i want to display images like facebook find friends page. i dont want to crop an image. want to reduce size of image.and maintains its actuall appereance.how i can do this.
I recommend the IMagick extension for PHP since it's light on resources and easy to use. The GD extension comes bundled with PHP, but is harder to use and uses a lot of memory.
Here's an example for IMagick:
<?php
header('Content-type: image/jpeg');
$image = new Imagick('image.jpg');
$image->thumbnailImage(100, 100, true);
echo $image;
?>
i dont want to crop an image. want to reduce size of image.and maintains its actuall appereance.
If the actual image size is 128*128 pixel you can use
<img src="..." height="64px" />
"actuall appereance." i think you are talking bout ratio ?
Related
I am getting Image URL from the DB like this "image01-v2-70-70.jpg".
It is already scaled to 70-70, so I am getting it as smaller image.
I want to scale this image to 120-120 from its default 70-70
Thanks in Advance
You can do this with the help of a php extension php image magick
header('Content-type: image/jpeg');
$image = new Imagick('image01-v2-70-70.jpg');
$image->adaptiveResizeImage(120,120);
echo $image;
But this is highly not recomended as you are going from a smaller resolution to a larger resolution which will make the image blurry.
A piece of advice try to make a copy 120X120 resolution from the original image
I am making an avatar script from scratch and am having some problems. I got transparency working, and multi-image support for heads, bodies, shirts, etc.
Anyhow, I want to be able to generate specific sizes of the avatar within the PHP script. At this time, I have the variable $baseImage, which is an image generated using the GD script below:
$baseImage = imagecreatefrompng($startAsset);
imagealphablending($baseImage, true);
imagesavealpha($baseImage, true);
... combine all images into $base here
header("Content-type: image/png");
imagepng($baseImage);
The size of the image this generates is 350x550 (pixels) and I want to be able to get a smaller size.
I've done research but cannot find a working solution. What built-in PHP GD functions can resize this, retain transparency, and keep the great quality/colors?
There is no way to change the size of an image resource directly. Instead, you need to create a new image of the desired size and use imagecopyresampled to copy from the fullsize image to the resized one.
I'm trying to retrieve large images from a directory outside of the root directory. At the moment I just use "fpassthru", but this loads the image either progressively or interlaced depending on what is was when uploaded.
How do I create a complete copy of an image but convert it to interlaced without losing any quality or detail with PHP?
If you use the GD libraries that come with PHP, you can use imageinterlace to accomplish this.
Here's from the example:
<?php
// Create an image instance
$im = imagecreatefromgif('php.gif');
// Enable interlancing
imageinterlace($im, true);
// Save the interlaced image
imagegif($im, './php_interlaced.gif');
imagedestroy($im);
?>
Alternately, you could use ImageMagick.
I was doing some image editing with PHP, since GD provides less functionalities, I switched to Imagick.
One of the processes is to greyscale images. Everything went fine (locally on Windows 7, Imagick 2.2.1-dev 6.5.8-7 Q16) till I uploaded the script to my web hosting server (Linux, Imagick 3.0.1, 6.2.8, 2010-10-20, Q16).
I'v tried to change the quality, but it didn't improve anything.
$img->setImageCompression(imagick::COMPRESSION_JPEG);
$img->setImageCompressionQuality(100);
Here is the results from GD, Imagick and Photoshop
I believe something's wrong with version 3.0.1. Can someone please confirm that?
Q1: Is there an alternative way to convert an image to greyscale with Imagick?
Q2: Is it possible to convert a GD resource to Imagick? So I can use imagefilter($img, IMG_FILTER_GRAYSCALE); to get the correct result and then output with Imagick.
ps: For Q2, you might suggest me to just use GD to process the image. But the problem is that imagejpeg() cannot save images with resolution preserved. and that is actually the reason I switched to Imagick.
This is my preferred way to make a B&W photo in php/imagick: $im = $im->fxImage('intensity');
That applies a function to the image, where intensity is equal to 0.299*red+0.587*green+0.114*blue.
That formula is based on how our eyes are more sensitive to different colours, and as such the difference between that and a "flat" grayscale image really is night and day.
More details here:
http://php.net/manual/en/imagick.fximage.php
http://www.imagemagick.org/script/fx.php
function ImagickToGD($imagick){
$tmpfile = tmpfile();
$imagick->writeImage($tmpfile);
return imagecreatefromstring(file_get_contents($tmpfile));
}
Note that this function does not do any cleanup (except the temp file, which PHP cleans automatically).
So, for example, your code should look like:
$img = new Imagick();
// ...
$gd = ImagickToGD($img);
unset($img); // destroy imagick
imagefilter($gd, IMG_FILTER_GRAYSCALE);
imagejpeg($gd, $target_name, 100);
imagedestroy($gd);
Also, I did not understand the part about "preserving resolution". There is nothing in these operations relating to resolution. My guess is you meant compression? If you want full quality (ie, no compression) simply use 100 as compression value (as I did).
This results in maintaining the existing quality, since opening an image of 70% quality and saving it back with 70% quality actually decreases the final quality by 49% (70% of 70%).
function GDToImagickTo($gd){
$tmpfile = tmpfile();
imagepng($tmpfile); // Png is our best image deal:
// lossless compression, transparency etc..
$imagick = new Imagick()
$imagick->readImage($tmpfile);
return $imagick;
}
Refer this website and check out the image Magick operators found here www.rubblewebs.co.uk/imagemagick/
Also go with www.fmwconcepts.com/imagemagick/ you will find some examples out here...
You can use the image class what you prefer and then use the method readImageBlob to send it to the imagick http://www.php.net/manual/en/imagick.readimageblob.php
I am looking to add a background to images that users upload that are not square. So if they upload a tall and skinny photo I want to add a white background to the sides of the image to make the resulting image have an aspect ratio of 1:1. Is this possible using PHP or javascript?
You can use the GD library for what, with a library called Wideimage it's a breeze:
$image = WideImage::load('img_form_field_name');
$size = max($image->getHeight(), $image->getWidth());
$white = $image->allocateColor(255, 255, 255);
$image->resizeCanvas($size, $size, 'center', 'center', $white);
See the documentation and examples, many functions can even be tested interactively.
The GD library is the most commonly used image manipulation package. It's a set of functions often installed with PHP which handle image manipulation.
What you'll want to do is either scale and crop your image to a specific aspect ratio so that you place your image on a square canvas and cut off whatever does fit or
You'll want to simply resize your image to a fixed aspect ratio and place it on a square canvas with whitespace around it.
Either way, this tutorial should point you in the right direction
http://return-true.com/2009/02/making-cropping-thumbnails-square-using-php-gd/
Yep you'll want to look into either the GD library or ImageMagik. There are plenty of tutorials available for this task.
Functions like imagecreatetruecolor() etc will allow you to create a new image, and then stack the uploaded image on top of it and save it as a new file.
Yes.
http://www.php.net/manual/en/refs.utilspec.image.php