We recently installed the latest version of ImageMagick onto our Linux server. I seem to be having issues performing the most basic of tasks.
I am running this command line:
/usr/bin/convert /location/to/source/design.ai /location/to/save/output.jpg
Unfortunatly is saves design.jpg as an illustrator file (if I rename the file to output.ai it opens). Even if I do this:
/usr/bin/convert /location/to/source/design.ai -rotate 90 /location/to/save/design.jpg
It rotates the file and saves again as an illustrator document. This happens with all filetypes (e.g. png, bmp, etc...)
It appears ImageMagick cannot figure out what I want it converted to and just saves as the same file type.
Any ideas on fixing this?
Regards:
John
(Yes, McKay is properly right. This question would be better placed at serverfault.)
But I have an idea. By doing 'convert' only one gets a hint at the bottom:
To specify a particular image format, precede the filename
with an image format name and a colon (i.e. ps:image) or specify the
image type as the filename suffix (i.e. image.ps).
Perhaps convert gets confused by the path given.
So you could try this:
convert /location/to/source/design.ai output.jpg
or
convert /location/to/source/design.ai jpg:/location/to/save/output.jpg
Regards
Sigersted
Related
I'm trying now to convert a PDF file to JPG, using ImageMagick with PHP and CakePHP. The PDF is in perfect shape and it's right the way it should be, but the image generated from the PDF is always overflowing the borders of the file.
Until now, I've tried tweaking the code for the generation with no sucess, reading a lot from the PHP docs (http://php.net/manual/pt_BR/book.imagick.php).
Here are the convertion code:
$image = new Imagick();
$image->setResolution(300,300);
$image->setBackgroundColor('white');
$image->readImage($workfile);
$image->setGravity(Imagick::GRAVITY_CENTER);
$image->setOption('pdf:fit-to-page',true);
$image->setImageFormat('jpeg');
$image->setImageCompression(imagick::COMPRESSION_JPEG);
$image->setImageCompressionQuality(60);
$image->scaleImage(1200,1200, true);
$image->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
$image->setImageAlphaChannel(Imagick::ALPHACHANNEL_REMOVE);
$image->writeImage(WWW_ROOT . 'files' . DS . 'Snapshots' . DS . $filename);
Here are the results:
https://imgur.com/a/ISBmDMv
The first image is the PDF before the conversion and the second one, the image generated from the PDF where the right side text overflows.
So, why this is happening? And if someone got some alternative for any tech used (the GhostScript, ImageMagick, etc) is also welcome!
Thanks everyone!
Its very hard to say why you see the result you do, without seeing the original PDF file, rather than a picture of it.
The most likely explanation is that your original PDF file uses a font, but does not embed that font in the PDF. When Ghostscript comes to render it to an image it must then substitute 'something' in place of the missing font. If the metrics (eg spacing) of the substituted font do not match precisely the metrics of the missing font, then the rendered text will be misplaced/incorrectly sized. Of course since its not using the same font it also won't match the shapes of the characters either.
This can result in several different kinds of problems, but what you show is pretty typical of one such class of problem. Although you haven't mentioned it, I can also see several places in the document where text overwrites as well, which is another symptom of exactly the same problem.
If this is the case then the Ghostscript back channel transcript will have told you that it was unable to find a font and is substituting a named font for the missing one. I can't tell you if Imagemagick stores that anywhere, my guess would be it doesn't. However you can copy the command line from the ImagMagick profile.xml file and then use that to run Ghostscript yourself, and then you will be able to see if that's what is happening.
If this is what is happening then you must either;
Create your PDF file with the fonts embedded (this is good practice anyway)
Supply Ghostscript with a copy of the missing font as a substitute
Live with the text as it is
I am trying to convert an image with ImageMagick. I am cropping and resampling to 112 DPI:
convert myimg.jpg -crop 1024x683+0+0 -resize 100% -resample 112 downsample.jpg
A script runs through many images of varying DPI and downsamples them.
However, a particular file has gummed up the script. Somehow, the file has a DPI of 1 (?!?) So it ends up trying to sample it up to 112 from 1, and the attempt eats up all my RAM and hangs the script.
identify -verbose myimage.jpg
Image: myimage.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 1024x683+0+0
Resolution: 1x1
Print size: 1024x683
Is there an argument/flag I can use with ImageMagick to prevent this from happening, maybe something that tells it to only downsample?
Could your error be related to...
For formats which do not support an image resolution, the original resolution of the image must be specified via -density on the command line prior to specifying the resample resolution.
JPEG I know supports resolution but maybe its wrong in the EXIF header or somehow ambiguous / confused with embedded thumbnail (again, maybe the unit is assumed). I'd look more closely at the [-density] argument (http://www.imagemagick.org/script/command-line-options.php#density) and how it relates to resolution and density on certain formats.
As for getting your script working. Seems you might want to break the operations out into more individual actions? If you can't satisfy the convert with using -density I would look at testing for the case you know fails and just skipping. Could parse the results of identify or just the failure of the convert. You are executing these in shell calls from PHP yes?
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 am generating PNG file with cairo extension of PHP. The image contains a background and a text. Now I want to compress these images by PHP after its generated by cairo. Is there any library to do this?
I found pngcrush tool. But its a command line tool. I dont want to invoke system call. If there is not PHP solution a C solution would do. In that case I'll make a PHP extension.
I have read this related question. But there is no answer in it.
You can use imagepng() ...
//If you don't already have a handle to the image and it's just on the file system...
$im = imagecreatefrompng("yourGenerateFile.png");
$quality = 5; //0 - 9 (0= no compression, 9 = high compression)
imagepng($im, 'file/to/save.png', $quality); //leave out filename if you want it to output to the buffer
imagedestroy($im);
I would take a look at PngOptimizer. You can get the source for it at the bottom of the page, and it has a separated CLI version too.
Only problem is that source is C++ , not ANSI C. I have never made a PHP extension, so i don't know if it makes a difference.
For C code take a look at ImageMagick. It looks like there is a PHP extension too.
I need to convert single Powerpoint (PPT) slides/files to JPG or PNG format on linux but haven't found any way of doing so successfully so far. I have heard that it can be done with open office via php but haven't found any examples or much useful documentation. I'd consider doing it with python or java also, but I'm unsure which route to take.
I understand that it can be done using COM on a Windows server but would really like to refrain from doing so if possible.
Any ideas/pointers gratefully received. (And yes, I have searched the site and others before posting!)
Thanks in advance,
Rob Ganly
Quick answer (2 steps):
## First converts your presentation to PDF
unoconv -f pdf presentation.ppt
## Then convert your PDF to jpg
convert presentation.pdf presentation_%03d.jpg
And voilá.
Explaning a little more:
I had already follow in the same need. Convert a powerpoint set of slides into a set of images. I haven't found one tool to exactly this. But I have found unoconv which converts libreoffice formats to other formats, including jpg, png and PDF. The only drawback is that unoconv only converts one slide to a jpg/png file, but when converting to PDF it converts the whole presentation to a multiple page PDF file. So the answare were convert the PPT to PDF and with imagemagick's convert, convert the multiple page PDF to a set of images.
Unoconv is distributed within Ubuntu distribution
apt-get install unoconv
And convert is distributed with the imagemagick package
apt-get install imagemagick
In my blog there is an entry about this
This can be done from PHP using a 3d party library (Aspose.Slides). It will work on both .ppt and .pptx, and it's lightning fast.
Here is the relevant piece of code in PHP:
$runtime->RegisterAssemblyFromFile("libraries/_bin/aspose/Aspose.Slides.dll", "Aspose.Slides");
$runtime->RegisterAssemblyFromFullQualifiedName("System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", "System.Drawing");
$sourcefile = "D:\\MYPRESENTATION.ppt";
$presentation = $runtime->TypeFromName("Aspose.Slides.Presentation")->Instantiate($sourcefile);
$format = $runtime->TypeFromName("System.Drawing.Imaging.ImageFormat")->Png;
$x = 0;
/** #var \NetPhp\Core\NetProxyCollection */
$slides = $presentation->Slides->AsIterator();
foreach ($slides as $slide) {
$bitmap = $slide->GetThumbnail(1, 1);
$destinationfile ="d:\\output\\slide_{$x++}.png";
$bitmap->Save($destinationfile, $format);
}
$presentation->Dispose();
It does not use Office Interop (which is NOT recommended for server side automation) and is lightining fast.
You can control the output format, size and quality of the images. Indeed you get a .Net Bitmap object so you can do with it whatever you want.
The original post is here:
http://www.drupalonwindows.com/en/blog/powerpoint-presentation-images-php-drupal-example