GD library |Terms ||PHP

GD library used to working with images.Create new,modify etc

Palette Images. 8 bits ,256 colors

Grayscale: 16 bit

truecolor: 24bit

FUNCTIONS

<?php
//CREATE IMAGE

imagecreate(width, height);	//create new image
	$image=imagecreate(500, 600);
imagecreatetruecolor(width, height);	//same as imagecreate but it will produce high quality images
	$image=imagecreatetruecolor(500, 600);

//LOAD IMAGES

imagecreatefrompng('stamp.png'); //LOAD PNG IMAGE
imagecreatefromjpeg('uos.jpg'); //LOAD JPG IMAGE

//COLORS 

imagecolorallocate(image, red, green, blue); //return color in rgb then we can use it
	$bg=imagecolorallocate($image, 11, 22, 33);
	imagefill($image, 0, 0, $bg);  

imagecolorallocatealpha(image, red, green, blue, alpha);  //draw transperent color alpha has (0-127) where 127 is complete transparent

imagecolorat(image, x, y);// return color pixel at x,y
	

$result=imagecolorclosest($image, 11, 22, 222);
	$result = imagecolorsforindex($image, $result); 
	$result = "({$result['red']}, {$result['green']}, {$result['blue']})";
  	print_r($result);

//DRAW TEXT OR SHAPES 

imagefill(image, x, y, color);	//fill image with given color

imagefilledarc(image, x_cordinate_center, y_cordinate_center, width, height, start_in_degree, end_in_degree, color style);	//filled arc create ,styles are IMG_ARC_PIE ;IMG_ARC_CHORD ;IMG_ARC_NOFILL ;IMG_ARC_EDGED
	imagefilledarc($image, 100, 100, 200, 200, 0, 270, 0x12aa44, IMG_ARC_PIE);

imagearc(image, x_cordinate_center, y_cordinate_center, width, height, start_in_degree, end_in_degree, color);	//used to create arc or circle line

imagedashedline(image, x1, y1, x2, y2, color);	//draw a dashed line

imagefilledellipse(image, cx, cy, width, height, color);

imagefilledrectangle(image, x1, y1, x2, y2, color);

bool imagepolygon( $image, $points, $num_points>=3, $color ); //draw a polygon
	$potints= array( 
            150,  50, // Point 1 (x, y) 
            50, 250,  // Point 2 (x, y) 
            250,  250 // Point 3 (x, y) 
        ); 

imagechar(image, font (1-5 builtin), x-cordinate, y-cordinate, charter, color); //used to draw only one charter horizontly, use loop for string
	imagecharup($image,5, 250, 150-10*$i, 'Q', 0x987878);  

imagestring(image, font, x, y, string, color); // draw text horizontly

imagestringup(image, font, x, y, string, color);	//draw font vertically

//UTILS

imagecopy(dst_im, src_im_that_is_fit_on_dest, dst_x, dst_y, src_x, src_y, src_w, src_h)	//use to copy two or more images to 1
	 imagecopy($dest, $src, 0, 0, 0, 0, 500, 300); 

imagecrop ( $image, $rect );
	$img=imagecrop($im, ['x' => 0, 'y' => 0, 'width' => 250, 'height' => 150]);


bool imageflip( $image, $mode );	//IMG_FLIP_HORIZONTAL ;IMG_FLIP_VERTICAL ;IMG_FLIP_BOTH 

bool imagegif( $image [,$to])	//create gif image  $to is used for path if not given raw stream used

bool imagelayereffect( $image, $effect ) //IMG_EFFECT_REPLACE ; IMG_EFFECT_ALPHABLEND ;IMG_EFFECT_NORMAL ; IMG_EFFECT_OVERLAY; IMG_EFFECT_MULTIPLY

imagetruecolortopalette(image, dither:true_or_flase, maxNoOfColors);	//convert true color image to pallete

bool imagesetthickness( $image, $thicknessInPixels );	//thickness for lines ie rectangle lines, polygon lines etc

imagesx(image);	//size of image x axis

imagesy(image);	//size of image y axis

imagepng($im,"saveme.png"); //save image
 imagejpeg($img, "test.jpg", 100); //save image + quality 0-100
?>