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14 Image Alter
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The PHP GD library is so powerful that it can perform a variety of image manipulations you would normally only find in a graphics program In fact, you could probably build quite an advanced image editor using them This plug-in goes someway towards that by providing
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Image Handling
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This photograph has been modi ed by passing it through the Image Alter plug-in
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14 different image transformations you can apply to your graphics, and Figure 4-4 shows just one of these, Edge Detect, in use
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About the Plug-in
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This plug-in accepts an image to be converted, along with the transformation required It takes these arguments:
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$image A GD image to be transformed $effect The transformation to apply, between 1 and 14:
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$effect 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Action Sharpen Blur Brighten Darken Increase contrast Decrease contrast Grayscale Invert Increase red Increase green Increase blue Edge detect Emboss Sketchify
Plug-in PHP: 100 Power Solutions
Variables, Arrays, and Functions
None
How It Works
To select between the available transformation effects, the plug-in uses a large switch statement that supports 14 different cases to apply to the supplied GD image object It then calls the relevant function with the required parameters and returns the new image
How to Use It
To perform an Edge Detect transformation on a file called photojpg, as shown in Figure 4-4, you could use the following code, which will load a GD image object using the imagecreatefromjpeg() function, and save the transformed image with the function imagejpeg(), using the filename photo2jpg:
$image = imagecreatefromjpeg("photojpg"); $copy = PIPHP_ImageAlter($image, 12); imagejpeg($copy, "photo2jpg");
Or to output the transformed image directly to a browser, you could use the following code to output the correct header first:
$image = imagecreatefromjpeg("photojpg"); header("Content-type: image/jpeg"); imagejpeg(PIPHP_ImageAlter($image, 12));
The Plug-in
function PIPHP_ImageAlter($image, $effect) { switch($effect) { case 1: imageconvolution($image, array(array(-1, -1, -1), array(-1, 16, -1), array(-1, -1, -1)), 8, 0); break; case 2: imagefilter($image, IMG_FILTER_GAUSSIAN_BLUR); break; case 3: imagefilter($image, IMG_FILTER_BRIGHTNESS, 20); break; case 4: imagefilter($image, IMG_FILTER_BRIGHTNESS, -20); break; case 5: imagefilter($image, IMG_FILTER_CONTRAST, -20); break; case 6: imagefilter($image, IMG_FILTER_CONTRAST, 20); break; case 7: imagefilter($image, IMG_FILTER_GRAYSCALE); break; case 8: imagefilter($image, IMG_FILTER_NEGATE); break; case 9: imagefilter($image, IMG_FILTER_COLORIZE, 128, 0, 0, 50); break;
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Image Handling
case 10: imagefilter($image, IMG_FILTER_COLORIZE, 0, 128, 0, 50); break; case 11: imagefilter($image, IMG_FILTER_COLORIZE, 0, 0, 128, 50); break; case 12: imagefilter($image, IMG_FILTER_EDGEDETECT); break; case 13: imagefilter($image, IMG_FILTER_EMBOSS); break; case 14: imagefilter($image, IMG_FILTER_MEAN_REMOVAL); break; } return $image; }
15 Image Crop
This plug-in lets you crop a portion from an image by passing it as a GD image object, along with the top-left x and y coordinates, and the width and height to crop Figure 4-5 shows a 285 214 pixel image, which has been cropped starting 100 pixels in from the left and 0 pixels from the top, with dimensions of 110 140 pixels
About the Plug-in
This plug-in accepts a GD image from which a portion is to be cropped, along with details about the crop offset and dimensions If any arguments are out of the image bounds, then FALSE is returned It takes these arguments:
$image A GD image to be transformed $x Offset from the left of the image
FIGURE 4-5
Images are easily cut down to size using the Image Crop plug-in
Plug-in PHP: 100 Power Solutions
$y Offset from the top of the image $w The width to crop $h The height to crop
Variables, Arrays, and Functions
$temp $tw $th GD image copy of the cropped image Integer containing the width of the passed image Integer containing the height of the passed image
How It Works
This plug-in works by creating a new GD image object of the dimensions supplied in $w and $h using the imagecreatetruecolor() function This blank image is stored in $temp Then, the imagecopyresampled() function is called, passing the required arguments to copy a portion of the image supplied in $image, starting at the offset $x pixels in and $y pixels down (and with a width and height of $w by $h), into the image held in $temp, which is then returned
How to Use It
To crop a section out of an image, you need to first place the image in a GD image object and then call the PIPHP_ImageCrop() function with the required parameters, like this:
$image = imagecreatefromjpeg("photojpg"); $copy = PIPHP_ImageCrop($image, 100, 0, 110, 140); if (!$copy) echo "Crop failed: Argument(s) out of bounds"; else imagejpeg($copy, "photo1jpg");
This code creates a GD image object in $image by loading it in from the file photo jpg using the imagecreatefromjpeg() function Then, the plug-in is called with the top-left corner of the crop and the dimensions to use, the returned result of which is assigned to $copy The cropped image is then saved as the file photo1jpg using the imagejpeg() function Note that arguments passed with values outside the image bounds will result in FALSE being returned so you can check for this and issue an appropriate message To output the resulting cropped image to a browser, you can use the following code instead, which as long as there wasn t an error, first sends the correct header:
$image = imagecreatefromjpeg("photojpg"); $copy = PIPHP_ImageCrop($image, 100, 0, 110, 140); if ($copy != FALSE) { header("Content-type: image/jpeg"); imagejpeg(); }
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