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Getting the Size of An Image (GetImageSize) =========================================== GetImageSize generates a an array of information. Array has four elements. Index/Contents 0/Width of image in pixels. 1/Height 2/flag (type of image, 1-GIF:2-JPEG:3-PNG:4-SWF:5-PSD:6-BMP) 3/a text string in the format "height=ZZZ width=ZZZ" Ex.1 : <?php $size=GetImageSize("trial.png"); foreach($size as $element){ echo $element } ?> Output of the above would be like Width 149 Height 33 Type 3 (PNG - IMAGE) String width="149" height="33" // which can be used as HTML tag.\ The GetImageSize() function is the part of std PHP library you dont need GD Support enabled to use this function. If you pass a jpeg to it , function would return two arrays in associative form. One element "bits" will be no of bits and "channels" no of channels <?php $image_info=GetImageSize("balloon.jpg"); print $image_info['channels']."<br>"; print $image_info['bits']; ?> Generating Color Identifier for an Image (ImageColorAllocate) ============================================================= int imagecolorallocate (int im,int red, int green, int blue) ImageColorAllocate() returns a color identifier representing the color composed of the given RGB components. The im argument is the return from the imagecreate() function. im is the identifire to image. <? $white = ImageColorAllocate ($im, 255, 255, 255); $black = ImageColorAllocate ($im, 0, 0, 0); $red=ImageColorAllocate ($im, 255, 0, 0); ?> Drawing String Inside an Image(ImageString) =========================================== int imagestring (int im, int font, int x, int y, string s, int col) ImageString() draws the string. im :: image identifire s :: string x :: x coordinate y :: y coordinate col :: color font :: font if font is 1,2,3,4,5 built-in font will be used. Returns -1 if the allocation failed. Output an Image to either to browser or to a file (ImagePng) ============================================================ ImagePNG :: Output a PNG image to either the browser or a file int imagepng (int im [, string filename]) The ImagePNG() outputs a GD image stream (im) in PNG format to standard output (usually the browser) or, if a filename is given by the filename it outputs the image to the file. Destroying Image Indetifier to Free Memory (ImageDestroy) ========================================================= int imagedestroy (int im) ImageDestroy() frees any memory associated with image im. Creating an Image (ImageCreate) =============================== Create an image with GD int imagecreate (int x_size, int y_size) imagecreate returns an image identifier. Ex. <? // print the header telling the web browser that its a png image header ("Content-type: image/png",false); // Create an image width 200 and height 30 pixels $im=imagecreate(200,30) or die("Can not initialize GD Stream"); // BackGround Color of the image $bgcolor=ImageColorAllocate($im,255,0,0); // text color of the image $textcolor=ImageColorAllocate($im,255,255,255); //write string to image // 5 : font , 1 : x , 5 : y imagestring($im,5,1,5,"http://www.netrpx.com",$textcolor); imagepng($im); // output to browser //imagepng($im,"trial1.png"); output to file imagedestroy($im); // Frees Memory ?> Making an image transparent( ImageColorTransparent) =================================================== You can make an image transparent using ImageColorTransparent function ImageColorTransparent(im,color) Drawing an ARC(ImageArc ) ========================= imagearc generates a partial ellipse. int imagearc (int im, int cx, int cy, int w, int h, int s, int e,int col) im :: arc to image im cx :: X position cy :: Y position w :: width h :: height s :: start angle e :: end angle col :: color <? header ("Content-type: image/png"); $im=imagecreate(200,100); $white=imagecolorallocate($im,255,255,255); imagecolortransparent($im,$white); // Making Image Transparent $lightblue=imagecolorallocate($im,20,93,233); imagearc($im,0,0,199,95,10,180,$lightblue); imagepng($im); imagedestroy($im); ?> ImageArc function can also be used for drawing Circle and ellipse. Ellipse :::: Start angle 0, End Angle 360 , height and width should not be the same imagearc($im,90,50,150,90,0,360,$lightblue); Circle :::: Start angle 0, End Angle 360 , height and width should be equal imagearc($im,50,50,90,90,0,360,$lightblue); Filling border of Image created by ImageArc Function (Image fill to border) =========================================================================== int imagefilltoborder (int im, int x, int y, int border, int col) ImageFillToBorder() performs a flood fill whose border color is defined by border. The starting point for the fill is x, y (top left is 0, 0) and the region is filled with color col. Add following line below imagearcfunction you have written above imagefilltoborder ($im,50,50,$lightblue,$lightblue); opning a pre-existing Image( ImageCreateFrompng) ================================================ ImageCreateFromPNG() returns an image identifier representing the image obtained from the given filename.ImageCreateFromPNG() returns an empty string on failure. <? /*// Opening an Pre-Existing Image header ("Content-type: image/png"); $img_png=ImageCreateFromPng("trial.png"); if ($img_png==" "){ echo "Error !!! could not open trial.png"; exit;} $tc=ImageColorAllocate($img_png,0,4,232); ImageString($img_png,5,5,5,"WWW.NETRPX.COM",$tc); ImagePng($img_png);*/ ?> Drawing Rectangles (ImageRectangle ::: ImageFilledRectangle) ============================================================ int imagerectangle (int im, int x1, int y1, int x2, int y2, int col) ImageRectangle() creates a rectangle of color col in image im starting at upper left coordinate x1, y1 and ending at bottom right coordinate x2, y2. (0, 0 is the top left corner of the image). <? header ("Content-type: image/png"); $im=imagecreate(500,100); $white=imagecolorallocate($im,255,255,255); $lightblue=imagecolorallocate($im,20,93,233); ImageRectangle($im,0,0,90,50,$lightblue); imagepng($im); imagedestroy($im); ?> to create a filled rectangle use ImageFilledRectangle function. In the above code replace ImageRectangle function with ImageFilledRectangle Function ImageFilledRectangle($im,0,0,90,50,$lightblue); Above function can also be used to draw lines. Generally line is a rectangle with nonexistent with but in real word it sould be one pixel wide ImageFilledRectangle($im,0,0,90,1,$lightblue);. Getting the total no. of Colors in an image (ImageColorsTotal) ============================================================== ImageColorsTotal(file indetifier) This returns the number of colors in the specified image's palette. header ("Content-type: image/png"); $im=ImageCreateFromPng("trial.png"); echo "No of colors in image : " . ImageColorsTotal($im); ImageDestroy($im); Getting Color of a Certain path of an Image ( ImageColorAt, ImageColorsForIndex ) ================================================================================= ImageColorAt int imagecolorat (int im, int x, int y) Returns the index of the color of the pixel at the specified location in the image. ImageColorsForIndex array imagecolorsforindex (int im, int index) This returns an associative array with red, green, and blue keys that contain the appropriate values for the specified color index. <? header ("Content-type: image/png"); $im=ImageCreateFromPng("trial.png"); $indexis=ImageColorAt($im,5,8); // color index of image at x=5,y=8 $rgbarray=ImageColorsForIndex($im,$indexis); // associative array of red,green,blue echo "Green : " . $rgbarray['green']; echo " Blue : " . $rgbarray['blue'] ; echo " Red : " . $rgbarray['red'] ; ?> Drawing Polygons (ImagePolygon) =============================== int imagepolygon (int im, array points, int num_points, int col) ImagePolygon() creates a polygon in image id. Points is a PHP array containing the polygon's vertices. Num_points is the total number of vertices. <? header ("Content-type: image/png"); $im=imagecreate(500,100); $white=imagecolorallocate($im,255,255,255); $lightblue=imagecolorallocate($im,20,93,233); $points=array(10,16,12,70,20,50,80,30); // Eight points for four vertices ImagePolygon($im,$points,4,$lightblue); // draw ploygon ImagePng($im); ImageDestroy($im); ?> To create a filled polygon use ImageFilledPolygon Function <? ImageFilledPolygon($im,$points,4,$lightblue); ?> | |||||
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