barcode programming in c# Drawing by combining images in Java

Draw QR in Java Drawing by combining images

Drawing by combining images
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Another way to achieve the drawing we want is to create two images and combine them. In the code in the previous section, everything between the drawing of the polygon and the drawing of the red box can be replaced by the creation of a new image, on which the green O is drawn:
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my $im2 = Image::Magick->new(size => '400x300'); $im2->Read('xc:white'); $im2->Draw(primitive stroke fill points $im2->Draw(primitive stroke fill points => => => => => => => => 'circle', 'red', 'green1', '199,149 74,149'); 'ellipse', 'red', 'white', '199,149 50,100 0,360');
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O Create a new
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white image
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$im2->Transparent(color => 'white'); $im->Composite(image => $im2, compose => 'Over');
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O transparent
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O Combine with other image
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The output of this code can be seen in figure 4.6. It is very similar to figure 4.5, except that the outlines of the O are thinner, and more smooth. However, the combination of the two images has introduced some slight artifacts where the O overlaps the polygon and the rectangle. This is due to the fact that Image::Magick has antialiased the edge of the circle it drew against the background of the secondary image, which was white. The call to the Transparent() method makes all white pixels in 48
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DRAWING
the image transparent, but the determination of which pixels are white is, once again, subject to the fuzzy matching that Image::Magick employs. The artifacts that show up are the pixels that weren t considered to be white.
Figure 4.6 Creating a drawing with Image::Magick by overlaying several separate images which each represent part of the complete drawing.
The artifacts on the outside can be removed by starting with a transparent image, instead of a white one:
$im2->Read('xc:none');
This leaves the pixels on the inside of the O. Of course, we could simply increase the fuzziness of the matching algorithm before calling Transparent(). In this particular case that would probably work well, but it is not a universally workable solution. If we could fill the inner ellipse with a fully transparent color, there would be no artifacts; but unfortunately, setting the fill color to none or another color with full transparency (such as #000000ff ) doesn t help, and the transparency will be silently ignored.2 There is one other solution that combines images, and that is to create a transparency mask for the secondary image:
my $im2 = Image::Magick->new(size => '400x300'); $im2->Read('xc:white'); $im2->Draw(primitive => 'circle', stroke => 'red', fill => 'green1', points => '199,149 74,149'); $im2->Draw(primitive => 'ellipse', stroke => 'red', fill => 'white', points => '199,149 50,100 0,360'); my $mask = Image::Magick->new(size => '400x300'); $mask->Read('xc:white'); $mask->Draw(primitive => 'circle', stroke => 'black', fill => 'black',
It is anticipated that this will be fixed in a future release of Image::Magick
DRAWING WITH IMAGE::MAGICK
points $mask->Draw(primitive stroke fill points
=> => => => =>
'199,149 74,149'); 'ellipse', 'black', 'white', '199,149 50,100 0,360'); => => => => $mask, 'ReplaceMatte'); $im2, 'Over');
$im2->Composite(image compose $im ->Composite(image compose
Calls to Transparent() are eliminated because the transparency is created by the mask. The mask is created by repeating the drawing instructions on the new image, but with the colors set to either black or white, depending on what you want to be transparent and what opaque. A fully black pixel in the mask will result in an opaque pixel after the composition with the ReplaceMatte method, and a fully white pixel will result in a transparent pixel. More discussion on how image composition works in Image::Magick can be SEE ALSO found in section 8.2.2, Combining Image::Magick images, on page 142, more on transparency and alpha masks in section 12.4, Alpha channels and transparency, on page 229, and a description of the Draw() method and all its arguments in appendix A on page 257. While the result of this method is reasonably acceptable, it is a lot to deal with, and the code to create images like these often becomes quite verbose. Overlaying images can be a very useful tool (see for example sections 8.2, Combining Images, on page 140 and 12.4, Alpha channels and transparency, on page 229), but it does not entirely provide us with the desired outcome for this particular task. Let s have a look at another method to achieve the drawing we want. 4.2.4
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