GD.txt


iptc.org
exif.org  Exchangable Image Files


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PHP Developer's cookbook
CHAPTER -18 - Creating and Managing Images

1. Creating an Image with GD
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<?php
# createimage

header("Content-type: image/gif");
$im = ImageCreate(100.20);

$red = ImageColorAllocate($im, 255, 0, 0);
$white = ImageColorAllocate($im, 255, 255, 255);

ImageString($im, 3, 3, 3, "YES", $white);
ImageGif($im);

ImageDestroy($im); #free memory
?>

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2. Opening a Preexisting Image
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Use the ImageCreate From* functions instead combination of Image Create and Image*.

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3.Gettiung the size of an Image
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You might want to generate width and height for images automatically.
<?php
$image_info = GetImageSize ("someimage.gif"); # returns array of information includinh h and w tags.
list($image_width, $image_height, $image_type,
          $image_width_height_string) = $image_info;
print "<img src='someimage.gif' $image_width_height_string>";

// The third element is type (1 is GIF,2 isJPG, 3 is PND)
// The fouth is string which can be embedded.
?>

JPEG aditionaly returns two elements in associative array.
<?php
$image_info = GetImageSize ("someimage.jpg");
print
print "as well as {$image_info['bits']} bits\n";


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4. Adding Text to Image
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5.Getting the Color of a Certain Part of an Image
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<?php
?>

<?php
?>

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6.Getting the Total Number of Colors in an Image
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<?php
?>

<?php
?>
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7. Making a GIF/PNG Transparent
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<?php
?>

<?php
?>

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8. Copy One Part of an Image to Another image
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<?php
?>

<?php
?>

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9. Drawing Rectangles
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10. Drawing Polygons
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11. Drawing an Arc
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12. Making an Image Interlaced
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<?php
?>
<?php
?>

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13. Dynamic Buttons
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14. Using TrueType Fonts
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