qr code generator java 1.4 Figure 10.4 Isolation and knockout in Java

Drawer QR Code in Java Figure 10.4 Isolation and knockout

Figure 10.4 Isolation and knockout
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Overview of supported image types
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The code that draws the four figures is identical. All the circles have the same CMYK color: C, M, and Y are set to 0 and K to 0.15. Their opacity is 1.0 and the blend mode is Multiply; the only difference is the isolation and knockout modes.
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Isolation For the two upper squares, the group is isolated: it doesn t interact with the backdrop. For the two lower squares, the group is nonisolated: the group composites with the backdrop. Knockout For the squares at the left, knockout is set to true: the circles don t composite with each other. For the two on the right, it s set to false: they composite with each other.
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Listing 10.7 shows how the upper-right figure was drawn. The other figures are created by changing the boolean values for the methods setIsolated() and setKnockout().
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Listing 10.7 Transparency2.java
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tp = cb.createTemplate(200, 200); pictureCircles(0, 0, tp); group = new PdfTransparencyGroup(); group.setIsolated(true); group.setKnockout(true); tp.setGroup(group); cb.addTemplate(tp, gap, 500);
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Note that figure 10.3 was inspired by figure L.16 in ISO-32000-1. Figure 10.4 is very similar to figure L.17. You may also want to take a look at the overview of the different blend modes in figures L.18 (RGB) and L.19 (CMYK). The blend modes are listed in section 11.3.5 of ISO-32000-1. They are all supported in iText (see the constant values starting with BM_ in the PdfGState class), but it would lead us too far off topic to discuss them in detail. It would be interesting to apply transparency to images, but before you can do so, you need to know which types of images are supported in iText.
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10.2 Overview of supported image types
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When we needed images in the previous chapters, we used Image.getInstance(), passing the path to an image without considering which type of image we were using. Figure 10.5 shows a document with 12 images. The first nine images were created with the getInstance() method; the last three are special cases. Let s start with the standard types.
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Different image types
10.2.1 JPEG, JPEG2000, GIF, PNG, BMP, WMF, TIFF, and JBIG2
Table 10.1 lists the types of images supported by the Image class and indicates which format is best to use in which context. For example, JPEG is a better format for photographs than GIF. GIF is better for charts than JPG.
Table 10.1 Type JPEG JPG Standard image types supported by com.itextpdf.text.Image Extension .jpg Description JPEG (Joint Photographic Experts Group) is commonly used to refer to a lossy compression technique, reducing the size of a graphic file by as much as 96 percent. Usually this is the best file format for photographs on the web. The successor to JPEG, providing better efficiency in compression. JPEG 2000 has multiple versions for use, including a lossless version and a tiling version that allows for zooming in to detailed areas of the image file. GIF (Graphics Interchange Format) is a format that is suitable for images containing large areas of the same color. GIF files of simple images are often smaller than the same files would be if stored in JPEG format, but GIF doesn t store photographic images as well as JPEG. A GIF file can contain multiple frames, in which case it s referred to as an animated GIF.
JPEG 2000
.jp2 .j2k
.gif
Overview of supported image types
Table 10.1 Type PNG Standard image types supported by com.itextpdf.text.Image (continued) Extension .png Description
The PNG (Portable Network Graphics) format was designed as the successor to GIF. It features compression, transparency, and progressive loading, like GIF. BMP (Windows bitmap) is a common form of bitmap file in Microsoft Windows. Most BMP files have a relatively large file size due to the lack of any compression. WMF (Windows Metafile) is a vector graphics format for Windows-compatible computers, used mostly for word processing clip art. TIFF (Tagged Image File Format) is commonly used for digital scanned images. It was originally a binary image format with only two possible values for each pixel. Nowadays, it s a popular format for high color-depth images, along with JPEG and PNG. A TIFF image can consist of multiple pages. JBIG2 (Joint Bi-level Image Experts Group) is an image compression standard for bilevel images. Bi-level images are digital images in which each pixel is represented by only one bit. For instance, a pixel can be either black or white. JBIG2 is intended for images sent using a fax. A JBIG2 image can consist of multiple pages.
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