java qr code app The saturation component is ignored in all versions of Image::Magick before 5.2.4. in Java

Painting QR Code in Java The saturation component is ignored in all versions of Image::Magick before 5.2.4.

The saturation component is ignored in all versions of Image::Magick before 5.2.4.
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There is, of course, nothing stopping you from using both Image::Magick and GD to combine images. You can easily read an image in with one module, do some work on it, and then transport it to the other module for further manipulation or drawing. See section 4.3, Combining GD and Image::Magick, on page 53 for methods to do this. 8.2.3
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Adding a watermark to an image
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Adding a watermark to an image can be accomplished in two ways: visibly and invisibly. Adding a visible watermark is normally done to assert ownership of the copyright on an image in a clear way, and when compromising the visual integrity of the image does not present a problem.
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To add a visual watermark to an image, you can overlay your company logo or some text onto the image. The GD copyMerge() method (see page 140) provides a good way to overlay an image which is mostly transparent onto another image. We will discuss how a small program takes a logo file and an image file, and produces an image with the logo overlaid. The program starts as follows:
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#!/usr/local/bin/perl -w use strict; use GD; use Getopt::Long; sub usage { <<EOF; Usage : $0 [options] logo image output_file Options: --opacity N specify opacity of logo in percent. --gravity SPEC specify where the logo should end up. One of North, NorthEast, NorthWest, South, SouthEast, SouthWest, East, West, or Center. EOF } my $gravity = 'SouthEast'; my $opacity = 50; GetOptions( 'gravity=s' 'opacity=i' ) or die usage();
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Set some defaults
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=> \$gravity, => \$opacity,
die usage() unless @ARGV >= 3;
As the usage() subroutine specifies, this program takes the name of an input logo file, the name of the image on which to overlay the logo, and the name of an output file. It pastes the logo on top of the image, using the opacity and gravity specified. COMBINING IMAGES 145
my $watermark_file my $image_file my $out_file
= shift; = shift; = shift;
my $image = GD::Image->new($image_file) or die "GD cannot read $image_file: ", $! "$!\n" : "unknown error\n"; my $watermark = GD::Image->new($watermark_file) or die "GD cannot read $watermark_file: ", $! "$!\n" : "unknown error\n"; my ($x, $y) = calculate_coords($gravity, $image, $watermark); $image->copyMerge($watermark, $x, $y, 0, 0, $watermark->getBounds(), $opacity); open(IM, ">$out_file") or die "$out_file: $!"; binmode(IM); print IM $image->png; close(IM);
Read the input images
Calculate destination coordinates of watermark
Merge the two images Save the resulting image
This program uses the internals of GD to autodetect the image format3 instead of opening the files itself, which makes it necessary to distinguish between two cases of errors that might cause GD::Image->new() to fail: the errors that set the $! variable, and those that don t. If $! is not set when an error occurs, the string unknown error is appended to the error message. While this is hardly enlightening, it is slightly more elegant than having no error message at all. The coordinates where the watermark image should be placed are determined with a call to calculate_coords(), which is covered later. For this simple program, the logo is always copied as a whole onto the image. This is accomplished by using the call to $watermark->getBounds() to specify the width and height of the rectangle to copy. For a program such as this it is hardly useful to allow these parameters to specify anything other than the whole logo, so we don t provide any command-line switches for them.
sub calculate_coords { my ($grav, $dst, $src) = @_; my ($dst_width, $dst_height) = $dst->getBounds(); my ($src_width, $src_height) = $src->getBounds(); my $x = ($dst_width - $src_width )/2; my $y = ($dst_height - $src_height)/2;
Default to Center
for ($grav) { /^North/i and $y = 0; /^South/i and $y = $dst_height - $src_height;
Using the GD::Image::new() method to autodetect the image format requires GD version 1.30 or newer.
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/West$/i /East$/i
and $x = 0; and $x = $dst_width - $src_width;
} return ($x, $y); }
The destination coordinates $x and $y are calculated from the gravity specification by the calculate_coords() subroutine. The gravity specification has been deliberately chosen to match that of Image::Magick, which makes it easier to replace GD with Image::Magick, should the need arise, and it provides us with a fairly consistent interface. There are no explicit checks in place to verify that the gravity specification is a valid one, since all invalid specifications will cause the logo to be centered on the output image. The result of this program can be seen in figure 8.2.
Figure 8.2 Watermarks added to an image by overlaying a logo using GD and Image::Magick. Both images were generated with the opacity set to 60 percent, and all other command line parameters left at the default value.
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