a file or document, and undo them.
The Selection Tool is very useful for making complex selections from shapes. You can also use the Selection tool to fill an area with a color or size-based paint bucket.
The Gradient and Eraser tools create linear transitions and gradients and can be useful for editing and repairing damage to images.
The Clone Stamp tool is similar to the Clone Tool in the Paint Bucket tool and allows you to copy color from one area of an image and paste it into another.
The Paint Bucket tool is similar to the Clone Stamp, and allows you to fill your selection with a different color.
The Spot Healing Brush Tool is a very useful tool for removing unwanted objects from your images.
The Rectangular Marquee Tool allows you to draw a box around a rectangular section of your image. You can then use the Rectangular Selection tool to select just that area and crop it.
In the Layers palette you can change the order of layers, move, copy and
How does a multiprocessing.Pool work?
I was wondering if someone could point out to me some simple examples showing how the Python multiprocessing.Pool class works. All the examples I found online were a bit too complex to be easily understood. For example, I was looking for an explanation of how to use Pool with a really big array, and I found this:
>>> # Create a big list with a long delay
>>> import time
>>> l = [i for i in range(1000000)]
>>> # Turn that list in an array and use that for a Pool
>>> x = np.array(l)
>>> from multiprocessing import Pool
>>> p = Pool(2)
>>> x = p.map(square, *l.count)
>>> # Wait until the job is done
I also think that there is something interesting about the map function in the example above. However, I can’t wrap my head around it. Could someone please explain it to me with the simplest example possible?
From the docs:
The map() function executes a function of arguments over an array,
returning an array results:
It takes the function to call, the argument to pass to that function, and the array to apply the function to.
Because it returns an array, it returns multiple results; even when the results don’t have the same shape as the input.
func : function
Function to be applied to args.
args : sequence
Sequence of positional arguments to apply to func.
kwargs : sequence
Sequence of keyword arguments to pass to func.
pool : concurrent.futures.ThreadPoolExecutor
An executor that runs the functions in a thread pool.
chunksize : int or None
How many slices to return in result array. If None, the size
will be the same as the input array.
When using more than one core, this is the
Processor: 2.6 GHz dual-core Intel Core i3, Intel Core i5 or AMD Athlon II X2 or better
Memory: 4 GB RAM (8 GB recommended)
Graphics: 1 GB NVIDIA® GeForce GTX 470 / ATI Radeon HD 5770 or better
Video: DirectX® 11 compatible video card with 1280×720 resolution
Storage: 500 MB available space
Additional Notes: Displaying image in maximum size of image is recommended.
Move/Rotate: use keyboard: Arrow keys (Q
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