barcode dll for vb net 10: Putting Pictures on the Screen in Software

Creating Code 128 in Software 10: Putting Pictures on the Screen

CHAPTER 10: Putting Pictures on the Screen
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ADJUST THE PIXEL COUNT (RESAMPLE A PHOTO)
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In most photo editors, you can change the pixel dimensions of an image in the same dialog box where you set print size and output resolution. The difference between the two procedures is that for screen prep, you need to turn on the resampling function, which enables you to add or delete pixels. These steps detail the process in Photoshop Elements. The approach is the same in any program, but the specific menu commands and control names may vary.
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1. Save a copy of your image and use the copy for your screen photo. That way, you can always access all the original image pixels later if needed. 2. Choose Image | Resize | Image Size to open the Image Size dialog box. 3. Select the Resample Image option, as shown in Figure 10.4. When this option is active, the Width and Height boxes in the Pixel Dimensions section at the top of the dialog box become available.
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FIGURE 10.4 After turning on the Resample Image option, you can delete pixels as needed to adjust screen display size.
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4. Select Bicubic from the drop-down list next to the Resample Image check box. This option determines the algorithm the program uses to rebuild the photo at the new pixel dimensions. Bicubic produces the best results. 5. Select the Constrain Proportions check box to preserve the picture s original width-to-height ratio.
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ADJUST THE PIXEL COUNT (RESAMPLE A PHOTO) (continued)
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6. Enter the new pixel dimensions into the top set of Width and Height boxes. In the figure, I set the pixel dimensions to 300 200. (Note that in Photoshop Elements, the file size value shown at the top of the dialog box is not the actual file size, but the amount of memory the program needs to work with the photo while it s open. Other programs may treat this issue differently.)
7. Click OK to resample the image and close the dialog box.
To see your photo at the size at which it will display on-screen, choose View | Actual Pixels. Remember that the display size will differ on a monitor that s not running at the same screen resolution as yours.
Tracing the Origins of the 96/72 ppi Myth
Like any good myth, the one that suggests that you prepare a picture for the screen by setting the output resolution to 96 or 72 ppi has some basis in fact. In the early years of computers, monitors came in few sizes and offered only one or two screen resolution settings. Most new PCs shipped from the factory set to a screen resolution that resulted in 96 screen pixels per viewable inch of the screen. Macintosh systems used a default setting that translated to 72 screen pixels per viewable inch. Because these standards existed, you could set your image size in the same way you did for print output. If you wanted the picture to have a display size of 2 inches square, you set the print width and height values to 2 inches. Then you turned on your photo editor s resampling option and specified an output resolution of 96 or 72 ppi, depending on whether you were going for a PC audience or a Macintosh audience. The program eliminated or added pixels as necessary to give you that 96 or 72 ppi resolution. Although the result was indeed a screen image that was 2 inches square, the display size didn t have anything to do with the output resolution or print width and height values that you set. As explained earlier in the chapter, display devices simply light up one screen pixel for each pixel in the image. Resampling the image to 96 or 72 just gave you the right number of pixels to fill a 2-inch square area on a monitor that itself was producing 96 or 72 screen pixels per viewable inch of the screen.
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