There's a need to transform .svg files and save em either in .svg or jpeg format. The problems with ImageMagick is that it saves transformed files on white background and I deadly need it on transparent.
Any suggestions with other tools or clear php? Would really appreciate it.
The right ImageMagick command should be:
convert -background none somefile.svg somefile.png
You should use PNG or GIF as file format, because JPEG doesn't support transparency.
To use it in PHP:
<?php
$svg_file_name = "somefile.svg";
$png_file_name = "somefile.png;
system("convert -background none $svg_file_name $png_file_name");
?>
I doubt you can transform SVG files easily from within php. SVG files are basically XML files, and the standard is public, so anyone can make a converter...
I'd go for the external tool, it's easier and faster than processing from within a scripted language, and a lot safer when the author of the script dosen't actually know how to find out the command line switches for an application, and that JPEG files does not support transparency:)
go for convert -background none somefile.svg somefile.png as Jens said...
You can't do transparency with JPEG, but here's how to save an SVG as a PNG with a transparent background...
$image = new Imagick();
$image->setBackgroundColor(new ImagickPixel('transparent'));
$image->readImage('somefile.svg');
// ... do any image manipulation you need to here ...
$image->setImageFormat('png32');
$image->writeImage('somefile.png');
Related
I'm trying to write a PHP function to convert an SVG image without any antialiasing (so that the final PNG is blocky and contains only the colours specified in the SVG).
The command line equivalent is:
convert +antialias /path/to.svg /path/to.png
I'm assuming that I need to use PHP's Imagick::setOption method to pass in "+antialias", but the documentation is very sparse.
The following snippet will write a PNG file, but none of the options prevents antialiased pixels being rendered:
$image = new Imagick();
// None of these have any affect - output image is always antialiased.
$image->setOption('+antialias', true);
$image->setOption('-antialias', true);
$image->setOption('+antialias', 'true');
$image->setOption('-antialias', 'true');
$image->setOption('antialias', true);
$image->setOption('antialias', false);
$image->setOption('antialias', 'true');
$image->setOption('antialias', 'false');
$image->readImage('/path/to.svg');
$image->writeImage('/path/to.png');
Any help would be great, thanks.
That is not a good way to anti-alias a vector file such as SVG. The proper way in command line would be to set the desired density before reading the file and then resize back to compensate for a large magnification when using a large density. So for example
convert -density 288 image.svg -resize 25% image.png
Nominal density (default) is 72. So 288 = 72*4. Thus we resize afterwards by 1/4 = 25%, unless you want a larger output. Then resize by a larger value.
In PHP Imagick, you can create a new Imagick() instance. Then set the desired density. Then read the input SVG. Then resize. Then set the PNG format and save to disk. See setImageResolution for setting the density in Imagick. See https://www.php.net/manual/en/imagick.setimageresolution.php
I don't think what you want is possible, unfortunately. ImageMagick shells out to Inkscape to render SVGs, and Inkscape has no command-line option to disable antialiasing.
https://graphicdesign.stackexchange.com/questions/138075/export-svg-without-anti-aliasing-in-inkscape-1-0-by-command-line
You could render at high resolution and then do nearest-neighbour downsampling. It would reduce the visible antialiasing, but you would still get some colours not in the SVG file.
I am trying to convert a vector image formats .emf,.wmf to a high resolution sharp and crisp raster image .gif,jpg. (Usually this could be easily done in Illustrator). But i am unable to do this in PHP. I am trying the following code but the results are either blurry or distorted or even totally black.
<?php
$image = new Imagick("1.emf");
$image->resizeImage(1500,0,Imagick::FILTER_LANCZOS,1);
$image->setImageFormat('gif');
$image->setresolution(900, 900);
$image->writeImage("2.gif");
?>
We just needed to set the resolution before loading the image.
$image = new Imagick();
$image->setresolution(300, 300);
$image->readimage($filename);
$image->resizeImage(1500,0,Imagick::FILTER_LANCZOS,1);
$image->setImageFormat('jpg');
$image->writeImage("1.jpg");
This code will convert a vector to a sharp and crisp raster image. It works for all vector formats (svg, ai, emf, wmf, etc). If the jpg result is unexpectedly a black image, you need to change the image transparency to white (check this link). Another way to get around with transparency problem is by getting your PHP updated to 5.5 and by installing Imagick for that version. By doing so, it will not cause any problems with transparent images and the above code will just work fine.
For testing purposes you could change jpg to png because it supports transparency.
I am trying to add round corners to a jpeg file, but the problem is that after adding round corners, I am getting a black background color. Somehow I am not able to change it to any other color (white, transparent, red). It just simply shows black background where the image has rounded corners.
The code that I am using is:
<?php
$image = new Imagick('example.jpg');
$image->setBackgroundColor("red");
$image->setImageFormat("jpg");
$image->roundCorners(575,575);
$image->writeImage("rounded.jpg");
header('Content-type: image/jpeg');
echo $image;
?>
I cannot use png as the jpeg files are huge, about 5 MB, so if I used png, the file size would go up to 26 MB, even though the png adds transparent round corners.
Also the IMagick version that i am using is:
ImageMagick 6.6.2-10 2010-06-29 Q16 http://www.imagemagick.org
Also the output(image generated) will get printed so I don't know if css will work over here.
Sorry, I am trying to actually create a new jpeg file with rounded corners from an already existing jpeg file that doesn't have round corners this is actually a photograph taken from a camera, so there are multiple/too many colors so I can't use gif as well.
Also my site will only just generate the round corner image then afterwards it will get downloaded using a FTP program by the admin of the site and then using a system software will get printed, so in short my website will not be printing the image but rather just generate it
Try this:
<?php
$input = 'example.jpg';
$size = getimagesize($input);
$background = new Imagick();
$background->newImage($size[0], $size[1], new ImagickPixel('red'));
$image = new Imagick($input);
$image->setImageFormat("png");
$image->roundCorners(575,575);
$image->compositeImage($background, imagick::COMPOSITE_DSTATOP, 0, 0);
$image->writeImage("rounded.jpg");
?>
I may get downvoted, but I say let css deal with the corners and take some load off of your server :)
CSS rounded corners.
JPG doesn't have a transparent color(s) (alpha channels) in its palette.
The output image must use either PNG or GIF (or another image format that supports alpha channels).
setImageBackgroundColor is another option if you want an opaque background.
EDIT
Your comment reminds me that you could try to use the command line; shell_exec() will run a command line argument from PHP. The command in the ImageMagick API you'll need to start with is convert example.jpg, and then you can pass flags with the various parameters you want.
Since ImageMagick is already installed, it will work right away. You may need to point your system PATH to the ImageMagick directory where all of the executables are.
There's plenty of questions and forums dedicated to rounded corners with this method so I'll leave that up to you.
Here's a helpful tip though - there is a silly confusion with the convert command, since Windows also has a convert.exe that is rarely used, but will confuse your command line, so make sure you're calling the right convert. ;) To test if it's working, try convert example.jpg example.gif (which should convert your example to a gif).
To get output from your command line, finish all commands with 2>&1 which will pipe cmd output back into PHP.
I have a PHP application which needs to deal with incoming TIFF files. I have neither control nor knowledge over the colorspaces of this TIFFs and the application should store all incoming images as RGB JPEGs.
Problem is, incoming TIFF files are anything: CMYK, RGB, some sort of YCbCr wrapped in sRGB, and so on, and I need to convert them somehow to RGB JPEGs before saving.
I need some sort of a conversion function in PHP which uses IMagick extension which can get any binary TIFF data and convert it to proper RGB JPEG binary data. It needs to handle different colorspaces inside TIFF images correctly. Output format (RGB JPEG) stays the same for any input file.
The following obvious solution converts some CMYK TIFFs correctly, some CMYK TIFFs get inverted colors and YCbCr RGB TIFFs get totally corrupted by red overlay:
$converter = new IMagick();
$converter->setResourceLimit(6, 1);
$converter->readImageBlob($data);
if ($converter->getImageColorspace() != IMagick::COLORSPACE_RGB
&& $converter->getImageColorspace() != IMagick::COLORSPACE_GRAY
) {
$icc_rgb = file_get_contents('sRGB_v4_ICC_preference.icc');
$converter->profileImage('icc', $icc_rgb);
$converter->setImageColorspace(IMagick::COLORSPACE_RGB);
}
$converter->setImageFormat('jpeg');
$converter->setImageCompression(Imagick::COMPRESSION_JPEG);
$converter->setImageCompressionQuality(60);
$converter->resizeImage(1000, 1000, IMagick::FILTER_LANCZOS, 1, true);
$converter->stripImage();
$result = $converter->getImagesBlob();
This solution is taken from there: http://blog.rodneyrehm.de/archives/4-CMYK-Images-And-Browsers-And-ImageMagick.html Obviously, it doesn't work for all colorspaces, because it doesn't detect them reliably. As you can see, it even uses the sRGB_v4 ICC color profile downloaded from it's homepage.
Google finds me one particular solution to the red overlay problem (just one of the conversion screw-ups), but it's only for console and when you know beforehand that you deal with YCbCr images:
convert some.tif -set colorspace YCbCr -colorspace RGB some.jpg
I can live with passthru-ing convert and pass to convert all the magical switches needed, but I suppose I need to detect the source image's colorspace beforehand and call a identify | grep before every convert in an otherwise PHP application is an overkill.
I've experienced this same issue.
It also came up in the imagick forums and the correction was pushed into ImageMagick 6.8.0-4 .
So upgrading should solve this issue. I've upgraded to ImageMagick 6.8.1-9 and haven't encountered this since.
How do I efficiently compress a PNG? In my case, the images are small grayscale images with transparency.
Currently I'm playing with this:
// ...
$im->setImageFormat('png');
$im->setImageColorspace(\Imagick::COLORSPACE_GRAY);
$im->setImageCompression(\Imagick::COMPRESSION_LZW);
$im->setImageCompressionQuality(9);
$im->stripImage();
$im->writeImage($url_t);
As Imagick doesn't offer COMPRESSION_PNG, I've tried LZW but there's almost no change in the filesize (usually it's even bigger than before).
If I open the image in GIMP and simply save it, the filesize gets drastically reduced (e.g. 11,341 B --> 3,763 B or 11,057 B --> 3,538).
What is the correct way of saving a compressed PNG with Imagick?
Have a look at the first part of this answer:
Convert multipage PDF to PNG and back (Linux)
It explains the meaning + syntax of ImageMagick's -quality setting for PNGs.
I'm definitely not sure if it is correct way to save PNG, but my way is:
$im->setImageCompression(\Imagick::COMPRESSION_UNDEFINED);
$im->setImageCompressionQuality(0);
This gives me perfect quality of the image and file size very similar to PS6 saved 'Save for Web'. Sometimes even smaller sizes!