Quality issue with converting a PNG to PDF with ImageMagick in PHP
Multi tool use
Quality issue with converting a PNG to PDF with ImageMagick in PHP
I have a PNG file with quite decent quality and not at all small size. I convert it to PDF like this(in php):
$imagick = new Imagick();
$imagick->readImageBlob($image);
$imagick->setImageFormat('pdf');
echo $imagick->getImageBlob();
And I get a PDF file with my image in it. But the quality gets very poor. I thought I might fix with trying different density setting it with setResolution method. But this lead to either the image becoming very small or getting even worse quality. What am I doing wrong?
setResolution
@fmw42 What I expect is simply a PDF wrapper file with a PNG image put inside as in a container. I expected it to be almost the same quality but instead I get a lot worse quality.
– Gherman
Jul 2 at 18:54
Please post links to your PNG and PDF images.
– fmw42
Jul 2 at 18:55
The
echo $image->getImageBlob(); will default to a resolution of 72. How are you implementing setResolution?– emcconville
Jul 2 at 20:57
echo $image->getImageBlob();
setResolution
@emcconville It's an implemented method in
Imagick and I believe it's like denisity under the hood. $image->setResolution(300, 300);– Gherman
Jul 2 at 21:18
Imagick
denisity
$image->setResolution(300, 300);
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Imagick uses Imagemagick which is not a vector processor. So when convert a raster to a vector, all that will happen is that the raster image will be imbedded in a vector shell. You cannot improve the quality from that of the original raster image. So there is really no point in converting it to PDF. If that does not explain it, then please post links to your PNG and PDF images.
– fmw42
Jul 2 at 18:13